Source: https://talapinlab.uchicago.edu/page/publications
Timestamp: 2019-04-18 22:33:52+00:00

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I. Coropceanu, M. A. Boles, D. V. Talapin. J. Am. Chem. Soc. 2019, Article ASAP.
The self-assembly of two sizes of spherical nanocrystals has revealed a surprisingly diverse library of structures. To date, at least 15 distinct binary nanocrystal superlattice (BNSL) structures have been identified. The stability of these binary phases cannot be fully explained using the traditional conceptual framework treating the assembly process as entropy-driven crystallization of rigid spherical particles. Such deviation from hard sphere behavior may be explained by the soft and deformable layer of ligands that envelops the nanocrystals, which contributes significantly to the overall size and shape of assembling particles. In this work, we describe a set of experiments designed to elucidate the role of the ligand corona in shaping the thermodynamics and kinetics of BNSL assembly. Using hydrocarbon-capped Au and PbS nanocrystals as a model binary system, we systematically tuned the core radius (R) and ligand chain length (L) of particles and subsequently assembled them into binary superlattices. The resulting database of binary structures enabled a detailed analysis of the role of effective nanocrystal size ratio, as well as softness expressed as L/R, in directing the assembly of binary structures. This catalog of superlattices allowed us to not only study the frequency of different phases but to also systematically measure the geometric parameters of the BNSLs. This analysis allowed us to evaluate new theoretical models treating the cocrystallization of deformable spheres and to formulate new hypotheses about the factors affecting the nucleation and growth of the binary superlattices. Among other insights, our results suggest that the relative abundance of the binary phases observed may be explained not only by considerations of thermodynamic stability, but also by a postulated preordering of the binary fluid into local structures with icosahedral or polytetrahedral symmetry prior to nucleation.
N. B. Ludwig, K. Dasbiswas, D. V. Talapin, S. Vaikuntanathan. J. Chem. Phys. 2018, 149, 164505.
Charge correlations in dense ionic fluids give rise to novel effects such as long-range screening and colloidal stabilization which are not predicted by the classic Debye–Hückel theory. We show that a Coulomb or charge-frustrated Ising model, which accounts for both long-range Coulomb and short-range molecular interactions, simply describes some of these ionic correlations. In particular, we obtain, at a mean field level and in simulations, a non-monotonic dependence of the screening length on the temperature. Using a combination of simulations and mean field theories, we study how the correlations in the various regimes are affected by the strength of the short ranged interactions.
E. M. Janke, N. E. Williams, C. She, D. Zherebetskyy, M. Hudson, L. Wang, D. J. Gosztola, R. D. Schaller, B. Lee, C. Sun, G. S. Engel, D. V. Talapin. J. Am. Chem. Soc. 2018, 140, 15791.
The ensemble emission spectra of colloidal InP quantum dots are broader than achievable spectra of cadmium- and lead-based quantum dots, despite similar single-particle line widths and significant efforts invested in the improvement of synthetic protocols. We seek to explain the origin of persistently broad ensemble emission spectra of colloidal InP quantum dots by investigating the nature of the electronic states responsible for luminescence. We identify a correlation between red-shifted emission spectra and anomalous broadening of the excitation spectra of luminescent InP colloids, suggesting a trap-associated emission pathway in highly emissive core–shell quantum dots. Time-resolved pump–probe experiments find that electrons are largely untrapped on photoluminescence relevant time scales pointing to emission from recombination of localized holes with free electrons. Two-dimensional electronic spectroscopy on InP quantum dots reveals multiple emissive states and increased electron–phonon coupling associated with hole localization. These localized hole states near the valence band edge are hypothesized to arise from incomplete surface passivation and structural disorder associated with lattice defects. We confirm the presence and effect of lattice disorder by X-ray absorption spectroscopy and Raman scattering measurements. Participation of localized electronic states that are associated with various classes of lattice defects gives rise to phonon-coupled defect related emission. These findings explain the origins of the persistently broad emission spectra of colloidal InP quantum dots and suggest future strategies to narrow ensemble emission lines comparable to what is observed for cadmium-based materials.
W. Cho, S. Kim, I. Coropceanu, V. Srivastava, B. T. Diroll, A. Hazarika, I. Fedin, R. D. Schaller, G. Galli, D. V. Talapin. Chem. Mater. 2018, 30, 6957.
B. T. Diroll, W. Cho, I. Coropceanu, S. Harvey, A. Brumberg, N. Holtgrewe, S. A. Crooker, M. R. Wasielewski, V. B. Prakapenka, D. V. Talapin, R. D. Schaller. Nano Lett. 2018, 18, 6948.
Excimers, a portmanteau of “excited dimer”, are transient species that are formed from the electronic interaction of a fluorophore in the excited state with a neighbor in the ground state, which have found extensive use as laser gain media. Although common in molecular fluorophores, this work presents evidence for the formation of excimers in a new class of materials: atomically precise two-dimensional semiconductor nanoplatelets. Colloidal nanoplatelets of CdSe display two-color photoluminescence resolved at low temperatures with one band attributed to band-edge fluorescence and a second, red band attributed to excimer fluorescence. Previously reasonable explanations for two-color fluorescence, such as charging, are shown to be inconsistent with additional evidence. As with excimers in other materials systems, excimer emission is increased by increasing nanoplatelet concentration and the degree of cofacial stacking. Consistent with their promise as low-threshold gain media, amplified spontaneous emission emerges from the excimer emission line.
V. Srivastava, V. Kamysbayev, L. Hong, E. Dunietz, R. F. Klie, D. V. Talapin. J. Am. Chem. Soc. 2018, 140, 12144.
Control of composition, stoichiometry, and defects in colloidal quantum dots (QDs) of III–V semiconductors has proven to be difficult due to their covalent character. Whereas the synthesis of colloidal indium pnictides such as InP, InAs, and InSb has made significant progress, gallium-containing colloidal III–V QDs still remain largely elusive. Gallium pnictides represent an important class of semiconductors due to their excellent optoelectronic properties in the bulk; however, the difficulty with the synthesis of gallium-containing colloidal III–V QDs has largely prohibited their exploration as solution-processed semiconductors. Here we introduce molten inorganic salts as high-temperature solvents for the synthesis and manipulation of III–V QDs. We demonstrate cation exchange reactions on presynthesized InP and InAs QDs to form In1–xGaxP and In1–xGaxAs QDs at temperatures above 380 °C. This approach produces novel ternary alloy QDs with controllable compositions that show size- and composition-dependent absorption and emission features. Emission quantum yields of up to ∼50% can be obtained for In1–xGaxP/ZnS core–shell QDs. A comparison of the optical properties of InP/ZnS core–shells with In1–xGaxP/ZnS core–shells reveals that Ga incorporation leads to significant improvement in the optical properties of III–V/II–VI core–shell emitters which is of great importance for quantum dot-based lighting and display applications. This work also demonstrates the potential of molten inorganic salts as versatile solvents for the synthesis and processing of colloidal nanomaterials at temperatures inaccessible for traditional solvents.
M. H. Hudson, M. Chen, V. Kamysbayev, E. M. Janke, X. Lan, G. Allan, C. Delerue, B. Lee, P. Guyot-Sionnest, D. V. Talapin. ACS Nano 2018, 12, 9397.
HgTe colloidal quantum dots (QDs) are of interest because quantum confinement of semimetallic bulk HgTe allows one to synthetically control the bandgap throughout the infrared. Here, we synthesize highly monodisperse HgTe QDs and tune their doping both chemically and electrochemically. The monodispersity of the QDs was evaluated using small-angle X-ray scattering (SAXS) and suggests a diameter distribution of ∼10% across multiple batches of different sizes. Electron-doped HgTe QDs display an intraband absorbance and bleaching of the first two excitonic features. We see splitting of the intraband peaks corresponding to electronic transitions from the occupied 1Se state to a series of nondegenerate 1Pe states. Spectroelectrochemical studies reveal that the degree of splitting and relative intensity of the intraband features remain constant across doping levels up to two electrons per QD. Theoretical modeling suggests that the splitting of the 1Pe level arises from spin–orbit coupling and reduced QD symmetry. The fine structure of the intraband transitions is observed in the ensemble studies due to the size uniformity of the as-synthesized QDs and strong spin–orbit coupling inherent to HgTe.
X. Ma, B. T. Diroll, W. Cho, I. Fedin, R. D. Schaller, D. V. Talapin, and G. P. Wiederrecht. Nano Lett. 2018, 18, 4647.
Many important light-matter coupling and energy-transfer processes depend critically on the dimensionality and orientation of optical transition dipoles in emitters. We investigate individual quasi-two-dimensional nanoplatelets (NPLs) using higher-order laser scanning microscopy and find that absorption dipoles in NPLs are isotropic in three dimensions at the excitation wavelength. Correlated polarization studies of the NPLs reveal that their emission polarization is strongly dependent on the aspect ratio of the lateral dimensions. Our simulations reveal that this emission anisotropy can be readily explained by the electric field renormalization effect caused by the dielectric contrast between the NPLs and the surrounding medium, and we conclude that emission dipoles in NPLs are isotropic in the plane of the NPLs. Our study presents an approach for disentangling the effects of dipole degeneracy and electric field renormalization on emission anisotropy and can be adapted for studying the intrinsic optical transition dipoles of various nanostructures.
E. Scalise, V. Srivastava, E. M. Janke, D. Talapin, G. Galli, and S. Wippermann. Nature Nanotech. 2018, 33, 841.
V. Srivastava, E. Dunietz, V. Kamysbayev, J. S. Anderson, and D. V. Talapin. Chem. Mater. 2018, 30, 3623.
C. E. Rowland, I. Fedin, B. T. Diroll, Y. Liu, D. V. Talapin, and R. D. Schaller. J. Phys. Chem. Lett. 2018, 9, 286.
Elevated temperature optoelectronic performance of semiconductor nanomaterials remains an important issue for applications. Here we examine 2D CdSe nanoplatelets (NPs) and CdS/CdSe/CdS shell/core/shell sandwich NPs at temperatures ranging from 300 to 700 K using static and transient spectroscopies as well as in situ transmission electron microscopy. NPs exhibit reversible changes in PL intensity, spectral position, and emission line width with temperature elevation up to ∼500 K, losing a factor of ∼8 to 10 in PL intensity at 400 K relative to ambient. Temperature elevation above ∼500 K yields thickness-dependent, irreversible degradation in optical properties. Electron microscopy relates stability of the core-only NP morphology up to 555 and 600 K for the four and five monolayer NPs, respectively, followed by sintering and evaporation at still higher temperatures. Reversible PL loss, based on differences in decay dynamics between time-resolved photoluminescence and transient absorption, results primarily from hole trapping in both NPs and sandwich NPs.
