Source: http://aoot.osa.org/ome/abstract.cfm?uri=ome-9-4-1738
Timestamp: 2019-04-19 02:47:13+00:00

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We report on the synthesis and systematic investigation of quantum dot based optical gain material potentially suitable for applications in active devices operating around a wavelength of 1.55 µm and above. The quantum dots were selectively grown in a process assisted by block-copolymer lithography. We applied a new type of diblock copolymer, PS-b-PDMS (polystyrene-block-polydimethylsiloxane), which allows for the direct fabrication of a silicon oxycarbide hard mask used for lithography. Arrays of InAs/InP quantum dots were selectively grown via droplet epitaxy. Our detailed optical investigations of the quantum dot carrier dynamics in the 10-300 K temperature range indicate the presence of a significant density of defect states located within the InP bandgap and in the vicinity of the quantum dots. Those defects have a substantial impact on the optical properties of the quantum dots.
A. Markus, J. X. Chen, C. Paranthoën, A. Fiore, C. Platz, and O. Gauthier-Lafaye, “Simultaneous two-state lasing in quantum-dot lasers,” Appl. Phys. Lett. 82(12), 1818–1820 (2003).
Y. Arakawa and H. Sakaki, “Multidimensional quantum well laser and temperature dependence of its threshold current,” Appl. Phys. Lett. 40(11), 939–941 (1982).
G. Park, O. B. Shchekin, D. L. Huffaker, and D. G. Deppe, “Low-threshold oxide-confined 1.3-μm quantum-dot laser,” IEEE Photonics Technol. Lett. 12(3), 230–232 (2000).
O. B. Shchekin, J. Ahn, and D. G. Deppe, “High temperature performance of self-organised quantum dot laser with stacked p-doped active region,” Electron. Lett. 38(14), 712 (2002).
A. E. Zhukov, A. R. Kovsh, S. S. Mikhrin, A. P. Vasil’ev, E. S. Semenova, N. A. Maleev, V. M. Ustinov, M. M. Kulagina, E. V. Nikitina, I. P. Soshnikov, Y. M. Shernyakov, D. A. Livshits, N. V. Kryjanovskaya, D. S. Sizov, M. V. Maximov, A. F. Tsatsul’nikov, N. N. Ledentsov, D. Bimberg, and Z. I. Alferov, “High external differential efficiency and high optical gain of long-wavelength quantum dot diode laser,” Phys. E 17, 589–592 (2003).
T. Akiyama, M. Sugawara, and Y. Arakawa, “Quantum-Dot Semiconductor Optical Amplifiers,” Proc. IEEE 95(9), 1757–1766 (2007).
K. Yvind, D. Larsson, J. Mørk, J. M. Hvam, M. Thompson, R. Penty, and I. White, “Low-noise monolithic mode-locked semiconductor lasers through low-dimensional structures,” in A. A. Belyanin and P. M. Smowton, eds. (2008), p. 69090A.
A. Kovsh, A. Gubenko, I. Krestnikov, D. Livshits, S. Mikhrin, J. Weimert, L. West, G. Wojcik, D. Yin, C. Bornholdt, N. Grote, M. V. Maximov, and A. Zhukov, “Quantum dot comb-laser as efficient light source for silicon photonics,” in G. C. Righini, S. K. Honkanen, L. Pavesi, and L. Vivien, eds. (International Society for Optics and Photonics, 2008), Vol. 6996, p. 69960 V.
T. W. Berg and J. Mørk, “Theoretical analysis of quantum dot amplifiers with high saturation power and low noise figure,” in ECOC 2002 Proceedings (IEEE, 2002), Vol. 2, pp. 1–2.
T. W. Berg and J. Mørk, “Quantum dot amplifiers with high output power and low noise,” Appl. Phys. Lett. 82(18), 3083–3085 (2003).
R. Wang, A. Stintz, and P. Varangis, “Room-temperature operation of InAs quantum-dash lasers on InP,” IEEE Photonics Technol. Lett. 13(8), 767–769 (2001).
E. S. Semenova, I. V. Kulkova, S. Kadkhodazadeh, M. Schubert, R. E. Dunin-Borkowski, and K. Yvind, “InAs/InGaAsP Quantum Dots Emitting at 1.5 μm for Applications in Lasers,” Conf. Proc. - Int. Conf. Indium Phosphide Relat. Mater. IEEE (2011).
Y. Yu, W. Xue, E. Semenova, K. Yvind, and J. Mork, “Demonstration of a self-pulsing photonic crystal Fano laser,” Nat. Photonics 11(2), 81–84 (2017).
W. Xue, Y. Yu, L. Ottaviano, Y. Chen, E. Semenova, K. Yvind, and J. Mork, “Threshold Characteristics of Slow-Light Photonic Crystal Lasers,” Phys. Rev. Lett. 116(6), 063901 (2016).
