Search query: Chiral perovskite photodector

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abstract: Organic inorganic hybrid halide perovskites (OIHPs) are commonly used as prototypical materials for various applications, including photovoltaics, photodetectors, and light emitting devices. Since the chiroptical properties of OIHPs are deciphered in 2017, chiral OIHPs have been rediscovered as new hybrid systems comprising chiral organic molecules and achiral inorganic octahedral layers. Owing to their exceptional optoelectrical properties and structural flexibility, chiral OIHPs have received a considerable amount of attention in chiral photonics, chiroptoelectronics, spintronics, and ferroelectrics. Despite their intriguing chiral properties, the transfer mechanism from chiral molecules to achiral semiconductors has not been extensively investigated. Furthermore, an in depth understanding of the origin of chiroptical activity is still elusive. In this review article, recent advances in the chiroptical activities of chiral OIHPs and polarization based devices adopting chiral OIHPs are comprehensively discussed, and insight into the underlying chirality transfer mechanism based on theoretical considerations is provided. This comprehensive survey, with an emphasis on the chirality transfer mechanism, will help readers understand the chiroptical properties of OIHPs, which are crucial for the development of spin based photonic and optoelectronic devices. Additionally, promising strategies to exploit the potential of chiral OIHPs are also discussed.
author_names: Sunihl Ma

Jihoon Ahn

Jooho Moon
title: Chiral Perovskites for Next Generation Photonics: From Chirality Transfer to Chiroptical Activity.
venue: Advanced materials
year: 2021

abstract: Two dimensional (2D) hybrid halide perovskites with single chiral and ferroelectricity together with various structural phase transitions provide the possibility for them to have more diverse functional properties. Here, we present a 2D chiral hybrid halide perovskite ferroelectric, [C 6 H 5 (CH 2 4 NH 3 2 CdCl 4 4PBA CdCl 4 4PBA 4 Phenylbutylamine) which experiences two continuous phase transitions from centrosymmetric triclinic P to polar chiral monoclinic P 2 and then to another centrosymmetric tetragonal P 4 /mmm with increasing temperature, accompanied by symmetry breaking, due to the prominent octahedral distortion and disorder transformation of organic 4PBA cations. Under polar chiral phase, 4PBA CdCl 4 exhibits a significant CD signal and a moderate ferroelectric polarization of 0.35 mC/cm 2 In addition, 4PBA CdCl 4 occupies a wide band gap of 4.376 eV and is chiefly contributed by inorganic CdCl 6 octahedron. This finding offers an alternative pathway for designing new phase transitions and related physical properties in hybrid halide perovskites and other hybrid crystals.
author_names: Lin Sui Li

Wen Juan Wei

Hong Qiang Gao

Yu Hui Tan

Xiao Bo Han
title: Molecular Disorder Induces Unusual Phase Transition in a Potential 2D Chiral Ferroelectric Perovskite.
venue: Chemistry
year: 2021

abstract: The control of the optoelectronic properties of 2D organic inorganic hybrid perovskite (2D OIHP) lead halides is an increasingly prevalent topic. Herein, the observation of the circular photogalvanic effect (CPGE) in new enantiomorphic 2D OIHP lead iodides is reported, which are synthesized as a first OIHP related system belonging to a chiral space group by incorporating organic chiral cations into the inorganic layers of lead iodides. The CPGE is an optoelectronic phenomenon associated with the spin orbit coupling of heavy atoms in noncentrosymmetric systems. Owing to the CPGE, light helicity dependent steady photocurrents are generated without an external bias voltage under the irradiation of circularly polarized light. Furthermore, the sign reversal of the CPGE photocurrent depending on the chirality of the designed 2D OIHP lead iodides is observed. This result indicates formation of the theoretically predicted radial spin polarized texture in k space of chiral systems owing to spin momentum locking. Hence, chiral 2D OIHP lead halides can be a promising platform for engineering opto spintronic functionalities.
author_names: Po-Jung Huang

Kouji Taniguchi

Masato Shigefuji

Takatsugu Kobayashi

Masakazu Matsubara

Takao Sasagawa

Hiroyasu Sato

Hitoshi Miyasaka
title: Chirality Dependent Circular Photogalvanic Effect in Enantiomorphic 2D Organic Inorganic Hybrid Perovskites.
venue: Advanced materials
year: 2021

abstract: Chiral perovskites with circularly polarized luminescence (CPL) performance have attracted tremendous attention. This contribution reports a convenient and universal strategy for constructing chiral helical polymer/perovskite hybrid nanofibers with outstanding CPL properties. The hybrid nanofibers are prepared through a one step electrospinning method in which chiral helical polyacetylenes, perovskite nanocrystals, and polyacrylonitrile serve as a handed selective fluorescence filter, fluorescent source, and electrospinning matrix, respectively. Specially, perovskite nanocrystals are in situ formed during the electrospinning process, which avoids the tedious process for preparing and purifying perovskites. The prepared hybrid nanofibers all exhibit good long time stability in air, owing to the effective protection effect of polymer matrix. More importantly, intense CPL emissions with high dissymmetry factor up to 10 2 level are obtained in the hybrid nanofibers. Furthermore, the emission color of CPL can be easily tuned by adjusting the precursors of perovskites. This work provides an efficient technique toward various kinds of CPL active perovskite nanomaterials for both scientific research and future practical applications.
author_names: Biao Zhao