M. Pelton, J. J. Andrews, I. Fedin, D. V. Talapin, H. Leng, and S. K. O’Leary. Nano Lett. 2017, 17, 6900.
Nonradiative Auger recombination limits the efficiency with which colloidal semiconductor nanocrystals can emit light when they are subjected to strong excitation, with important implications for the application of the nanocrystals in light-emitting diodes and lasers. This has motivated attempts to engineer the structure of the nanocrystals to minimize Auger rates. Here, we study Auger recombination rates in CdSe/CdS core/shell nanoplatelets, or colloidal quantum wells. Using time-resolved photoluminescence measurements, we show that the rate of biexcitonic Auger recombination has a nonmonotonic dependence on the shell thickness, initially decreasing, reaching a minimum for shells with thickness of 2–4 monolayers, and then increasing with further increases in the shell thickness. This nonmonotonic behavior has not been observed previously for biexcitonic recombination in quantum dots, most likely due to inhomogeneous broadening that is not present for the nanoplatelets.
X. Ma, B. T. Diroll, W. Cho, I. Fedin, R. D. Schaller, D. V. Talapin, S. K. Gray, G. P. Wiederrecht, and D. J. Gosztola. ACS Nano 2017, 11, 9119.
Quasi-two-dimensional nanoplatelets (NPLs) possess fundamentally different excitonic properties from zero-dimensional quantum dots. We study lateral size-dependent photon emission statistics and carrier dynamics of individual NPLs using second-order photon correlation (g(2)(τ)) spectroscopy and photoluminescence (PL) intensity-dependent lifetime analysis. Room-temperature radiative lifetimes of NPLs can be derived from maximum PL intensity periods in PL time traces. It first decreases with NPL lateral size and then stays constant, deviating from the electric dipole approximation. Analysis of the PL time traces further reveals that the single exciton quantum yield in NPLs decreases with NPL lateral size and increases with protecting shell thickness, indicating the importance of surface passivation on NPL emission quality. Second-order photon correlation (g(2)(τ)) studies of single NPLs show that the biexciton quantum yield is strongly dependent on the lateral size and single exciton quantum yield of the NPLs. In large NPLs with unity single exciton quantum yield, the corresponding biexciton quantum yield can reach unity. These findings reveal that by careful growth control and core–shell material engineering, NPLs can be of great potential for light amplification and integrated quantum photonic applications.
Y. Wang, I. Fedin, H. Zhang, and D. V. Talapin. Science 2017, 357, 385.
Perspective - M. Striccoli. Photolithography based on nanocrystals. Science 2017, 357, 353.
Photolithography is an important manufacturing process that relies on using photoresists, typically polymer formulations, that change solubility when illuminated with ultraviolet light. Here, we introduce a general chemical approach for photoresist-free, direct optical lithography of functional inorganic nanomaterials. The patterned materials can be metals, semiconductors, oxides, magnetic, or rare earth compositions. No organic impurities are present in the patterned layers, which helps achieve good electronic and optical properties. The conductivity, carrier mobility, dielectric, and luminescence properties of optically patterned layers are on par with the properties of state-of-the-art solution-processed materials. The ability to directly pattern all-inorganic layers by using a light exposure dose comparable with that of organic photoresists provides an alternate route for thin-film device manufacturing.
Z. Yang, M. Pelton, I. Fedin, D. V. Talapin, and E. Waks. Nat. Commun. 2017, 8, 143.
Colloidal semiconductor nanocrystals have emerged as promising active materials for solution-processable optoelectronic and light-emitting devices. In particular, the development of nanocrystal lasers is currently experiencing rapid progress. However, these lasers require large pump powers, and realizing an efficient low-power nanocrystal laser has remained a difficult challenge. Here, we demonstrate a nanolaser using colloidal nanocrystals that exhibits a threshold input power of less than 1 μW, a very low threshold for any laser using colloidal emitters. We use CdSe/CdS core-shell nanoplatelets, which are efficient nanocrystal emitters with the electronic structure of quantum wells, coupled to a photonic-crystal nanobeam cavity that attains high coupling efficiencies. The device achieves stable continuous-wave lasing at room temperature, which is essential for many photonic and optoelectronic applications. Our results show that colloidal nanocrystals are suitable for compact and efficient optoelectronic devices based on versatile and inexpensive solution-processable materials.
H. Zhang, J. S. Son, D. S. Dolzhnikov, A. S. Filatov, A. Hazarika, Y. Wang, M. H. Hudson, C.-J. Sun, S. Chattopadhyay, and D. V. Talapin. Chem. Mater. 2017, 29, 6396.
Here we report the syntheses of largely unexplored lead and bismuth chalcogenidometallates in the solution phase. Using N2H4 as the solvent, new compounds such as K6Pb3Te6·7N2H4 were obtained. These soluble molecular compounds underwent cation exchange processes using resin chemistry, replacing Na+ or K+ by decomposable N2H5+ or tetraethylammonium cations. They also transformed into stoichiometric lead and bismuth chalcogenide nanomaterials with the addition of metal salts. Such a versatile chemistry led to a variety of composition-matched solders to join lead and bismuth chalcogenides and tune their charge transport properties at the grain boundaries. Solution-processed thin films composed of Bi0.5Sb1.5Te3 microparticles soldered by (N2H5)6Bi0.5Sb1.5Te6 exhibited thermoelectric power factors (∼28 μW/cm K2) comparable to those in vacuum-deposited Bi0.5Sb1.5Te3 films. The soldering effect can also be integrated with attractive fabrication techniques for thermoelectric modules, such as screen printing, suggesting the potential of these solders in the rational design of printable and moldable thermoelectrics.
A. J. S. Valentine, D. V. Talapin, and D. A. Mazziotti. J. Phys. Chem. A 2017, 121, 3142.
Recent work found that soldering CdTe quantum dots together with a molecular CdTe polymer yielded field-effect transistors with much greater electron mobility than quantum dots alone. We present a computational study of the CdTe polymer using the active-space variational two-electron reduced density matrix (2-RDM) method. While analogous complete active-space self-consistent field (CASSCF) methods scale exponentially with the number of active orbitals, the active-space variational 2-RDM method exhibits polynomial scaling. A CASSCF calculation using the (48o,64e) active space studied in this paper requires 1024 determinants and is therefore intractable, while the variational 2-RDM method in the same active space requires only 2.1 × 107 variables. Natural orbitals, natural-orbital occupations, charge gaps, and Mulliken charges are reported as a function of polymer length. The polymer, we find, is strongly correlated, despite possessing a simple sp3-hybridized bonding scheme. Calculations reveal the formation of a nearly saturated valence band as the polymer grows and a charge gap that decreases sharply with polymer length.
H. Zhang, K. Dasbiswas, N. B. Ludwig, G. Han, B. Lee, S. Vaikuntanathan, and D. V. Talapin. Nature 2017, 542, 328.
A colloidal solution is a homogeneous dispersion of particles or droplets of one phase (solute) in a second, typically liquid, phase (solvent). Colloids are ubiquitous in biological, chemical and technological processes, homogenizing highly dissimilar constituents. To stabilize a colloidal system against coalescence and aggregation, the surface of each solute particle is engineered to impose repulsive forces strong enough to overpower van der Waals attraction and keep the particles separated from each other. Electrostatic stabilization of charged solutes works well in solvents with high dielectric constants, such as water (dielectric constant of 80). In contrast, colloidal stabilization in solvents with low polarity, such as hexane (dielectric constant of about 2), can be achieved by decorating the surface of each particle of the solute with molecules (surfactants) containing flexible, brush-like chains. Here we report a class of colloidal systems in which solute particles (including metals, semiconductors and magnetic materials) form stable colloids in various molten inorganic salts. The stability of such colloids cannot be explained by traditional electrostatic and steric mechanisms. Screening of many solute–solvent combinations shows that colloidal stability can be traced to the strength of chemical bonding at the solute–solvent interface. Theoretical analysis and molecular dynamics modelling suggest that a layer of surface-bound solvent ions produces long-ranged charge-density oscillations in the molten salt around solute particles, preventing their aggregation. Colloids composed of inorganic particles in inorganic melts offer opportunities for introducing colloidal techniques to solid-state science and engineering applications.
V. Srivastava, W. Liu, E. M. Janke, V. Kamysbayev, A. S. Filatov, C. Sun, B. Lee, Tijana Rajh, R. D. Schaller, and D. V. Talapin. Nano Lett. 2017, 17, 2094.
GaAs is one of the most important semiconductors. However, colloidal GaAs nanocrystals remain largely unexplored because of the difficulties with their synthesis. Traditional synthetic routes either fail to produce pure GaAs phase or result in materials whose optical properties are very different from the behavior expected for quantum dots of direct-gap semiconductors. In this work, we demonstrate a variety of synthetic routes toward crystalline GaAs NCs. By using a combination of Raman, EXAFS, transient absorption, and EPR spectroscopies, we conclude that unusual optical properties of colloidal GaAs NCs can be related to the presence of Ga vacancies and lattice disorder. These defects do not manifest themselves in TEM images and powder X-ray diffraction patterns but are responsible for the lack of absorption features even in apparently crystalline GaAs nanoparticles. We introduce a novel molten salt based annealing approach to alleviate these structural defects and show the emergence of size-dependent excitonic transitions in colloidal GaAs quantum dots.
B. T. Diroll, D. V. Talapin, and R. D. Schaller. ACS Photonics 2017, 4, 576.
Amplified spontaneous emission (ASE) and lasing from solution-processed materials are demonstrated in the challenging violet-to-blue (430–490 nm) spectral region for colloidal nanoplatelets of CdS and newly synthesized core/shell CdS/ZnS nanoplatelets. Despite modest band-edge photoluminescence quantum yields of 2% or less for single excitons, which we show results from hole trapping, the samples exhibit low ASE thresholds. Furthermore, four-monolayer CdS samples show ASE at shorter wavelengths than any reported film of colloidal quantum-confined material. This work underlines that low quantum yields for single excitons do not necessarily lead to a poor gain medium. The low ASE thresholds originate from negligible dispersion in thickness, large absorption cross sections of 2.8 × 10–14 cm–2, and rather slow (150 to 300 ps) biexciton recombination. We show that under higher-fluence excitation, ASE can kinetically outcompete hole trapping. Using nanoplatelets as the gain medium, lasing is observed in a linear optical cavity. This work confirms the fundamental advantages of colloidal quantum well structures as gain media, even in the absence of high photoluminescence efficiency.
M. H. Hudson, D. S. Dolzhnikov, A. S. Filatov, E. M. Janke, J. Jang, B. Lee, C. Sun, and D. V. Talapin. J. Am. Chem. Soc. 2017, 139, 3368.
R. W. Crisp, G. F. Pach, J. M. Kurley, R. M. France, M. O. Reese, S. U. Nanayakkara, B. A. MacLeod, D. V. Talapin, M. C. Beard, and J. M. Luther. Nano Lett. 2017, 17, 1020.