D. Miller, “Device Requirements for Optical Interconnects to Silicon Chips,” Proc. IEEE 97(7), 1166–1185 (2009).
B. Ellis, M. A. Mayer, G. Shambat, T. Sarmiento, J. Harris, E. E. Haller, and J. Vučković, “Ultralow-threshold electrically pumped quantum-dot photonic-crystal nanocavity laser,” Nat. Photonics 5(5), 297–300 (2011).
M. T. Hill and M. C. Gather, “Advances in small lasers,” Nat. Photonics 8(12), 908–918 (2014).
Y. D. Galeuchet, R. Hugo, and P. Roentgen, “MOVPE on patterned substrates: a new fabrication method for nanometer structure devices,” Microelectron. Eng. 15(1-4), 667–670 (1991).
T. Fukui, S. Ando, Y. Tokura, and T. Toriyama, “GaAs tetrahedral quantum dot structures fabricated using selective area metalorganic chemical vapor deposition,” Appl. Phys. Lett. 58(18), 2018–2020 (1991).
R. A. Segalman, “Patterning with block copolymer thin films,” Mater. Sci. Eng., R 48(6), 191–226 (2005).
H. Yoshida and M. Takenaka, “Physics of block copolymers from bulk to thin films,” in Directed Self-Assembly of Block Co-Polymers for Nano-Manufacturing (Elsevier, 2015), pp. 3–26.
I. W. Hamley, “Ordering in thin films of block copolymers: Fundamentals to potential applications,” Prog. Polym. Sci. 34(11), 1161–1210 (2009).
J. H. Park, C.-C. Liu, M. K. Rathi, L. J. Mawst, P. F. Nealey, and T. F. Kuech, “Nanoscale selective growth and optical characteristics of quantum dots on III-V substrates prepared by diblock copolymer nanopatterning,” J. Nanophotonics 3(1), 031604 (2009).
E. S. Semenova, I. V. Kulkova, S. Kadkhodazadeh, D. Barettin, O. Kopylov, A. Cagliani, K. Almdal, M. Willatzen, and K. Yvind, “Epitaxial growth of quantum dots on InP for device applications operating at the 1.55 μm wavelength range,” Proc. SPIE 8996, 899606 (2014).
H. Kim, J. Choi, Z. Lingley, M. Brodie, Y. Sin, T. F. Kuech, P. Gopalan, and L. J. Mawst, “Selective growth of strained (In)GaAs quantum dots on GaAs substrates employing diblock copolymer lithography nanopatterning,” J. Cryst. Growth 465, 48–54 (2017).
H. Kim, W. Wei, T. F. Kuech, P. Gopalan, and L. J. Mawst, “Quantum Dot Laser Diodes emitting 1 . 57 ∼ 1 . 67μm at room temperature grown by Block Copolymer Lithography and Selective Area MOCVD,” 2018 IEEE Int. Semicond. Laser Conf.63–64 (2018).
Y. S. Jung and C. A. Ross, “Solvent-Vapor-Induced Tunability of Self-Assembled Block Copolymer Patterns,” Adv. Mater. 21(24), 2540–2545 (2009).
K. W. Gotrik, A. F. Hannon, J. G. Son, B. Keller, A. Alexander-Katz, and C. A. Ross, “Morphology Control in Block Copolymer Films Using Mixed Solvent Vapors,” ACS Nano 6(9), 8052–8059 (2012).
T. Li, Z. Wang, L. Schulte, and S. Ndoni, “Substrate tolerant direct block copolymer nanolithography,” Nanoscale 8(1), 136–140 (2016).
C. Dion, P. Desjardins, N. Shtinkov, F. Schiettekatte, P. J. Poole, and S. Raymond, “Effects of grown-in defects on interdiffusion dynamics in InAs/InP(001) quantum dots subjected to rapid thermal annealing,” J. Appl. Phys. 103(8), 083526 (2008).
T. Li, Z. Wang, L. Schulte, O. Hansen, and S. Ndoni, “Fast & scalable pattern transfer via block copolymer nanolithography,” RSC Adv. 5(124), 102619 (2015).
A. P. Smith, J. F. Douglas, J. C. Meredith, E. J. Amis, and A. Karim, “Combinatorial Study of Surface Pattern Formation in Thin Block Copolymer Films,” Phys. Rev. Lett. 87(1), 015503 (2001).
T. Li, “Functional materials derived from block copolymer self-assembly,” PhD thesis, DTU Nanotech (2015).
S. Arakawa, M. Ito, R. Nakasaki, and A. Kasukawa, “Improvement of MOCVD Growth Technique Using CBr4,” Furukawa Rev.76–81 (2003).
N. Kuznetsova, I. V. Kulkova, E. S. Semenova, S. Kadhodazadeh, N. V. Kryzhanovskaya, A. E. Zhukov, and K. Yvind, “Crystallographic dependent in-situ CBr4 selective nano-area etching and local regrowth of InP/InGaAs by MOVPE,” J. Cryst. Growth 406, 111–115 (2014).
M. Gong, K. Duan, C.-F. Li, R. Magri, G. A. Narvaez, and L. He, “Electronic structure of self-assembled In As/InP quantum dots: Comparison with self-assembled In As/GaAs quantum dots,” Phys. Rev. B 77(4), 045326 (2008).
