Molecular engineering enables high-performance hybrid perovskite photodetector

Chip Pub Date : 2024-12-30 DOI:10.1016/j.chip.2024.100125
Peiding Liu , Xing Zhang , Bolei Zhang , Yong Wang , Wanbiao Hu , Feng Qiu
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引用次数: 0

Abstract

Highly optical-absorption hybrid perovskites with upgraded stability and superior photoelectronic properties are essential for optoelectronics. However, various defects are generated by the solution-based film quality inevitably produces during the crystallization process, which leads to non-radiative recombination and interface mismatch. In this work, polyvinylpyrrolidone (PVP) molecule layer was implemented as the interfacially multifunctional layer and selective transport layer to fabricate an effective photodetector. Interfacial PVP is conductive to the bond coordination between the PVP molecule and the MAPbI3 surface, which could lower the work function of the perovskite film and effectively improve its surface morphology so as to isolate it from water and oxygen molecules. The interfacial passivation for the undercoordinated Pb2+ defects was also verified via first-principles calculations. The electron injection barrier can be regulated via interfacial molecule engineering, leading to the result that the dark current is suppressed by five orders of magnitude to 1.57 × 10−11 A, and the specific detectivity improved by about three orders of magnitude reaching 2.9 × 1012 Jones. These results provide a feasible route to fabricate highly sensitive and stable hybrid perovskite photodetectors.

Abstract Image

分子工程使高性能混合钙钛矿光电探测器成为可能
具有高稳定性和优异光电性能的高光吸收杂化钙钛矿在光电子学中是必不可少的。然而,结晶过程中不可避免地会产生以溶液为基础的膜质量所产生的各种缺陷,导致非辐射复合和界面失配。本研究利用聚乙烯吡咯烷酮(PVP)分子层作为界面多功能层和选择性传输层,制备了一种有效的光电探测器。界面PVP有利于PVP分子与MAPbI3表面的键配合,可以降低钙钛矿膜的功函数,有效改善其表面形貌,使其与水、氧分子隔离。通过第一性原理计算验证了欠配位Pb2+缺陷的界面钝化。通过界面分子工程可以调节电子注入势垒,使暗电流被抑制5个数量级,达到1.57 × 10−11 A,比探测率提高约3个数量级,达到2.9 × 1012 Jones。这些结果为制备高灵敏度、高稳定性的杂化钙钛矿光电探测器提供了一条可行的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
2.80
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