We developed a monolithic CdTe–PbS tandem solar cell architecture in which both the CdTe and PbS absorber layers are solution-processed from nanocrystal inks. Due to their tunable nature, PbS quantum dots (QDs), with a controllable band gap between 0.4 and ∼1.6 eV, are a promising candidate for a bottom absorber layer in tandem photovoltaics. In the detailed balance limit, the ideal configuration of a CdTe (Eg = 1.5 eV)–PbS tandem structure assumes infinite thickness of the absorber layers and requires the PbS band gap to be 0.75 eV to theoretically achieve a power conversion efficiency (PCE) of 45%. However, modeling shows that by allowing the thickness of the CdTe layer to vary, a tandem with efficiency over 40% is achievable using bottom cell band gaps ranging from 0.68 and 1.16 eV. In a first step toward developing this technology, we explore CdTe–PbS tandem devices by developing a ZnTe–ZnO tunnel junction, which appropriately combines the two subcells in series. We examine the basic characteristics of the solar cells as a function of layer thickness and bottom-cell band gap and demonstrate open-circuit voltages in excess of 1.1 V with matched short circuit current density of 10 mA/cm2 in prototype devices.
J. M. Kurley, M. G. Panthani, R. W. Crisp, S. U. Nanayakkara, G. F. Pach, M. O. Reese, M. H. Hudson, D. S. Dolzhnikov, V. Tanygin, J. M. Luther, and D. V. Talapin. ACS Energy Lett. 2017, 2, 270.
Recently, solution-processing became a viable route for depositing CdTe for use in photovoltaics. Ultrathin (∼500 nm) solar cells have been made using colloidal CdTe nanocrystals with efficiencies exceeding 12% power conversion efficiency (PCE) demonstrated by using very simple device stacks. Further progress requires an effective method for extracting charge carriers generated during light harvesting. Here, we explored solution-based methods for creating transparent Ohmic contacts to the solution-deposited CdTe absorber layer and demonstrated molecular and nanocrystal approaches to Ohmic hole-extracting contacts at the ITO/CdTe interface. We used scanning Kelvin probe microscopy to further show how the above approaches improved carrier collection by reducing the potential drop under reverse bias across the ITO/CdTe interface. Other methods, such as spin-coating CdTe/A2CdTe2 (A = Na, K, Cs, N2H5), can be used in conjunction with current/light soaking to improve PCE further.
D. V. Talapin and E. V. Shevchenko. Chem. Rev. 2016, 116, 10343.
V. Srivastava, E. M. Janke, B. T. Diroll, R. D. Schaller, and D. V. Talapin. Chem. Mater. 2016, 28, 6797.
Synthesis of colloidal nanocrystals (NC) of important arsenide nanomaterials (e.g., InAs, Cd3As2) has been limited by the lack of convenient arsenic precursors. Here we address this constraint by identifying a convenient and commercially available As precursor, tris-dimethylaminoarsine (As(NMe2)3), which can be used to prepare high quality InAs NCs with controlled size distributions. Our approach employs a reaction between InCl3 and As(NMe2)3 using diisobutylaluminum hydride (DIBAL-H) to convert As(NMe2)3 in situ into reactive intermediates AsHx(NMe2)3–x, where x = 1,2,3. NC size can be varied by changing DIBAL-H concentration and growth temperature, with colloidal solutions of InAs showing size dependent absorption and emission features tunable across wavelengths of 750 to 1450 nm. We also show that this approach works well for the colloidal synthesis of Cd3As2 NCs. By circumventing the preparation of notoriously unstable and dangerous arsenic precursors (e.g., AsH3 and As(SiMe3)3), this work improves the synthetic accessibility of arsenide-based NCs and, by extension, the potential of such NCs for use in infrared (IR) applications such as communications, fluorescent labeling and photon detection.
B. Diroll, I. Fedin, P. Darancet, D. V. Talapin, R. Schaller. J. Am. Chem. Soc. 2016, 138, 11109.
We report measurements of electron transfer rates for four isoenergetic donor–acceptor pairs comprising a molecular electron acceptor, methylviologen (MV), and morphology-controlled colloidal semiconductor nanoparticles of CdSe. The four nanoparticles include a spherical quantum dot (QD) and three differing lateral areas of 4-monolayer-thick nanoplatelets (NPLs), each with a 2.42 eV energy gap. As such, the measurements, performed via ultrafast photoluminescence, relate the dependence of charge transfer rate on the spatial extent of the initial electron–hole pair wave function explicitly, which we show for the first time to be related to surface area in this regime that is intermediate between homogeneous and heterogeneous charge transfer as well as 2D to 0D electron transfer. The observed nonlinear dependence of rate with surface area is attributed to exciton delocalization within each structure, which we show via temperature-dependent absorption measurements remains constant.
M. Boles, M. Engel, and D. V. Talapin. Chem. Rev. 2016, 116, 11220.
C. R. Kagan, E. Lifshitz, E. H. Sargent, and D. V. Talapin. Science 2016, 353, 885.
The continued growth of mobile and interactive computing requires devices manufactured with low-cost processes, compatible with large-area and flexible form factors, and with additional functionality. We review recent advances in the design of electronic and optoelectronic devices that use colloidal semiconductor quantum dots (QDs). The properties of materials assembled of QDs may be tailored not only by the atomic composition but also by the size, shape, and surface functionalization of the individual QDs and by the communication among these QDs. The chemical and physical properties of QD surfaces and the interfaces in QD devices are of particular importance, and these enable the solution-based fabrication of low-cost, large-area, flexible, and functional devices. We discuss challenges that must be addressed in the move to solution-processed functional optoelectronic nanomaterials.
I. Fedin and D. V. Talapin. J. Am. Chem. Soc. 2016, 138, 9771.
Semiconductor quantum rings are of great fundamental interest because their non-trivial topology creates novel physical properties. At the same time, toroidal topology is difficult to achieve for colloidal nanocrystals and epitaxially grown semiconductor nanostructures. In this work, we introduce the synthesis of luminescent colloidal CdSe nanorings and nanostructures with double and triple toroidal topology. The nanorings form during controlled etching and rearrangement of two-dimensional nanoplatelets. We discuss a possible mechanism of the transformation of nanoplatelets into nanorings and potential utility of colloidal nanorings for magneto-optical (e.g., Aharonov–Bohm effect) and other applications.
H. Zhang, J. M. Kurley, J. C. Russell, J. Jang, D. V. Talapin. J. Am. Chem. Soc. 2016, 138, 7464.
Solution-processed CdTe solar cells using CdTe nanocrystal (NC) ink may offer an economically viable route for large-scale manufacturing. Here we design a new CdCl3–-capped CdTe NC ink by taking advantage of novel surface chemistry. In this ink, CdCl3– ligands act as surface ligands, sintering promoters, and dopants. Our solution chemistry allows obtaining very thin continuous layers of high-quality CdTe which is challenging for traditional vapor transport methods. Using benign solvents, in air, and without additional CdCl2 treatment, we obtain a well-sintered CdTe absorber layer from the new ink and demonstrate thin-film solar cells with power conversion efficiency over 10%, a record efficiency for sub-400 nm thick CdTe absorber layer.
P. Cunningham, J. B. Souza Jr, I. Fedin, C. She, B. Lee, and D. V. Talapin. ACS Nano 2016, 10, 5769.
Semiconductor nanorods can emit linear-polarized light at efficiencies over 80%. Polarization of light in these systems, confirmed through single-rod spectroscopy, can be explained on the basis of the anisotropy of the transition dipole moment and dielectric confinement effects. Here we report emission polarization in macroscopic semiconductor–polymer composite films containing CdSe/CdS nanorods and colloidal CdSe nanoplatelets. Anisotropic nanocrystals dispersed in polymer films of poly butyl-co-isobutyl methacrylate (PBiBMA) can be stretched mechanically in order to obtain unidirectionally aligned arrays. A high degree of alignment, corresponding to an orientation factor of 0.87, was achieved and large areas demonstrated polarized emission, with the contrast ratio I∥/I⊥ = 5.6, making these films viable candidates for use in liquid crystal display (LCD) devices. To some surprise, we observed significant optical anisotropy and emission polarization for 2D CdSe nanoplatelets with the electronic structure of quantum wells. The aligned nanorod arrays serve as optical funnels, absorbing unpolarized light and re-emitting light from deep-green to red with quantum efficiencies over 90% and high degree of linear polarization. Our results conclusively demonstrate the benefits of anisotropic nanostructures for LCD backlighting. The polymer films with aligned CdSe/CdS dot-in-rod and rod-in-rod nanostructures show more than 2-fold enhancement of brightness compared to the emitter layers with randomly oriented nanostructures. This effect can be explained as the combination of linearly polarized luminescence and directional emission from individual nanostructures.
M. A. Boles, D. Ling, T. Hyeon, D. V. Talapin. Nat. Mater. 2016, 15, 141.
All nanomaterials share a common feature of large surface-to-volume ratio, making their surfaces the dominant player in many physical and chemical processes. Surface ligands — molecules that bind to the surface — are an essential component of nanomaterial synthesis, processing and application. Understanding the structure and properties of nanoscale interfaces requires an intricate mix of concepts and techniques borrowed from surface science and coordination chemistry. Our Review elaborates these connections and discusses the bonding, electronic structure and chemical transformations at nanomaterial surfaces. We specifically focus on the role of surface ligands in tuning and rationally designing properties of functional nanomaterials. Given their importance for biomedical (imaging, diagnostics and therapeutics) and optoelectronic (light-emitting devices, transistors, solar cells) applications, we end with an assessment of application-targeted surface engineering.
Ryan W. Crisp, Rebecca Callahan, Obadiah G. Reid, Dmitriy S. Dolzhnikov, Dmitri V. Talapin, Garry Rumbles, Joseph M. Luther, and Nikos Kopidakis. J. Phys. Chem. Lett. 2015, 6, 4815.
We report on photoconductivity of films of CdTe nanocrystals (NCs) using time-resolved microwave photoconductivity (TRMC). Spherical and tetrapodal CdTe NCs with tunable size-dependent properties are studied as a function of surface ligand (including inorganic molecular chalcogenide species) and annealing temperature. Relatively high carrier mobility is measured for films of sintered tetrapod NCs (4 cm2/(V s)). Our TRMC findings show that Te2– capped CdTe NCs show a marked improvement in carrier mobility (11 cm2/(V s)), indicating that NC surface termination can be altered to play a crucial role in charge-carrier mobility even after the NC solids are sintered into bulk films.
Chunxing She, Igor Fedin, Dmitriy S. Dolzhnikov, Peter D. Dahlberg, Gregory S. Engel, Richard D. Schaller, and Dmitri V. Talapin. ACS Nano 2015, 9, 9475.
