Self-Powered Circularly Polarized Light Detection Enabled by Chiral Two-Dimensional Perovskites with Mixed Chiral-Achiral Organic Cations.
basic_science · Level V
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- Record sourced from PubMed, PMID 38771979.
- Also identified by DOI 10.1021/acsnano.4c02588.
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Abstract
Direct detection of circularly polarized light (CPL) holds great promise for the development of various optical technologies. Chiral 2D organic-inorganic halide perovskites make it possible to fabricate CPL-sensitive photodetectors. However, selectively detecting left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) light remains a significant challenge. Herein, we demonstrate a greatly enhanced distinguishability of photodiode-type CPL photodetectors based on chiral 2D perovskites with mixed chiral aryl (R)-(+),(S)-(-)-α-methylbenzylammonium (R,S-MBA) and achiral alkyl <i>n</i>-butylammonium (<i>n</i>BA) cations. The (R,S-MBA<sub>0.5</sub><i>n</i>BA<sub>0.5</sub>)<sub>2</sub>PbI<sub>4</sub> perovskites exhibit a 10-fold increase in circular dichroism signals compared to (R,S-MBA)<sub>2</sub>PbI<sub>4</sub> perovskites. The CPL photodetectors based on the mixed-cation perovskites exhibit self-powered capabilities with a specific detectivity of 2.45 × 10<sup>12</sup> Jones at a 0 V bias. Notably, these devices show high distinguishability (<i>g</i><sub>res</sub>) factors of -0.58 and +0.54 based on (R,S-MBA<sub>0.5</sub><i>n</i>BA<sub>0.5</sub>)<sub>2</sub>PbI<sub>4</sub> perovskites, respectively, surpassing the performance of (R-MBA)<sub>2</sub>PbI<sub>4</sub>-based devices by over 3-fold and setting a record for CPL detectors based on chiral 2D <i>n</i> = 1 perovskites.