Ultrasensitive Near‐Infrared Circularly Polarized Light Detection Using 3D Perovskite Embedded with Chiral Plasmonic Nanoparticles

RESEARCH ARTICLE www.advancedscience.com Ultrasensitive Near-Infrared Circularly Polarized Light Detection Using 3D Perovskite Embedded with Chiral Plasmonic Nanoparticles Hongki Kim, Ryeong Myeong Kim, Seok Daniel Namgung, Nam Heon Cho, Jung Bae Son, Kijoon Bang, Mansoo Choi, Seong Keun Kim, Ki Tae Nam, Jong Woo Lee,* and Joon Hak Oh* Chiral organic ligand-incorporated low-dimensional metal-halide perovskites have received increasing attention for next-generation photodetectors because of the direct detection capability of circularly polarized light (CPL), which overcomes the requirement for subsidiary optical components in conventional CPL photodetectors. However, most chiral perovskites have been based on low-dimensional structures that confine chiroptical responses to the ultraviolet (UV) or short-wavelength visible region and limit photocurrent due to their wide bandgap and poor charge transport. Here, chiroptical properties of 3D Cs0.05FA0.5MA0.45Pb0.5Sn0.5I3 polycrystalline films are achieved by incorporating chiral plasmonic gold nanoparticles (AuNPs) into the mixed Pb–Sn perovskite, without sacrificing its original optoelectronic properties. CPL detectors fabricated using chiral AuNP-embedded perovskite films can operate without external power input; they exhibit remarkable chirality in the near-infrared (NIR) region with a high anisotropy factor of responsivity (gres) of 0.55, via giant plasmon resonance shift of chiral plasmonic AuNPs. In addition, a CPL detector array fabricated on a plastic substrate demonstrates highly sensitive self-powered NIR detection with superior flexibility and durability. H. Kim, J. H. Oh School of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea E-mail: joonhoh@snu.ac.kr H. Kim Department of Chemical Engineering Pohang University of Science and Technology (POSTECH) Pohang 37673, Republic of Korea The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/advs.202104598 © 2022 The Authors. Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. DOI: 10.1002/advs.202104598 1. Introduction Chiral materials that are distinguishable from their mirror images typically exhibit nonlinear optical responses to circularly polarized light (CPL), where the electric vector with a constant magnitude rotates in a plane perpendicular to the propaga- tion direction with a steady angular veloc- ity. The incident left-handed circularly po- larized light (LCPL) or right-handed circu- larly polarized light (RCPL) can induce dif- ferentiated circulation of electronic charges (i.e., helical redistribution) in chiral ma- terials, resulting in different degrees of light absorption.[1–3] Because this function reflects intrinsic opto-physical and chemi- cal information regarding materials,[4,5] di- rectly distinguishing between the two po- larizations of CPL without subsidiary opti- cal components (e.g., linear polarizer and quarter-wave plate) enables miniaturiza- tion of the integrated device at a low cost and has considerable potential in many J. W. Lee Department of Chemistry Myongji University 116 Myongji-ro, Yongin, Gyeonggi-do 17058, Republic of Korea E-mail: promise@mju.ac.kr R. M. Kim, S. D. Namgung, N. H. Cho, K. T. Nam Department of Materials Science and Engineering Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea J. B. Son, S. K. Kim Department of Chemistry Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea K. Bang, M. Choi Department of Mechanical and Aerospace Engineering Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea Adv. Sci. 2022, 9, 2104598 © 2022 The Authors. Advanced Sci