Guo Linjuan, Song Yi, Wang Baorong, Cong Ridong, Zhao Lei, Zhang Suheng, Li Leipeng, Wu Wenqiang, Wang Shufang, San Xingyuan, Pan Caofeng, Yang Zheng
Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China.
Institute of Life Science and Green Development, Hebei University, Baoding 071002, P. R. China.
ACS Appl Mater Interfaces. 2024 Apr 3;16(13):16482-16493. doi: 10.1021/acsami.4c00302. Epub 2024 Mar 20.
The interfacial pyro-phototronic effect (IPPE) presents a novel approach for improving the performance of self-powered photodetectors (PDs) based on metal halide perovskites (MHPs). The interfacial contact conditions within the Schottky junctions are crucial in facilitating the IPPE phenomenon. However, the fabrication of an ideal Schottky junction utilizing MHPs is a challenging endeavor. In this study, we present a surface passivation method aimed at enhancing the performance of self-powered photodetectors based on inverted planar perovskite structures in micro- and nanoscale metal-halide perovskite SCs. Our findings demonstrate that the incorporation of a lead halide salt with a benzene ring moiety for surface passivation leads to a substantial improvement in photoresponses by means of the IPPE. Conversely, the inclusion of an alkane chain in the salt impedes the IPPE. The underlying mechanism can be elucidated through an examination of the band structure, particularly the work function (WF) modulated by surface passivation. Consequently, this alteration affects the band bending and the built-in field () at the interface. This strategy presents a feasible and effective method for producing interfacial pyroelectricity in MHPs, thus facilitating its potential application in practical contexts such as energy conversion and infrared sensors.
界面热光电效应（IPPE）为提高基于金属卤化物钙钛矿（MHP）的自供电光电探测器（PD）的性能提供了一种新方法。肖特基结内的界面接触条件对于促进IPPE现象至关重要。然而，利用MHP制造理想的肖特基结是一项具有挑战性的工作。在本研究中，我们提出了一种表面钝化方法，旨在提高基于微纳尺度金属卤化物钙钛矿SCs中倒置平面钙钛矿结构的自供电光电探测器的性能。我们的研究结果表明，引入带有苯环部分的卤化铅盐进行表面钝化，通过IPPE可使光响应显著改善。相反，盐中包含烷烃链会阻碍IPPE。通过研究能带结构，特别是表面钝化调制的功函数（WF），可以阐明其潜在机制。因此，这种改变会影响界面处的能带弯曲和内建电场（）。该策略为在MHP中产生界面热电性提供了一种可行且有效的方法，从而促进其在能量转换和红外传感器等实际应用中的潜在应用。