There have been multiple demonstrations of amplified spontaneous emission (ASE) and lasing using colloidal semiconductor nanocrystals. However, it has been proven difficult to achieve low thresholds suitable for practical use of nanocrystals as gain media. Low-threshold blue ASE and lasing from nanocrystals is an even more challenging task. Here, we show that colloidal nanoplatelets (NPLs) with electronic structure of quantum wells can produce ASE in the red, yellow, green, and blue regions of the visible spectrum with low thresholds and high gains. In particular, for blue-emitting NPLs, the ASE threshold is 50 μJ/cm2, lower than any reported value for nanocrystals. We then demonstrate red, yellow, green, and blue lasing using NPLs with different thicknesses. We find that the lateral size of NPLs does not show any strong effect on the Auger recombination rates and, correspondingly, on the ASE threshold or gain saturation. This observation highlights the qualitative difference of multiexciton dynamics in CdSe NPLs and other quantum-confined CdSe materials, such as quantum dots and rods. Our measurements of the gain bandwidth and gain lifetime further support the prospects of colloidal NPLs as solution-processed optical gain materials.
Jaeyoung Jang, Dmitriy S. Dolzhnikov, Wenyong Liu, Sooji Nam, Moonsub Shim, and Dmitri V. Talapin. Nano Lett., 2015, 15, 6309.
Crystalline silicon-based complementary metal-oxide–semiconductor transistors have become a dominant platform for today’s electronics. For such devices, expensive and complicated vacuum processes are used in the preparation of active layers. This increases cost and restricts the scope of applications. Here, we demonstrate high-performance solution-processed CdSe nanocrystal (NC) field-effect transistors (FETs) that exhibit very high carrier mobilities (over 400 cm2/(V s)). This is comparable to the carrier mobilities of crystalline silicon-based transistors. Furthermore, our NC FETs exhibit high operational stability and MHz switching speeds. These NC FETs are prepared by spin coating colloidal solutions of CdSe NCs capped with molecular solders [Cd2Se3]2– onto various oxide gate dielectrics followed by thermal annealing. We show that the nature of gate dielectrics plays an important role in soldered CdSe NC FETs. The capacitance of dielectrics and the NC electronic structure near gate dielectric affect the distribution of localized traps and trap filling, determining carrier mobility and operational stability of the NC FETs. We expand the application of the NC soldering process to core–shell NCs consisting of a III–V InAs core and a CdSe shell with composition-matched [Cd2Se3]2–molecular solders. Soldering CdSe shells forms nanoheterostructured material that combines high electron mobility and near-IR photoresponse.
In Hwan Jung, Donglin Zhao, Jaeyoung Jang, Wei Chen, Erik S. Landry, Luyao Lu, Dmitri V. Talapin, and Luping Yu. Chem. Mater., 2015, 27, 5941.
Several electron accepting polymers having weak accepting–strong accepting (WA-SA) and strong accepting–strong accepting (SA-SA) monomer alternation were synthesized for studies of structure/property relationship in all-polymer solar cells. Two kinds of cyclic amide monomers, 4,10-bis(2-butyloctyl)-thieno[2′,3′:5,6]pyrido[3,4-g]thieno-[3,2-c]isoquinoline-5,11-dione (TPTI) and 5,11-bis(2-butyloctyl)-thieno[2′,3′:4,5]pyrido[2,3-g]thieno[3,2-c]quinoline-4,10-dione (TPTQ), were synthesized as weak accepting monomers (WA). Difluorinated TPTQ (FTPTQ) and well-known perylene diimide (PDI) monomers were synthesized as strong electron accepting monomers (SA). By using 1-chloronaphthalene (CN) as a cosolvent, the morphology of the polymer blended films can be finely tuned to achieve better ordering toward face-on mode and favorable phase separation between electron donor and acceptor, resulting in significant enhancement of short circuit current (Jsc) and fill factor (FF). The fluorination in the TPTQ unit reduced the dipole moment of the D–A complex and gave a negative effect on a polymer system. PFP showed worse electron accepting property with lower electron mobility than PQP. It is reasoned that the internal polarization plays an important role in the design of electron accepting polymers. As a result, PQP having TPTQ monomer exhibited the best photovoltaic performance with power conversion efficiency (PCE) of 3.52% (Voc = 0.71 V, Jsc = 8.57 mA/cm2, FF = 0.58) at a weight ratio of PTB7-Th:PQP = 1:1, under AM 1.5G.
Michael A. Boles and Dmitri V. Talapin. J. Am. Chem. Soc. 2015, 137, 4494.
This work analyzes the role of hydrocarbon ligands in the self-assembly of nanocrystal (NC) superlattices. Typical NCs, composed of an inorganic core of radius R and a layer of capping ligands with length L, can be described as soft spheres with softness parameter L/R. Using particle tracking measurements of transmission electron microscopy images, we find that close-packed NCs, like their hard-sphere counterparts, fill space at approximately 74% density independent of softness. We uncover deformability of the ligand capping layer that leads to variable effective NC size in response to the coordination environment. This effect plays an important role in the packing of particles in binary nanocrystal superlattices (BNSLs). Measurements on BNSLs composed of NCs of varying softness in several coordination geometries indicate that NCs deform to produce dense BNSLs that would otherwise be low-density arrangements if the particles remained spherical. Consequently, rationalizing the mixing of two NC species during BNSL self-assembly need not employ complex energetic interactions. We summarize our analysis in a set of packing rules. These findings contribute to a general understanding of entropic effects during crystallization of deformable objects (e.g., nanoparticles, micelles, globular proteins) that can adapt their shape to the local coordination environment.
Erfan Baghani, Stephen K. O’Leary, Igor Fedin, Dmitri V. Talapin, and Matthew Pelton. J. Phys. Chem. Lett. 2015, 6, 1032.
Using time-resolved photoluminescence spectroscopy, we show that two exciton Auger recombination dominates carrier recombination and cooling dynamics in CdSe nanoplatelets, or colloidal quantum wells. The electron–hole recombination rate depends only on the number of electron–hole pairs present in each nanoplatelet, and is consistent with a two-exciton recombination process over a wide range of exciton densities. The carrier relaxation rate within the conduction and valence bands also depends only on the number of electron–hole pairs present, apart from an initial rapid decay, and is consistent with the cooling rate being limited by reheating due to Auger recombination processes. These Auger-limited recombination and relaxation dynamics are qualitatively different from the carrier dynamics in either colloidal quantum dots or epitaxial quantum wells.
M. V. Kovalenko, A. Cabot, L. Manna, Z. Hens, D. V. Talapin, C. Kagan, V. Klimov, A. Rogach, P. Reiss, D. Milliron, P. Guyot-Sionnest, G. Konstantatos, W. Parak, T. Hyeon, B. Korgel, C. Murray, and W. Heiss. ACS Nano 2015, 9, 1012.
Colloidal nanocrystals (NCs, i.e., crystalline nanoparticles) have become an important class of materials with great potential for applications ranging from medicine to electronic and optoelectronic devices. Today’s strong research focus on NCs has been prompted by the tremendous progress in their synthesis. Impressively narrow size distributions of just a few percent, rational shape-engineering, compositional modulation, electronic doping, and tailored surface chemistries are now feasible for a broad range of inorganic compounds. The performance of inorganic NC-based photovoltaic and light-emitting devices has become competitive to other state-of-the-art materials. Semiconductor NCs hold unique promise for near- and mid-infrared technologies, where very few semiconductor materials are available. On a purely fundamental side, new insights into NC growth, chemical transformations, and self-organization can be gained from rapidly progressing in situ characterization and direct imaging techniques. New phenomena are constantly being discovered in the photophysics of NCs and in the electronic properties of NC solids. In this Nano Focus, we review the state of the art in research on colloidal NCs focusing on the most recent works published in the last 2 years.
C. E. Rowland, I. Fedin, H. Zhang, A. O. Govorov, S. K. Gray, D. V. Talapin, and R. D. Schaller. Nature Mater. 2015, 14, 484.
Fluorescence resonance energy transfer (FRET) enables photosynthetic light harvesting, wavelength downconversion in light-emitting diodes (LEDs), and optical biosensing schemes. The rate and efficiency of this donor to acceptor transfer of excitation between chromophores dictates the utility of FRET and can unlock new device operation motifs including quantum-funnel solar cells, non-contact chromophore pumping from a proximal LED, and markedly reduced gain thresholds. However, the fastest reported FRET time constants involving spherical quantum dots (0.12–1 ns) do not outpace biexciton Auger recombination (0.01–0.1 ns), which impedes multiexciton-driven applications including electrically pumped lasers and carrier-multiplication-enhanced photovoltaics. Few-monolayer-thick semiconductor nanoplatelets (NPLs) with tens-of-nanometre lateral dimensions exhibit intense optical transitions and hundreds-of-picosecond Auger recombination, but heretofore lack FRET characterizations. We examine binary CdSe NPL solids and show that interplate FRET (∼6–23 ps, presumably for co-facial arrangements) can occur 15–50 times faster than Auger recombination and demonstrate multiexcitonic FRET, making such materials ideal candidates for advanced technologies.
T. Wang, R. Vaxenburg, W. Liu, S. M. Rupich, E. Lifshitz, A. L. Efros, D. V. Talapin, and S. J. Sibener. ACS Nano 2015, 9, 725.
The electronic structure of single InSb quantum dots (QDs) with diameters between 3 and 7 nm was investigated using atomic force microscopy (AFM) and scanning tunneling spectroscopy (STS). In this size regime, InSb QDs show strong quantum confinement effects which lead to discrete energy levels on both valence and conduction band states. Decrease of the QD size increases the measured band gap and the spacing between energy levels. Multiplets of equally spaced resonance peaks are observed in the tunneling spectra. There, multiplets originate from degeneracy lifting induced by QD charging. The tunneling spectra of InSb QDs are qualitatively different from those observed in the STS of other III–V materials, for example, InAs QDs, with similar band gap energy. Theoretical calculations suggest the electron tunneling occurs through the states connected with L-valley of InSb QDs rather than through states of the Γ-valley. This observation calls for better understanding of the role of indirect valleys in strongly quantum-confined III–V nanomaterials.
D. S. Dolzhnikov, H. Zhang, J. Jang, J. S. Son, M. G. Panthani, S. Chattopadhyay, T. Shibata, and D. V. Talapin. Science 2015, 347, 425.
Technology Update: "Semiconductor solder seals nanojoints"
We propose a general strategy to synthesize largely unexplored soluble chalcogenidometallates of cadmium, lead, and bismuth. These compounds can be used as “solders” for semiconductors widely used in photovoltaics and thermoelectrics. The addition of solder helped to bond crystal surfaces and link nano- or mesoscale particles together. For example, CdSe nanocrystals with Na2Cd2Se3solder was used as a soluble precursor for CdSe films with electron mobilities exceeding 300 square centimeters per volt-second. CdTe, PbTe, and Bi2Te3 powders were molded into various shapes in the presence of a small additive of composition-matched chalcogenidometallate or chalcogel, thus opening new design spaces for semiconductor technologies.