Kai Pan

Jianping Deng
title: Chiral Helical Polymer/Perovskite Hybrid Nanofibers with Intense Circularly Polarized Luminescence.
venue: ACS nano
year: 2021

abstract: Spin injection sans magnetism Light emitting diodes (LEDs) that emit circularly polarized light (spin LEDs) have potential applications in in three dimensional displays, bioencoding, and tomography. The requisite spin polarization of the charge carriers is usually achieved with ferromagnetic contacts and applied magnetic fields, but Kim et al. report on a room temperature spin LED that relies instead on a chiral induced spin selectivity organic layer. This layer selectively injected spin polarized holes into metal halide perovskite nanocrystals, where they radiatively recombined with unpolarized electrons with an efficiency of 2.6% Science, this issue p. 1129 Spin polarized light emitting diodes based on metal halide perovskites operate at room temperature without a magnetic field. In traditional optoelectronic approaches, control over spin, charge, and light requires the use of both electrical and magnetic fields. In a spin polarized light emitting diode (spin LED) charges are injected, and circularly polarized light is emitted from spin polarized carrier pairs. Typically, the injection of carriers occurs with the application of an electric field, whereas spin polarization can be achieved using an applied magnetic field or polarized ferromagnetic contacts. We used chiral induced spin selectivity (CISS) to produce spin polarized carriers and demonstrate a spin LED that operates at room temperature without magnetic fields or ferromagnetic contacts. The CISS layer consists of oriented, self assembled small chiral molecules within a layered organic inorganic metal halide hybrid semiconductor framework. The spin LED achieves 2.6% circularly polarized electroluminescence at room temperature.
author_names: Young-Hoon Kim

Yaxin Zhai

Haipeng Lu

Xin Pan

Chuanxiao Xiao

E Ashley Gaulding

Steven P Harvey

Joseph J Berry

Zeev Valy Vardeny

Joseph M Luther

Matthew C Beard
title: Chiral induced spin selectivity enables a room temperature spin light emitting diode
venue: Science
year: 2021

abstract: Chiral perovskite materials have been intensively studied because of their unique properties and wide range of potential applications; however, the synthesis of perovskite nanocrystals with improved chirality has been scarcely investigated. In this Letter, two dimensional perovskite nanosheets with intrinsic chirality are demonstrated. Inserting chiral amines into the perovskite framework leads to the chirality transfer from amine molecules to perovskite structure. The protecting agent, specifically, achiral octylamine, is found to influence the chiral optical signal or dissymmetric factor of nanosheets significantly. By controlling the amount of octylamine, we have synthesized perovskite nanosheets with the highest g factor ever reported. We expect our primary demonstration could attract more attention toward the synthesis of intrinsic chiral perovskite nanocrystals and the development of nanocrystal based chiral optical devices with improved functions.
author_names: He Ren

Yue Wu

Chenchen Wang

Yong Yan
title: 2D Perovskite Nanosheets with Intrinsic Chirality.
venue: The journal of physical chemistry letters
year: 2021

abstract: The layered perovskite YBaCuFeO5 (YBCFO) is considered one of the best candidates to high temperature chiral multiferroics with strong magnetoelectric coupling. In RBaCuFeO5 perovskites (R: rare earth or Y) A site cations are fully ordered whereas their magnetic properties strongly depend on the preparation process. They exhibit partial cationic disorder at the B site that generates a magnetic spiral stabilized through directionally assisted long range coupling between canted locally frustrated spins. Moreover the orientation of its magnetic spiral can be critical for the magnetoelectric response of this chiral magnetic oxide. We have synthesized and studied YBaCuFe1 xMnxO5 samples doped with Mn, with the aim of increasing spin orbit coupling effects, and found that the overall Fe/Cu cation disorder at the B sites can be increased by doping without changing the sample preparation process. In YBaCuFe1 xMnxO5 samples prepared under the same conditions, the T x magnetic phase diagram have been constructed in the range 10K 500K combining magnetometry, X ray and neutron powder diffraction measurements. The tilting angles of the spins in the collinear, \theta}col and spiral phases, \theta}spiral, barely vary with temperature. In the collinear phase \theta}col is also independent of the Mn content. In contrast, the presence of Mn produces a progressive reorientation of the plane of the magnetic helix in the incommensurate phase, capable to transform the helicoidal spin ordering into a cycloidal one, which may critically determine the ferroelectric and magnetoelectric behavior in these compounds. Some of the observations are of interest for engineering and developing this family of potential high temperature multiferroics.
author_names: Arnau Romaguera

