Hu Xinxin, Xu Haojie, Liu Yi, Lu Lei, Guo Wuqian, Han Shiguo, Luo Junhua, Sun Zhihua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
J Phys Chem Lett. 2022 Jul 7;13(26):6017-6023. doi: 10.1021/acs.jpclett.2c01435. Epub 2022 Jun 24.
Two-dimensional (2D) hybrid perovskites with intrinsic attributes of structural and optical anisotropy are holding a bright promise for polarization-sensitive photodetection. However, studies on self-powered detection to quite weak polarized light remain scarce in this 2D family. By incorporating an aromatic spacer into the 3D cubic prototype, we have successfully assembled a new 2D hybrid perovskite with a polar motif, (FPEA)(MA)PbI (, where FPEA is 4-fluorophenethylammonium and MA is methylammonium). Its unique 2D quantum-well structure allows optical absorption dichroism with a large ratio of ∼3.15, and the natural polarity results in a notable bulk photovoltaic effect. Further, centimeter-size crystals (10 × 10 × 3 mm) of were facilely obtained by the temperature cooling method, and its crystal-based detectors enable excellent self-powered detection of quite weak polarized light, showing a notable polarization-sensitive ratio (∼1.5), extremely low detection limit (∼100 nW/cm), and antifatigued stability. The alloyed aromatic cationic spacers facilitate the polarity and enhanced phase stability. This study paves a way for further exploration of new 2D perovskite candidates toward optoelectronic device applications.
具有结构和光学各向异性固有属性的二维（2D）杂化钙钛矿在偏振敏感光探测方面有着光明的前景。然而，在这个二维材料家族中，关于对相当微弱偏振光的自供电探测的研究仍然很少。通过将一个芳香族间隔基引入三维立方原型中，我们成功组装了一种具有极性结构单元的新型二维杂化钙钛矿，(FPEA)(MA)PbI （其中FPEA是4-氟苯乙铵，MA是甲铵）。其独特的二维量子阱结构允许具有约3.15的大比例的光吸收二向色性，并且自然极性导致显著的体光伏效应。此外，通过温度冷却法轻松获得了厘米尺寸的(FPEA)(MA)PbI晶体（10×10×3毫米），并且其基于晶体的探测器能够对相当微弱的偏振光进行出色的自供电探测，显示出显著的偏振敏感比率（约1.5）、极低的探测极限（约100 nW/cm）和抗疲劳稳定性。合金化的芳香族阳离子间隔基促进了极性并增强了相稳定性。这项研究为进一步探索用于光电器件应用的新型二维钙钛矿候选材料铺平了道路。