A. Nag, H. Zhang, E. Janke, and D. V. Talapin. Z. Phys. Chem. (Special issue Horst Weller 60th birthday) 2015, 229, 85.
Since the discovery of metal chalcogenide complexes (MCCs) as capping ligands for colloidal nanocrystals (NCs) in 2009, the chemistry of inorganic ligands for NCs has provided a new paradigm for surface design of nanomaterials. Various inorganic anions including MCCs, metal-free chalcogenides, oxoanions/oxometallates, and halides/pseudohalides/halometallates have been employed to replace the original long-chain organic ligands on NCs. This ligand exchange can also be achieved through a two-step route using ligands stripping agents like HBF4. This review outlines recent advances in inorganically-capped colloidal NCs and details the ligand exchange process for NCs using MCCs and metal-free chalcogenides. The binding affinities of ligands to NC surface have been rationalized in terms of Pearson's hard and soft acids and bases (HSAB) principle. We also demonstrate that inorganic ligands broaden the functionality of NCs by tailoring their electro-optical properties or generating new inorganic phases through chemical reactions between nanomaterials and their surface ligands. Especially promising are the electronic, optoelectronic, and thermoelectric applications of solution-processed, inorganically-capped colloidal NCs, which substantially outperform their organically-capped couterparts.
Sara Rupich, Fernando Castro, William T.M. Irvine, and Dmitri Talapin. Nature Communications 2014, 5, 5045.
Jing Huang, Wenyong Liu, Dmitriy S. Dolzhnikov, Loredana Protesescu, Maksym V. Kovalenko, Bonil Koo, Soma Chattopadhyay, Elena V. Shevchenko, and Dmitri V. Talapin. ACS Nano 2014, 8, 9388.
Ryan W. Crisp, Matthew G. Panthani, William L. Rance, Joel N. Duenow, Philip A. Parilla, Rebecca Callahan, Matthew S. Dabney, Joseph J. Berry, Dmitri V. Talapin, and Joseph M. Luther. ACS Nano 2014, 8, 9063.
Angela Y. Chang, Wenyong Liu, Dmitri V. Talapin, and Richard D. Schaller. ACS Nano 2014, 8, 8513.
Igor Fedin and Dmitri V. Talapin. J. Am. Chem. Soc. 2014, 136, 11228.
Hao Zhang and Dmitri V. Talapin. Angew. Chem. Int. Ed. 2014, 53, 9126.
C. She, I. Fedin, M. A. Boles, D. S. Dolzhnikov, R. D. Schaller, M. Pelton, and D. V. Talapin. SID Digest 2014, 45, 134.
Hao Zhang, Jaeyoung Jang, Wenyong Liu, and Dmitri V. Talapin. ACS Nano 2014, 8, 7359.
Michael A. Boles and Dmitri V. Talapin. Science 2014, 344, 1340.
Chengyang Jiang, Wenyong Liu, and Dmitri V. Talapin. Chem. Mater. 2014, 26, 4038.
Jae Sung Son, Hao Zhang, Jaeyoung Jang, Bed Poudel, Al Waring, Luke Nally, and Dmitri V. Talapin. Angew. Chem. Int. Ed. 2014, 126, 7596.
In Hwan Jung, Wai-Yip Lo, Jaeyoung Jang, Wei Chen, Donglin Zhao, Erik S. Landry, Luyao Lu, Dmitri V. Talapin, and Luping Yu. Chem. Mater. 2014, 26, 3450.
Chunxing She, Igor Fedin, Dmitriy S. Dolzhnikov, Arnaud Demortière, Richard D. Schaller, Matthew Pelton, and Dmitri V. Talapin. Nano Lett. 2014, 14, 2772.
Michael A. Boles and Dmitri V. Talapin. J. Am. Chem. Soc. 2014, 136, 5868.
Haibin Zheng, Justin R. Caram, Peter D. Dahlberg, Brian S. Rolczynski, Subha Viswanathan, Dmitriy S. Dolzhnikov, Amir Khadivi, Dmitri V. Talapin, and Gregory S. Engel. Applied Optics 2014, 53, 1909.
Justin R. Caram, Haibin Zheng, Peter D. Dahlberg, Brian S. Rolczynski, Graham B. Griffin, Dmitriy S. Dolzhnikov, Dmitri V. Talapin, and Gregory S. Engel. J. Chem. Phys. 2014, 140, 084701.
Jaeyoung Jang, Wenyong Liu, Jae Sung Son, and Dmitri V. Talapin. Nano Lett. 2014, 14, 653.
Matthew G. Panthani, J. Matthew Kurley, Ryan W. Crisp, Travis C. Dietz, Taha Ezzyat, Joseph M. Luther, and Dmitri V. Talapin. Nano Lett. 2014, 14, 670.
Clare E. Rowland, Wenyong Liu, Daniel C. Hannah, Maria K. Y. Chan, Dmitri V. Talapin, and Richard D. Schaller. ACS Nano 2014, 8, 977.
Justin R. Caram, Haibin Zheng, Peter D. Dahlberg, Brian S. Rolczynski, Graham B. Griffin, Andrew F. Fidler, Dmitriy S. Dolzhnikov, Dmitri V. Talapin, and Gregory S. Engel. J. Phys. Chem. Lett. 2014, 5, 196.
Hao Zhang, Jae Sung Son, Jaeyoung Jang,Jong-Soo Lee, Wee-Liat Ong, Jonathan A. Malen, and Dmitri V. Talapin. ACS Nano 2013, 7, 10296.
Dmitri V. Talapin and Jonathan Steckel. MRS Bull. 2013, 38, 685.
Jae Sung Son, Jong-Soo Lee, Elena V. Shevchenko, and Dmitri V. Talapin. J. Phys. Chem. Lett. 2013, 4, 1918.
Karthish Manthiram, Brandon J. Beberwyck, Dmitri V. Talapin, and A. Paul Alivisatos. J. Vis. Exp. 2013, 82, e50731.
Wee-Liat Ong, Sara M. Rupich, Dmitri V. Talapin, Alan J. H. McGaughey, and Jonathan A. Malen. Nat. Mater. 2013, 12, 410.
Yadong Yin and Dmitri Talapin. Chem. Soc. Rev. 2013, 42, 2484.
K. J. van Schooten, J. Huang, D. V. Talapin, C. Boehme, and J. M. Lupton. Phys. Rev. B. 2013, 87, 125412.
Eyal Shafran, Nicholas J. Borys, Jing Huang, Dmitri V. Talapin, and John M. Lupton. J. Phys. Chem. Lett. 2013, 4, 691.
Wenyong Liu, Jong-Soo Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2013, 135, 1349.
Michele Saba, Mauro Aresti, Francesco Quochi, Marco Marceddu, Maria Antonietta Loi, Jing Huang, Dmitri V. Talapin, Andrea Mura, and Giovanni Bongiovanni. ACS Nano 2013, 7, 229.
Kipp J. van Schooten, Jing Huang, William J. Baker, Dmitri V. Talapin, Christoph Boehme, and John M. Lupton. Nano Lett. 2013, 13, 65.
Graham B. Griffin, Sandrine Ithurria, Dmitriy S. Dolzhnikov, Alexander Linkin, Dmitri V. Talapin, and Gregory S. Engel. J. Chem. Phys. 2013, 138, 014705.
Wenyong Liu, Angela Y. Chang, Richard D. Schaller, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 20258.
Matthew Pelton, Sandrine Ithurria, Richard D. Schaller, Dmitriy S. Dolzhnikov, and Dmitri V. Talapin. Nano Lett. 2012, 12, 6158.
Sandrine Ithurria and Dmitri Talapin. J. Am. Chem. Soc. 2012, 134, 18585.
Angshuman Nag, Dae Sung Chung, Dmitriy S. Dolzhnikov, Nada M. Dimitrijevic, Soma Chattopadhyay, Tomohiro Shibata, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 13604.
Dae Sung Chung, Jong-Soo Lee, Jing Huang, Angshuman Nag, Sandrine Ithurria, and Dmitri V. Talapin. Nano Lett. 2012, 12, 1813.
Chengyang Jiang, Jong-Soo Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 5010.
Maksym V. Kovalenko, Richard D. Schaller, Dorota Jarzab, Maria A. Loi, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 2457.
Ilka Kriegel, Chengyang Jiang, Jessica Rodriguez-Fernández, Richard D. Schaller, Dmitri V. Talapin, Enrico da Como, and Jochen Feldmann. J. Am. Chem. Soc. 2012, 134, 1583.
Dmitri V. Talapin. MRS Bull. 2012, 37, 63.
Daniel C. Hannah, Sandrine Ithurria, Galyna Krylova, Dmitri V. Talapin, George C. Schatz, and Richard D. Schaller. Nano Lett. 2012, 12, 5797.
Elad Harel, Sara M. Rupich, Richard D. Schaller, Dmitri V. Talapin, and Gregory S. Engel. Phys. Rev. B 2012, 86, 075412.
Su Liu, Nicholas J. Borys, Jing Huang, Dmitri V. Talapin, and John M. Lupton. Phys. Rev. B 2012, 86, 045303.
Marco Marceddu, Michele, Saba, Francesco Quochi, Adriano Lai, Jing Huang, Dmitri V. Talapin, Andrea Mura, and Giovanni Bongiovanni. Nanotechnology 2012, 23, 015201.
Maryna I. Bodnarchuk, Elena V. Shevchenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2011, 133, 20837.
Sara M. Rupich and Dmitri V. Talapin. Nat. Mater. 2011, 10, 815.
134. Observation of Size-Dependent Thermalization in CdSe Nanocrystals Using Time-Resolved Photoluminescence Spectroscopy Daniel C. Hannah, Nicholas J. Dunn, Sandrine Ithurria, Dmitri V. Talapin, Lin X. Chen, Matthew Pelton, George C. Schatz, and Richard D. Schaller. Phys. Rev. Lett. 2011, 107, 177403.
Angshuman Nag, Maksym V. Kovalenko, Jong-Soo Lee, Wenyong Liu, Boris Spokoyny, and Dmitri V. Talapin. J. Am. Chem. Soc. 2011, 133, 10612.
Dmitri V. Talapin and Yadong Yin. J. Mater. Chem. 2011, 21, 11454.
Maryna I. Bodnarchuk, Liang Li, Alice Fok, Sigrid Nachtergaele, Rustem F. Ismagilov, and Dmitri V. Talapin. J. Am. Chem. Soc. 2011, 133, 8956.
Jong-Soo Lee, Maksym V. Kovalenko, Jing Huang, Dae Sung Chung, and Dmitri V. Talapin. Nature Nanotech. 2011, 6, 348.
Stefan Pichler, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Maksym Yarema, Gunther Springholz, Dmitri V. Talapin, and Wolfgang Heiss. ACS Nano 2011, 5, 1703.
Nicholas J. Borys, Manfred J. Walter, Jing Huang, Dmitri V. Talapin, and John M. Lupton. Science 2010, 330, 1371.