Oscar Fabelo

Francois Fauth

Javier Herrero-Martin

Jose Luis Garcia-Munoz
title: Tuning the tilting of the spiral plane by Mn doping in YBaCuFeO5 multiferroic
year: 2021

abstract: Chiral perovskites have emerged as a significant class of materials showing promising optoelectronic and spintronic applications. Reports of chiral perovskite ferroelectrics, however, have been scarce. In this work, we have successfully synthesized homochiral lead iodide perovskite ferroelectrics (R) N (1 phenylethyl)ethane 1,2 diaminium]PbI4 and (S) N (1 phenylethyl)ethane 1,2 diaminium]PbI4 by the chemical design of introducing a methyl group into the organic cation of the parent (N benzylethane 1,2 diaminium)PbI4. Vibrational circular dichroism spectra identify the chiral mirroring relationship. They both undergo 222F2 type paraelectric ferroelectric behavior at around 378 K coupled with clear ferroelastic domains "ON/OFF" switching. Besides, they exhibit an evident thermochromism with color change from orange yellow to orange red. To our knowledge, the discovery of integrated ferroelectricity, ferroelasticity and reversible thermochromism in chiral perovskites is unprecedented. This finding offers a resultful path to design chiral perovskite ferroelectrics and is of great inspiration to the discovery of multifunctional perovskite materials.
author_names: Yu-Ling Zeng

Xue-Qin Huang

Chao-Ran Huang

Hua Zhang

Fang Wang

Zhongxia Wang
title: Unprecedented 2D Homochiral Hybrid Lead Iodide Perovskite Thermochromic Ferroelectrics with Ferroelastic Switching.
venue: Angewandte Chemie
year: 2021

abstract: Low dimensional hybrid organic inorganic perovskites (HOIPs) possess more localized electronic states and narrower conduction and valence bands to promote self trapping of excitons and stronger exciton emission; therefore, they are widely used as building blocks for various applications in the fields of optoelectronics, photovoltaics, light emitting diodes, luminescence, fluorescence, and so forth. Despite the past decades of intensive study, the discovered low dimensional chiral HOIPs are rare as of the 1D chiral HOIP single crystals reported in 2003, as well as the low dimensional chiral HOIP ferroelectrics are particularly scarce since the first chiral two dimensional (2D) and/or one dimensional (1D) HOIP ferroelectrics reported. Herein, two new low dimensional HOIPs with the same conformational formula [R MPA]2CdCl4 (R MPA+ (R) 1 methyl 3 phenylpropylamine) were successfully synthetized by means of regulating the stoichiometric proportion of R MPA and CdCl2 in two ways of 1:1 (1) and 2:1 (2) By combining single crystal X ray diffraction, circular dichroism (CD) spectroscopy, differential scanning calorimetry, temperature dependent dielectric constant, temperature dependent second harmonic generation (SHG) effect, polarization dependent SHG response, and P E hysteresis loop, we reveal that 1 is a 1D nonchiral molecular ferroelectric and 2 is the first zero dimensional (0D) chiral ferroelectric with distinct CD signals; meanwhile, 2 exhibits increased properties of high Tc, large dielectric constant, SHG isotropy, and ferroelectricity than that of 1. These results not only shed light on the high tunability of the low dimensional HOIP ferroelectrics but also open up an avenue to explore multifunctional chiral ferroelectrics.
author_names: Lin-Sui Li

Yu-Hui Tan

Wen-Juan Wei

Hongqiang Gao

Yun-Zhi Tang

Xiao-Bo Han
title: Chiral Switchable Low Dimensional Perovskite Ferroelectrics.
venue: ACS applied materials interfaces
year: 2020

abstract: Metal halide perovskites are recently emerging as the promising alternative for CPL detection owing to their CPL sensitive property induced by chiral organics and efficient charge transport of inorganic frameworks. However, most of these reported chiral perovskites involve high concentrations of toxic Pb which will become the potential bottleneck for their further application. Herein, we successfully developed two lead free halide double perovskites, R b MPA] 4 AgBiI 8 R b MPA R b methylphenethylammonium, 1 R and S b MPA] 4 AgBiI 8 S b MPA S b methylphenethylammonium, 1 S Circular dichroism measurements reveal that these perovskites exhibit notable chirality induced by organic cations to distinguish different polarization states of CPL photons. Significantly, they present unique chiral polar photovoltaic, and resulting self powered CPL detection without an external power source is unprecedentedly achieved. Furthermore, an anisotropy factor up to 0.3 is acquired for the self powered CPL detection, reaching the highest value among reported chiral perovskites. This work suggests hybrid double perovskites are promising photoelectronic candidates, and provides a new approach for exploring new "green" circularly polarized light sensitive materials with high perfromance
author_names: Dong Li

Xitao Liu

Wentao Wu

Yunyan Peng

Sangen Zhao

Lina Li

Maochun Hong

Junhua Luo
title: Chiral lead free hybrid perovskites for self powered circularly polarized light detection.
venue: Angewandte Chemie
year: 2020