A Chiral Reduced‐Dimension Perovskite for an Efficient Flexible Circularly Polarized Light Photodetector

Abstract

Chiral quasi‐2D perovskite single crystals (SCs) were investigated for their circular polarized light (CPL) detecting capability. Quasi‐2D chiral perovskites, [(R)‐β‐MPA]2MAPb2I7 ((R)‐β‐MPA=(R)‐(+)‐β‐methylphenethylamine, MA=methylammonium), have intrinsic chirality and the capability to distinguish different polarization states of CPL photons. Corresponding quasi‐2D SCs CPL photodetector exhibit excellent detection performance. In particular, our device responsivity is almost one order of magnitude higher than the reported 2D perovskite CPL detectors to date. The crystallization dynamics of the film were modulated to facilitate its carrier transport. Parallel oriented perovskite films with a homogeneous energy landscape is crucial to maximize the carrier collection efficiency. The photodetector also exhibits superior mechanical flexibility and durability, representing a promising candidate for sensitive and robust CPL photodetectors.

Circular dichroism in non-chiral metal halide perovskites

“…The growing attention to chiral materials is connected with their potential applications in the area of chiral optoelectronics and spintronics. Chirality is associated with the phenomenon of circular dichroism (CD) 2 since enantiomer pairs absorb left and right circularly polarized light differently [3][4][5][6][7] , and enantiomers can also emit circularly polarized light in the absence of an external magnetic field. [8][9][10] Recently chiral materials have been used in spintronic devices as a spin filters due to chiral-induced spin selectivity.…”

Building Supramolecular Chirality in Organic Solar Cells Enables High-Performing Circularly Polarized Light Detection

“…13). These values were one order of magnitude higher than those of the best reported quasi-2D perovskite CPL detectors (1.1 ×10 12 Jones) 15 recently as well as those of the commercialized Si photodiode (10 12 Jones) 37 . The detailed comparisons are presented in Supplementary Table 4.…”

“…The unique polarization state enables CPL to be applied to some cutting-edge science and technology breakthroughs, such as drug screening 5 , quantum optics 6,7 , optical communications 7 and imaging [8][9][10] . An intriguing topic closely associated with these issues is the sensitive discrimination of opposite handedness between l-and r-CPL by electronic devices [11][12][13][14][15][16][17][18] . However, the realization of CPL detection in inorganic photodetectors excessively relies on packaged lters consisting of quarter-wave plates and linear polarizers because of the inherent achiral property of inorganic semiconductors.…”

“…As such, direct CPL detection has greatly progressed by using electronic devices based on active materials with intrinsic chirality. These materials include organic conjugated small molecules and polymers 11,12,16,21 , hybrid organic-inorganic perovskite materials 14,15,18 and plasmonic metamaterials 22,23 . Among these materials, the potential of organic conjugated molecules has attracted great attentions in promoting the advancement of chiral optoelectronics, including e cient CPL detection and beyond.…”

An efficient and stable inverted perovskite solar cell involving inorganic charge transport layers without a high temperature procedure

“…The organic-inorganic metal halide perovskite solar cells (PSCs) have undergone rapid development and attracted extensive attention, with a power conversion efficiency (PCE) increasing from 3.8% up to the latest certied efficiency of 25.2% within 10 years. [1][2][3][4][5][6][7] The soaring of PCE has been achieved by various methods, such as compositional modication; improvement on the quality of the perovskite lm, and the development of highly efficient electron transport layers (ETLs). [8][9][10] Although the PCE has been enhanced, the poor stability of PSCs has prevented their commercialization.…”