Andrey A. Lutich, Christian Mauser, Enrico Da Como, Jing Huang, Aleksandar Vaneski, Dmitri V. Talapin, Andrey L. Rogach, and Jochen Feldmann. Nano Lett. 2010, 10, 4646.
Jing Huang, Maksym V. Kovalenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 15866.
Maskym Yarema, Maksym V. Kovalenko, Guenter Hesser, Dmitri V. Talapin, and Wolfgang Heiss. J. Am. Chem. Soc. 2010, 132, 15158.
Maksym V. Kovalenko, Maryna I. Bodnarchuk, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 15124.
H. Puehringer, J. Roither, Maksym V. Kovalenko, M. Eibelhuber, T. Schwarzl, Dmitri V. Talapin, and Wolfgang Heiss. Appl. Phys. Lett. 2010, 97, 111115.
Galyna Krylova, Nada M. Dimitrijevic, Dmitri V. Talapin, Jeffrey R. Guest, Holger Borchert, Arun Lobo, Tijana Rajh, and Elena V. Shevchenko. J. Am. Chem. Soc. 2010, 132, 9102.
Paul Podsiadlo, Galyna Krylova, Byeongdu Lee, Kevin Critchley, David J. Gosztola, Dmitri V. Talapin, Paul D. Ashby, and Elena V. Shevchenko, J. Am. Chem. Soc. 2010, 132, 8953.
Maryna I. Bodnarchuk, Maksym V. Koyalenko, Wolfgang Heiss, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 11967.
C. Mauser, E. Da Como, J. Baldauf, A. L. Rogach, J. Huang, D. V. Talapin, and J. Feldmann. Phys. Rev. B 2010, 82, 081306.
Maksym V. Kovalenko, Maryna I. Bodnarchuk, Jana Zaumseil, Jong-Soo Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 10085.
Jong-Soo Lee, Maryna I. Bodnarchuk, Elena V. Shevchenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 6382.
Maksym V. Kovalenko, Boris Spokoyny, Jong-Soo Lee, Marcus Scheele, Andrew Weber, Susanthri Perera, Daniel Landry, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 6686-6695.
Soontorn Chanyawadee, Pavlos G. Lagoudakis, Richard T. Harley, Martin D. B. Charlton, Dmitri V. Talapin, Hong Wen Huang, and Chung-Hsiang Lin. Adv. Mater. 2010, 22, 602.
Sara M. Rupich, Elena V. Shevchenko, Maryna I. Bodnarchuk, Byeongdu Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 289.
Byeongdu Lee, Paul Podsiadlo, Sara Rupich, Dmitri V. Talapin, Tijana Rajh, and Elena V. Shevchenko. J. Am. Chem. Soc. 2009, 131, 16386.
Klaus Becker, Andrey L. Rogach, Jochen Feldmann, Dmitri V. Talapin, and John M. Lupton. App. Phys. Lett. 2009, 95, 143101.
Dmitri V. Talapin, Elena V. Shevchenko, Maryna I. Bodnarchuk, Xingchen Ye, Jun Chen, and Christopher B. Murray. Nature 2009, 461, 964.
Maksym V. Kovalenko, Marcus Scheele, and Dmitri V. Talapin. Science 2009, 324, 1417.
Michele Saba, Stefan Minniberger, Francesco Quochi, Juergen Roither, Marco Marceddu, Agnieszka Gocalinska, Maksym V. Kovalenko, Dmitri V. Talapin, Wolfgang Heiss, Andrea Mura, and Giovanni Bongiovanni. Adv. Mater. 2009, 21, 4942.
S. Wu, G. Han, D. Milliron, S. Aloni, V. Altoe, D. Talapin, B. Cohen, and P. J. Schuck. Proc. Nat. Acad. Sci. 2009, 106, 10917.
G. Maruccio, C. Meyer, T. Matsui, D. V. Talapin, S. G. Hickey, H. Weller, and R. Wiesendanger. Small 2009, 5, 808.
S. Chanyawadee, R. T. Harley, M. Henini, D. V. Talapin, and P. G. Lagoudakis. Phys. Rev. Lett. 2009, 102, 077402.
Elena V. Shevchenko, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Dmitri V. Talapin, Rachel K. Smith, Shaul Aloni, Wolfgang Heiss, and A. Paul Alivisatos. Adv. Mater. 2008, 20, 4323.
A. Biebersdorf, R. Dietmueller, A. Ohlinger, T. A. Klar, J. Feldmann, D. V. Talapin, and H. Weller. Appl. Phys. B 2008, 93, 239.
Jong-Soo Lee, Elena V. Shevchenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2008, 130, 9673.
E. V. Shevchenko and D. V. Talapin. In Semiconductor Nanocrystal Quantum Dots. A. L. Rogach, ed. Springer 2008, ISBN 978-3-211-75235-7.
R. Y. Wang, J. P. Feser, J.-S. Lee, D. V. Talapin, R. Segalman, and A. Majumdar. Nano Lett. 2008, 8, 2283.
R. Bose, J. F. McMillan, J. Gao, K. M. Rickey, C. J. Chen, D. V. Talapin, C. B. Murray, and C. W. Wong. Nano Lett. 2008, 8, 2006.
S. Maria, A. S. Susha, M. Sommer, D. V. Talapin, A. L. Rogach, and M. Thelakkat. Macromolecules 2008, 41, 6081.
S. V. Voitekhovich, D. V. Talapin, C. Klinke, A. Kornowski, and H. Weller. Chem. Mater. 2008, 20, 4545.
D. V. Talapin. ACS Nano 2008, 2, 1097.
C. Mauser, T. Limmer, E. Da Como, K. Becker, A. L. Rogach, J. Feldmann, and D. V. Talapin. Phys. Rev. B 2008, 77, 153303.
M. V. Kovalenko, D. V. Talapin, M. A. Loi, F. Cordella, G. Hesser, M. I. Bodnarchuk, and W. Heiss. Angew. Chem. Int. Ed. 2008, 47, 3029.
E. V. Shevchenko, M. Ringler, A. Schwemer, D. V. Talapin, T. A. Klar, AL. Rogach, J. Feldmann, and A. Paul Alivisatos. J. Am. Chem. Soc. 2008, 130, 3274-3275.
D. V. Talapin, J. H. Nelson, E. V. Shevchenko, S. Aloni, B. Sadtler, and A. P. Alivisatos. Nano Lett. 2007, 7, 2951.
M. V. Kovalenko, W. Heiss, E. V. Shevchenko, J.-S. Lee, H. Schwinghammer, A. P. Alivisatos, and D. V. Talapin. J. Am. Chem. Soc. 2007, 129, 11354.
X. Chen, M. Hirtz, A. L. Rogach, D. V. Talapin, H. Fuchs, L. Chi. Nano Lett. 2007, 7, 3483.
D. V. Talapin, H. Yu, E. V. Shevchenko, A. Lobo, and C. B. Murray. J. Phys. Chem. C, 2007, 111, 14049.
D. V. Talapin, C. T. Black, C. R. Kagan, E. V. Shevchenko, A. Afzali, and C. B. Murray. J. Phys. Chem. C, 2007, 111, 13244.
E. V. Shevchenko, J. Kortright, D. V. Talapin, S. Aloni, and A. P. Alivisatos. Adv. Mater. 2007, 19, 4183.
D. Soujon, K. Becker, A. Rogach, J. Feldman, H. Weller, D. V. Talapin, and J. M. Lupton. J. Phys. Chem. C, 2007, 111, 11511.
D. V. Talapin, E. V. Shevchenko, C. B. Murray, A. V. Titov, and P. Král. Nano Lett. 2007, 7, 1213.
J. J. Urban, D. V. Talapin, E. V. Shevchenko, C. R. Kagan, and C. B. Murray. Nature Mater. 2007, 6, 115.
S. Kaufmann, T. Stöferle, N. Moll, R. F. Mahrt, U. Scherf, A. Tsami, D. V. Talapin, and C. B. Murray. Appl. Phys. Lett. 2007, 90, 071108.
T. Franzl, J. Müller, T. A. Klar, A. L. Rogach, J. Feldmann, D. V. Talapin, and H. Weller. J. Phys. Chem. C 2007, 111, 2974.
J. H. Ahn, C. Bertoni, S. Dunn, C. Wang, D. V. Talapin, N. Gaponik, A. Eychmuller, Y. Hua, M. R. Bryce, and M. C. Petty. Nanotechnology 2007, 33, 335202.
R. M. Kraus, P. G. Lagoudakis, A. L. Rogach, D. V. Talapin, H. Weller, J. M. Lupton, J. Feldmann. Phys Rev. Lett. 2007, 98, 017401.
K. Becker, J. M. Lupton, J. Müller, A. L. Rogach, D. V. Talapin, H. Weller, and J. Feldmann. Nature Materials 2006, 5, 777.
X. Chen, A. L. Rogach, D. V. Talapin, H. Fuchs, and L. Chi. J. Am. Chem. Soc. 2006, 128, 9592.
A. Biebersdorf, R. Dietmüller, A. S. Susha, A. L. Rogach, S. K. Poznyak, D. V. Talapin, H. Weller, T. A. Klar, J. Feldmann. Nano Letters2006, v. 6, 1559-1563.
76. Structural Diversity in Binary Nanoparticle Superlattices. E. V. Shevchenko, D. V. Talapin, N. A. Kotov, S. O’Brien, C. B. Murray. Nature 2006, v. 439, pp. 55-59.
Highlights: Nano Building Made Easy. Technology Review.
D. Frankel. Plenty of room at the top. Nature Materials2006, vol. 5, 85-86.
A. van Blaaderen. Colloids get complex. Nature2006 vol.439, 545-546.
C. Day. Colloidal particles crystallize in an increasingly wide range of structures. Physics Today. June 2006, pp. 113-15.
I. Amato. A Periodic Table of Nanoparticles. C&EN, 2006, v. 84, no. 34, pp. 45-46.
New Families of Self-Assembled Nanolattices Created. MRS Bulletin, 2006, v. 31, p. 80.
75. Structural Characterization of Self-Assembled Multifunctional Binary Nanoparticle Superlattices. E. V. Shevchenko, D. V. Talapin, C. B. Murray, S. O’Brien. J. Am. Chem. Soc.2006; 128(11); 3620-3637.
74. Self-Assembly of PbTe Quantum Dots into Nanocrystal Superlattices and Glassy Films. J. J. Urban, D. V. Talapin, E. V. Shevchenko, C. B. Murray. J. Am. Chem. Soc., 2006,v. 128pp 3248–3255.
73. Surface oxidation of CdTe nanocrystals—A high resolution core-level photoelectron spectroscopy study. A. Lobo, H. Borchert, D.V. Talapin, H. Weller, T. Möller. Colloids and Surfaces A., 2006, v. 286, pp 1–7.
72. PbSe Nanocrystal Solids for n- and p-Channel Thin Film Field-Effect Transistors. D. V. Talapin, C. B. Murray. Science2005, v. 310, pp. 86-89.