M. A. Reshchikov, “Temperature dependence of defect-related photoluminescence in III-V and II-VI semiconductors,” J. Appl. Phys. 115(1), 012010 (2014).
R. Mishra, O. D. Restrepo, A. Kumar, and W. Windl, “Native point defects in binary InP semiconductors,” J. Mater. Sci. 47(21), 7482–7497 (2012).
D. Ko, X. W. Zhao, K. M. Reddy, O. D. Restrepo, R. Mishra, T. R. Lemberger, I. S. Beloborodov, N. Trivedi, N. P. Padture, W. Windl, F. Y. Yang, and E. Johnston-Halperin, “Defect states and disorder in charge transport in semiconductor nanowires,” J. Appl. Phys. 114(4), 043711 (2013).
H. Kurtze, J. Seebeck, P. Gartner, D. R. Yakovlev, D. Reuter, A. D. Wieck, M. Bayer, and F. Jahnke, “Carrier relaxation dynamics in self-assembled semiconductor quantum dots,” Phys. Rev. B 80(23), 235319 (2009).
M. Syperek, J. Andrzejewski, E. Rogowicz, J. Misiewicz, S. Bauer, V. I. Sichkovskyi, J. P. Reithmaier, and G. Sȩk, “Carrier relaxation bottleneck in type-II InAs/InGaAlAs/InP(001) coupled quantum dots-quantum well structure emitting at 1.55 μ m,” Appl. Phys. Lett. 112(22), 221901 (2018).
E. Péronne, F. Fossard, F. H. Julien, J. Brault, M. Gendry, B. Salem, G. Bremond, and A. Alexandrou, “Dynamic saturation of an intersublevel transition in self-organized InAs/InxAl1 − x As quantum dots,” Phys. Rev. B 67(20), 205329 (2003).
P. Miska, J. Even, O. Dehaese, and X. Marie, “Carrier relaxation dynamics in InAs/InP quantum dots,” Appl. Phys. Lett. 92(19), 191103 (2008).
M. Syperek, Ł. Dusanowski, J. Andrzejewski, W. Rudno-Rudziński, G. Sȩk, J. Misiewicz, and F. Lelarge, “Carrier relaxation dynamics in InAs/GaInAsP/InP(001) quantum dashes emitting near 1.55 μm,” Appl. Phys. Lett. 103(8), 083104 (2013).
M. Gong, W. Zhang, G. Can Guo, and L. He, “Atomistic pseudopotential theory of optical properties of exciton complexes in InAs/InP quantum dots,” Appl. Phys. Lett. 99(23), 231106 (2011).
M. Gawełczyk, M. Syperek, A. Maryński, P. Mrowiński, Ł. Dusanowski, K. Gawarecki, J. Misiewicz, A. Somers, J. P. Reithmaier, S. Höfling, and G. Sęk, “Exciton lifetime and emission polarization dispersion in strongly in-plane asymmetric nanostructures,” Phys. Rev. B 96(24), 245425 (2017).
K. Mukai, N. Ohtsuka, and M. Sugawara, “High photoluminescence efficiency of InGaAs/GaAs quantum dots self-formed by atomic layer epitaxy technique,” Appl. Phys. Lett. 70(18), 2416–2418 (1997).
M. Syperek, M. Baranowski, G. Sȩk, J. Misiewicz, A. Löffler, S. Höfling, S. Reitzenstein, M. Kamp, and A. Forchel, “Impact of wetting-layer density of states on the carrier relaxation process in low indium content self-assembled (In,Ga)As/GaAs quantum dots,” Phys. Rev. B 87(12), 125305 (2013).
Fig. 1. Schematic illustration of the mask fabrication and QD growth process.
Fig. 2. SEM image of SiOxCy hard mask.
Fig. 3. (a) InP surface defects formed underneath the SiOxCy mask after 650 °C annealing. (b) The same sample after the mask is removed. The red arrows indicate the crystallographic orientations.
Fig. 4. (a) Temperature dependence of PL emission from SAG InAs/InP QDs (Eexc = 1.48 eV, Pexc ≈ 5.5 W/cm−2). Inset: PL emission from the InP barrier and the laser spectrum at T = 10 K. (b) Temperature PL quenching for QDs measured under high/low excitation power above InP barrier (red and blue squares) and below InP barrier excitation under low excitation power (green squares), and the PL quench for InP barrier under low excitation power (black squares). These dependences are arbitrary shifted on the intensity scale for better visibility. (c) The Full-Width-at-Half-Maximum (FWHM) parameter for the QDs PL band for two optical pumping powers.
Fig. 5. (a) Time-resolved photoluminescence (TRPL) traces for selective-area growth InAs/InP QDs at various temperatures. (b) TRPL traces at their initial time-period after photo-excitation. (c) Dispersion of photoluminescence decay times at various temperatures, (d) dispersion of photoluminescence rise times as a function of temperature.
Table 1. Parameters of the PL thermal quenching.
Parameters of the PL thermal quenching.

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