揭示常规型 C-CHNHPbI 杂化钙钛矿太阳能电池中的滞后现象。

Unraveling current hysteresis effects in regular-type C-CHNHPbI heterojunction solar cells.

机构信息

Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, Republic of China.

出版信息

Nanoscale. 2017 Nov 23;9(45):17802-17806. doi: 10.1039/c7nr07001b.

DOI:10.1039/c7nr07001b

PMID:29115332

Abstract

Comprehensive studies were carried out to understand the origin of the current hysteresis effects in highly efficient C-CHNHPbI(MAPbI) heterojunction solar cells, using atomic-force microscopy, transmittance spectra, photoluminescence spectra, X-ray diffraction patterns and a femtosecond time-resolved pump-probe technique. The power conversion efficiency (PCE) of C-MAPbI solar cells can be increased to 18.23% by eliminating the point (lattice) defects in the MAPbI thin film which is fabricated by using the one-step spin-coating method with toluene washing treatment. The experimental results show that the point defects and surface defects of the MAPbI thin films can be minimized by varying the dropping time of the washing solvent. The point defects (surface defects) can be reduced with an (a) increase (decrease) in the dropping time, resulting in an optimized dropping time for obtaining the defect-minimized MAPbI thin film deposited on top of the C thin film. Consequently, the formation of the defect-minimized MAPbI thin film allows for high-efficiency MAPbI solar cells.

摘要

采用原子力显微镜、透射光谱、光致发光光谱、X 射线衍射图谱和飞秒时间分辨泵浦探测技术，对高效 C-CHNHPbI（MAPbI）异质结太阳能电池中当前滞后效应的起源进行了综合研究。通过采用甲苯洗涤处理的一步旋涂法，消除 MAPbI 薄膜中的点（晶格）缺陷，可以将 C-MAPbI 太阳能电池的功率转换效率（PCE）提高到 18.23%。实验结果表明，通过改变洗涤溶剂的滴落时间，可以最小化 MAPbI 薄膜的点缺陷和表面缺陷。随着（a）滴落时间的增加（减少），点缺陷（表面缺陷）会减少，从而获得在 C 薄膜上沉积的缺陷最小化的 MAPbI 薄膜的最佳滴落时间。因此，缺陷最小化的 MAPbI 薄膜的形成使得高效的 MAPbI 太阳能电池成为可能。