Turning insulating nanocrystal films into semiconductors. Materials Today. 2005 v.8, p.9.
Thin Film Transistors from Solution-Processable Nanocrystals. Nanoparticle News. 2005, v. 8, pp. 3-4.
70. Wavefunction engineering in elongated semiconductor nanocrystals with heterogeneous carrier confinement. J. Müller, J. M. Lupton, P. G. Lagoudakis, R. Koeppe, A. L. Rogach, J. Feldmann, D. V. Talapin, H. Weller. Nano Letters2005, v. 5,pp. 2044-2049.
69. Polarized-Light-Emitting Quantum-Rod Diodes. R. A. M. Hikmet, P. T. K. Chin, D. V. Talapin, H. Weller. Adv. Mater.2005, v. 17, pp. 1436-1439.
68. Designing PbSe Nanowires and Nanorings through Oriented Attachment of Nanoparticles. K.-S. Cho,D. V. Talapin, W. Gaschler, C. B. Murray. J. Am. Chem. Soc.2005, v.127; pp. 7140-7147.
Highlight: “Designer wires” J. Chem. Ed.2005, 82, 1437-1438.
67. Polymorphism in AB13nanoparticle superlattices: an example of semiconductor-metal metamaterials. E. V. Shevchenko, D. V. Talapin, S. O’Brien, C. B. Murray. J. Am. Chem. Soc.2005, v. 127, pp. 8741-8747.
Highlight: Nature Materials2005, v. 4, p.509.
66.Interplay between Auger and Ionization Processes in Nanocrystal Quantum Dots. R. M. Kraus, P. G. Lagoudakis, J. Mueller, A. L. Rogach, J. M. Lupton, J. Feldmann, D. V. Talapin, H. Weller. J. Phys. Chem. B. 2005, v.109,pp. 18214-18217.
65. The effect of nanocrystal surface structure on the luminescence properties: photoemission study of HF-etched InP nanocrystals. S. Adam, D. V. Talapin, H. Borchert, A. Lobo, C. McGinley, A. R. B. de Castro, M. Haase, H. Weller, T. Möller. J. Chem. Phys. 2005, v. 123, pp. 084706.
64. Self-assembly of monodisperse nanocrystals into facetted crystal superlattices. D. V. Talapin, E. V. Shevchenko, N. Gaponik, I. L. Radtchenko, A. Kornowski, M. Haase, A. L. Rogach, H. Weller. Adv. Mater.2005, v. 17, pp. 1325-1329.
63. Electrochemical oxidation of titanium by pulsed discharge in electrolyte. S. K. Poznyak, D. V. Talapin, A. I. Kulak. J. Electroanal. Chem.2005, v. 579, pp. 299-310.
62.Magnetic Nanocrystals and Their Superstructures. E. V. Shevchenko, D. V. Talapin, A. L. Rogach, H. Weller. in: Nanoparticle Assemblies and Superstructures, Ed.: N. A. Kotov, Marcel Dekker Ltd., 2005.
61. Size-dependent electrochemical behavior of thiol capped CdTe nanocrystals in aqueous solution. S. K. Poznyak, N. P. Osipovich, A. Shavel, D. V. Talapin, M. Gao, A. Eychmüller, N. Gaponik. J. Phys. Chem. B. 2005, vol. 109, pp. 1094-1100.
60. CdSe/CdS/ZnS and CdSe/ZnSe/ZnS core-shell-shell nanocrystals. D. V. Talapin, I. Mekis, S. Götzinger,A. Kornowski, O. Benson,and H. Weller. J. Phys. Chem. B. 2004, vol. 108, pp.18826-18831.
Editors’ ChoiceScience 2004, vol. 306, p. 1439.
59. Monitoring surface charge movement in single elongated semiconductor nanocrystals. J. Müller, J. M. Lupton, A. L. Rogach, J. Feldmann, D. V. Talapin, H. Weller. Phys. Rev. Lett.2004, vol. 93, pp.167402-1 - 167402-4.
58. CdSe and CdSe/CdS nanorod solids. D. V. Talapin, E. V. Shevchenko, C. B. Murray, A. Kornowski, S. Förster and H. Weller.J. Am. Chem. Soc.2004,vol. 126,pp. 12984-12988.
Highlight: C. Sealy. Solid approach to Self-Assembly. Materials Today. 2004 v.7, no12, p.14.
57. Lateral Patterning of Luminescent CdSe Nanocrystals by Selective Dewetting from Self-Assembled Organic Templates. N. Lu, X. Chen, D. Molenda, A. Naber, H. Fuchs, D. V. Talapin, H. Weller, J. Müller, J. M. Lupton, J. Feldmann, A. L. Rogach, L. Chi. NanoLetters, 2004, vol. 4, pp.885-888.
56. Quantum Dot Chemiluminescence. S. K. Poznyak, D. V. Talapin, E. V. Shevchenko, H. Weller. NanoLetters, 2004, vol. 4, pp. 693-698.
55. Highly directional emission from colloidally synthesized nanocrystals in vertical cavities with small mode spacing. J. Roither, W. Heiss, D. V. Talapin, N. Gaponik, A. Eychmuller.Appl. Phys. Lett. 2004, vol 84, p. 2223.
54. Formation of Nanoparticle Arrays on S-Layer Protein Lattices. E. Györvary, A. Schroedter, D. V. Talapin, H. Weller, D. Pum, U. B. Sleytr. J. Nanoscience and Nanotechnology2004, vol. 4, pp.115-120.
53. Confocal microscopy and spectroscopy of nanocrystals on a high-Q microsphere resonator. S. Götzinger, L. de S. Menezes, O. Benson, D. V. Talapin, N. Gaponik, H. Weller, A. L. Rogach and V. Sandoghdar. J. Opt. B: Quantum Semiclass. Opt.2004, vol. 6pp.154–158.
52. Semiconductor Nanoparticles.A. L. Rogach, D. V. Talapin, H. Weller In "Colloids and Colloidal Assemblies" Ed. F. Caruso, WILEY VCH, Weinheim, 2004. pp.52-95.
51.Core-level photoemission study of the InAs/CdSe nanocrystalline system. C. McGinley, H. Borchert, D. V. Talapin, S. Adam, A. Lobo, A. R. B. de Castro, M. Haase, H. Weller, and T. Möller. Phys. Rev. B, 2004, vol. 69, p. 045301.
50. Air-induced fluorescence bursts from single semiconductor nanocrystals. J. Muller, J. M. Lupton, A. L. Rogach, J. Feldmann, D. V. Talapin, H. Weller. Appl. Phys. Lett.2004, vol. 85, pp. 381-383.
49. Photogeneration of charge carriers in blends of conjugated polymers and semiconducting nanoparticles. M. Pientka, J. Wisch, S. Boeger, J. Parisi, V. Dyakonov, A. Rogach, D. Talapin, H. Weller. Thin Solid Films 2004, vol. 451-452, pp. 48-53.
48. Highly emissive colloidal CdSe/CdS heterostructures of mixed dimensionality.D. V. Talapin, R. Koeppe, S. Götzinger, A. Kornowski, J. M. Lupton, A. L. Rogach, O. Benson, J. Feldmann, H. Weller. NanoLetters, 2003, vol. 3, pp.1677-1681.
Editors’ ChoiceScience 2003, vol. 302, p. 1117.
47.Effect of ZnS shell thickness on the phonon spectra in CdSe quantum dots. A. V. Baranov, Yu. P. Rakovich, J. F. Donegan, T. S. Perova, R. A. Moore, D. V. Talapin, A.L. Rogach, Y. Masumoto, I. Nabiev. Phys. Rev. B, 2003, vol. 68, p.165306.
46. A study of conduction mechanism and electroluminescence in the PEDOT:PSS - CdSe/ZnS quantumdot composites. R.A.M Hikmet, D.V. Talapin, H. Weller. J. Appl. Phys. 2003, vol. 93, pp. 3509-3514.
45. Study of nucleation and growth in the hot organometallic synthesis of magnetic alloy nanocrystals: the role of nucleation rate in size control of CoPt3 nanocrystals. E. V. Shevchenko, D. V. Talapin, H. Schnablegger, A. Kornowski, M. Haase, H. Weller. J. Am. Chem. Soc.2003,vol. 125,pp. 9090-9101.
44. Synthesis and characterization of magnetic nanoparticles. D. V. Talapin, E. V. Shevchenko, H. Weller. In "Nanoparticles – from Theory to Applications." Ed. G. Schmid, WILEY VCH, 2003, ISBN: 3-527-30507-6.
43. Self-assembly of Metal Nanoparticles. G. Schmid, D. V. Talapin, and E. V. Shevchenko. In "Nanoparticles – from Theory to Applications." Ed. G. Schmid, WILEY VCH, 2003, ISBN: 3-527-30507-6.
42. Relations between the Photoluminescence Efficiency of CdTe Nanocrystals and their Surface Properties revealed by Synchrotron XPS. H. Borchert, D. V. Talapin, N. Gaponik, C. McGinley, S. Adam, A. Lobo, T. Möller, H. Weller. J. Phys. Chem. B2003, vol. 107, p. 9662.
41. Up-conversion luminescence via a below-gap state in CdSe/ZnS quantum dots. Yu.P. Rakovich, J.F. Donegana, S.A. Filonovich, M.J.M. Gomes, D.V. Talapin, A.L. Rogach, A. Eychmüller. Physica E2003, vol. 17, pp. 99 – 100.
40. Photoemission study of size selected InP nanocrystals: The relationship between luminescence yield and surface structure. S. Adam, C. McGinley, T. Möller, D. V. Talapin, H. Borchert, M. Haase, H. Weller. Eur. J. Phys. D2003, vol. 24, pp. 373-376.
39. One-pot synthesis of highly luminescent CdSe/CdS core-shell nanocrystals via organometallic and “greener” chemical approaches. I. Mekis, D. V. Talapin, A. Kornowski, M. Haase, H.Weller. J. Phys. Chem. B 2003,vol. 107,pp. 7454-7462.
38.Size selective photoluminescence excitation spectroscopy in CdTe quantum dots. Y. Rakovich, L. Walsh, L. Bradley, J.F.Donegan, D. Talapin, A. Rogach, A. Eychmüller. Ed. W.J. Blau et al. SPIE Proceedings4876 (2003) 432.
37. Photoinduced Charge Transfer in Composites of Conjugated Polymers and Semiconducting Nanoparticles. M. Pientka, V. Dyakonov, D. Meissner, A. Rogach, D. Talapin, H. Weller, D. Vanderzande.Nanotechnology, 2003, vol. 15, issue 1, pp 163 - 170.
36.Controlled coupling of a single emitter to a single mode of a microsphere: where do we stand? S. Götzinger, L. de S. Menezes, A. Mazzei, O. Benson, D. V. Talapin, N. Gaponik, H. Weller, A. L. Rogach, V. Sandoghdar. Proc. of SPIE2003, vol. 4969, pp. 207-214.
