Wang Haoyu, Yao Lunjia, Zhan Yuzhuo, Yu He, Wu Shuanghong, Liu Xiaodong
School of Optoelectronic Engineering, Changchun University of Science and Technology (CUST), Changchun 130013, PR China.
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China.
ACS Appl Mater Interfaces. 2025 Jan 15;17(2):3716-3724. doi: 10.1021/acsami.4c18208. Epub 2024 Dec 31.
Low-dimensional hybrid organic-inorganic perovskites (HOIPs) containing chiral organic ligands have recently emerged as promising candidates for circularly polarized light (CPL) detection, which can distinguish left- and right-handed CPL directly. However, the increase in responsivity and realization of self-powered CPL photodetector remain a challenge. Meanwhile, there is a trade-off between the photocurrent responsivity and the ability to differentially absorb CPL in detectors based on these low-dimensional perovskites. Herein, we report the CPL photodetector based on chiral quasi-2D perovskite films (S/R-MBA)MAPbI and propose a crystallization regulation method using dimethyl sulfoxide (DMSO) and methylammonium thiocyanate (MASCN). We found that the photoelectric response capability and circular dichroism (CD) intensities of chiral quasi-2D perovskite can be enhanced simultaneously by the improved crystallinity and surface morphology of chiral films. Meanwhile, the formation of the tetragonal perovskite structure leads to symmetry-breaking distortion of the inorganic frameworks, further enhancing the chirality of the perovskite films. In addition, the distribution of -phase can be tuned by DMSO and MASCN to form graded band alignment, effectively promoting the charge transfer in perovskite. As a result, a self-powered CPL photodetector with a high responsivity of 0.82 A/W and an anisotropy factor of 0.09 at 0 V bias is obtained. To the best of our knowledge, it is the first attempt to enhance the CD characteristics of chiral quasi-2D perovskite films. We believe our work further advances the research of low-dimensional chiral perovskite films in the field of CPL detection.
含有手性有机配体的低维有机-无机杂化钙钛矿（HOIPs）最近成为圆偏振光（CPL）检测的有前途的候选材料，它可以直接区分左旋和右旋CPL。然而，提高响应度和实现自供电CPL光电探测器仍然是一个挑战。同时，在基于这些低维钙钛矿的探测器中，光电流响应度和差分吸收CPL的能力之间存在权衡。在此，我们报道了基于手性准二维钙钛矿薄膜（S/R-MBA）MAPbI的CPL光电探测器，并提出了一种使用二甲基亚砜（DMSO）和甲基硫氰酸铵（MASCN）的结晶调控方法。我们发现，通过改善手性薄膜的结晶度和表面形貌，可以同时提高手性准二维钙钛矿的光电响应能力和圆二色性（CD）强度。同时，四方钙钛矿结构的形成导致无机框架的对称性破缺畸变，进一步增强了钙钛矿薄膜的手性。此外，可以通过DMSO和MASCN调节β相的分布，形成渐变能带排列，有效促进钙钛矿中的电荷转移。结果，获得了一种自供电CPL光电探测器，在0 V偏压下具有0.82 A/W的高响应度和0.09的各向异性因子。据我们所知，这是首次尝试增强手性准二维钙钛矿薄膜的CD特性。我们相信我们的工作进一步推动了低维手性钙钛矿薄膜在CPL检测领域的研究。