35. High resolution photoemission study of CdSe and CdSe/ZnS core-shell nanocrystals. H. Borchert, D. V. Talapin, C. McGinley, S. Adam, A. R. B. de Castro, T. Möller,H. Weller. J. Chem. Phys.2003, vol. 119, pp. 1800-1807.
34. Control of Efficiency of Photon Energy Up-Conversion in CdSe/ZnS Quantum Dots. K. I. Rusakov, A. A. Gladyshchuk, Yu. P. Rakovich, J. F. Donegan, S. A. Filonovich, M. J. M. Gomes, D. V. Talapin, A. L. Rogach, and A. Eychmüller. Optics and Spectroscopy2003, vol. 94, No. 6, , pp. 859–863.
33. Photoluminescence Up-conversion in CdTe Nanocrystals. K. I. Rusakov, A. A. Gladyschuk, D. Talapin, A. Eychmüller. In: Physics, Chemistry, and Application of Nanostructures / ed. by V.E.Borisenko et al., World Scientific. Singapore. 2003. pp.124-127.
32. Evolution of Optical Phonons in CdSe/ZnS Quantum Dots: Raman Spectroscopy. A. V. Baranov, S. T. Perova, A. Moore, Yu. P. Rakovich, J. F. Donegan, D. Talapin. In: Physics, Chemistry, and Application of Nanostructures / ed. by V.E.Borisenko et al., World Scientific. Singapore. 2003. pp.132-135.
31. Dipole-Dipole Interaction Effect on the Optical Response of Quantum Dot Ensembles. V. I. Boev, S. A. Filonovich, M. I. Vasilevskiy, C. I. Silva, M. J. M. Gomes, D. V. Talapin, A. L. Rogach. Physica B2003, vol. 338, pp. 347–352.
30. Etching of Colloidal InP Nanocrystals with Fluorides: Photochemical Nature of the Process Resulting in High Photoluminescence Efficiency. D. V. Talapin, N. Gaponik, H. Borchert, A. L. Rogach, M. Haase, H. Weller. J. Phys. Chem. B, 2002, vol. 106, pp. 12659-12663.
29.Dynamic Distribution of Growth Rates within the Ensembles of Colloidal II-VI and III-V Semiconductor Nanocrystals as a Factor Governing their Photoluminescence Efficiency. D. V. Talapin, A. L. Rogach, E. V. Shevchenko, A. Kornowski, M. Haase, H. Weller. J. Am. Chem. Soc.2002, vol. 124, pp. 5782-5790.
28. Colloidal Synthesis and Self-Assembly of CoPt3nanocrystals. E. V. Shevchenko, D. V. Talapin, A. L. Rogach, A. Kornowski, M. Haase and H. Weller, J. Am. Chem. Soc. 2002, vol. 124, pp.11480-11485; ibid.2002, vol.124, pp.13958-13958..
27. Organization of Matter on Different Size Scales: Monodisperse Nanocrystals and their Superstructures. A. L. Rogach, D. V. Talapin, E. V. Shevchenko, A. Kornowski, M. Haase, H. Weller. Adv. Funct. Mater., Feature Article., 2002, vol. 12, pp. 653-664.
26. Synthesis of Surface-modified Semiconductor Nanocry stals and Study of Photoinduced Charge Separation and Transport in Nanocrystal-Polymer Composites. D. V. Talapin, S. K. Poznyak, N. P. Gaponik, A. L. Rogach, A. Eychmüller. Physica E2002, vol. 14, pp. 237-241.
25. Colloidally synthesises semiconductor nanocrystals in resonant cavity light emitting devices. J. Roither, W. Heiss, N. P. Gaponik, D. V. Talapin and A. Eychmüller.Electronic Letters2002, vol. 38, pp. 1373.
24. Synthesis and Surface Modification of Amino-Stabilized CdSe, CdTe and InP Nanocrystals.D. V. Talapin, A. L. Rogach, I. Mekis, S. Haubold, A. Kornowski, M. Haase, H. Weller. Coll. Surf. A,2002, vol. 202, pp. 145-154.
23. Breaking and restoring a molecularly bridged metal | quantum dot junction. Z. Hens, D. V. Talapin, H. Weller, D. Vanmaekelbergh. Appl. Phys. Lett.2002, vol. 81, pp. 4245-4247.
22. Efficient Phase Transfer of Luminescent Thiol-Capped Nanocrystals: from Water to Non-polar Organic Solvents. N. Gaponik, D. V. Talapin, A. L. Rogach, A. Kornowski, A. Eychmüller, H. Weller. Nano Lett.,2002, vol. 2, pp. 803-807.
21. Thiol-capping of CdTe nanocrystals: an alternative to organometallic synthetic routes. N. Gaponik, D. V. Talapin, A. L. Rogach, K. Hoppe, E. V. Shevchenko, A. Kornowski, A. Eychmüller, H. Weller. J. Phys. Chem. B, 2002, vol. 106; pp. 7177-7185.
20. Colloidal Crystals of Monodisperse FePt Nanoparticles Grown by a Three-Layer Technique of Controlled Oversaturation. E. V. Shevchenko, D. V. Talapin, A. Kornowski, F. Wiekhorst, J. Kötzler, M. Haase, A. L. Rogach, H. Weller. Adv. Mater. 2002, vol. 14, pp. 287-290.
19. Study of Optical Properties and Charge Transport in Nanocrystalline TiO2-In2O3 Composite Films. S. K. Poznyak, D. V. Talapin, A. I. Kulak. Thin Solid Films, 2002, vol. 405, pp. 35-41.
18. Anti-Stocks Photoluminescence in II-VI Colloidal Nanocrystals. Yu. P. Rakovich, S. A. Filonovich, M. J. M. Gomes, D. V. Talapin, A. L. Rogach, A. Eychmüller. phys. stat. sol. (b). 2002, no.1, vol.229, pp.449-452.
17. Dipole-Active Vibrations Confined in InP Quantum Dots. M. I. Vasilevskiy, A. G. Rolo, N. P. Gaponik, D. V. Talapin, A. L. Rogach, M. J. M. Gomes. Physica B, 2002, vol. 316-317, pp. 452-454.
16. Anti-Stocks Photoluminescence of CdTe Nanocrystals. Yu. P. Rakovich, A. A. Gladyschuk, K. I. Rusakov, S. A. Filonovich, M. J. M. Gomes, D. V. Talapin, A. L. Rogach, A. Eychmüller. Russ. J. Appl. Spectr.,2002, vol. 69, pp. 383-387.
15. Probing the Exciton Density of States in Semiconductor Nanocrystals Using Integrated Photoluminescence Spectroscopy. S. A. Filonovich, Yu. P. Rakovich, M. I. Vasilevskiy, M. V. Artemyev, D. V. Talapin, A. L. Rogach, A. G. Rolo, M. J. M. Gomes. Monatshefte für Chemie, 2002, vol. 133, pp. 909-918.
14. A New Approach to Crystallization of CdSe Nanoparticles in Ordered Three-Dimensional Superlattices. D. V. Talapin, E. V. Shevchenko, A. Kornowski, N. Gaponik, M. Haase, A. L. Rogach, H. Weller. Adv. Mater.2001, vol. 13, pp. 1868-1871.
13. Evolution of an Ensemble of Nanoparticles in a Colloidal Solution: Theoretical Study. D. V. Talapin, A. L. Rogach, M. Haase, H. Weller. J. Phys. Chem. B2001, vol. 105, pp. 12278-12285.
12. Highly Luminescent Monodisperse CdSe and CdSe/ZnS Nanocrystals Synthesized in a Hexadecylamine – Trioctylphosphine Oxide – Trioctylphospine Mixture. D. V. Talapin, A. L. Rogach, A. Kornowski, M. Haase, H. Weller. Nano Lett.2001, vol. 1, pp. 207-211.
11.A Novel Organometallic Synthesis of Highly Luminescent CdTe Nanocrystals. D. V. Talapin, S. Haubold, A. L. Rogach, A. Kornowski, M. Haase, H. Weller. J. Phys. Chem. B2001, vol. 105, pp. 2260-2263.
10. Harmonic Analysis of Pulsed Photovoltaic Response of Titanium Dioxide Films under Local Illumination. D. V. Talapin, D. V. Sviridov, A. I. Kulak. Russ. J. Electrochem.2001, vol. 37, no. 3, pp. 273-279.
9. Structural, Optical, and Photoelectrochemical Properties of Nanocrystalline TiO2-In2O3Composite Solids and Films Prepared by Sol-Gel Method. S. K. Poznyak, D. V. Talapin, A. I. Kulak. J. Phys. Chem. B, 2001, vol. 105, no. 21, pp. 4816-4823.
8. Chemically Grown II-VI Semiconductor Quantum Dots for Optoelectronic and Photonic Applications. N. P. Gaponik, D. V. Talapin, S. K. Poznyak, A. S. Susha, A. L. Rogach, A. Eychmüller. In: Physics, Chemistry, and Application of Nanostructures / ed. by V.E.Borisenko et al., World Scientific. Singapore. 2001. P.304-307.
7. Study of Semiconductor/Electrolyte Interface Using the Fourier Transformation of Photovoltage Response to Periodic Laser Pulses. D. V. Talapin, S. K. Poznyak, D. V. Sviridov and A. I. Kulak. Surf. Sci.2000, vol.454-456, pp. 1046-1051.
6. Harmonic Analysis of the Electrical Response of an n-TiO2/electrolyte Circuit to Periodic Laser Pulses.D. V. Talapin, D. V. Sviridov, A. I. Kulak. J. Electroanal. Chem. 2000, vol. 489, no. 1/2, pp. 28-37.
5. Electrochemical Synthesis of CdTe Nanocrystal/Polypyrrole Composites for Optoelectronic Applications. N. P. Gaponik, D. V. Talapin, A. L. Rogach, A. Eychmüller. J. Mater. Chem.2000, vol. 10, pp. 2163-2166.
4. A Light-Emitting Device Based on a CdTe Nanocrystal/Polyaniline Composite. N. P. Gaponik, D. V. Talapin, A. L. Rogach. Phys. Chem. Chem. Phys.1999, vol. 1, pp. 1787–1790.
3. Noise Signal Effect on Electrochemical Behaviour of Electrode System under Conditions of Kinetic Control. D. V. Talapin, A. I. Kulak, A. N. Golubev. Proc Acad. Sci. of Belarus (Chem. Sci.)1997, no.1, pp. 48-52.
2. Faradaic Rectification of Electric Noise Signals in Electrochemical Systems. D. V. Talapin, A. I. Kulak. Proc Acad. Sci. of Belarus (Chem. Sci.)1996, no.4, pp. 57-62.
1. Electrochemical Formation of Monolayer Films of Cadmium Sulfide on the Au Surface. E. A. Streltsov, I.I. Labarevich, D. V. Talapin. Dokl. Acad Nauk Belarus 1994, vol. 38, pp. 64-67 (in Russian).

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