The Diffusion of Low-Energy Methyl Group on ITO Film Surface and Its Impact on Optical-Electrical Properties

Chaoqian Liu,Dongying Ju,Bing Han,Zhixuan Lv,Wanyu Ding,Xuelin Guo,Hualin Wang,Nan Wang,Yunxian Cui,Shimin Liu,Shiping Zhao,Weiwei Jiang

doi:10.3390/ma11101991

Abstract

Indium tin oxide (ITO) film is one of the ideal candidates for transparent conductive cathode in methylammonium lead halide perovskite solar cells. Thus, the diffusion of methyl group in ITO film is inevitable, which could deteriorate the optical-electrical property of ITO film. In this study, ITO films with and without (100) preferred orientation were bombarded by the low-energy methyl group beam. After the bombardment, the optical-electrical property of ITO film without (100) preferred orientation deteriorated. The bombardment of methyl group had little influence on the optical-electrical property of ITO film with (100) preferred orientation. Finally, combining the crystallographic texture and chemical bond structure analysis, the diffusion mechanism of low-energy methyl group on ITO lattice and grain boundary, as well as the relation between the optical-electrical property and the diffusion of the methyl group, were discussed systematically. With the above results, ITO film with (100) preferred orientation could be an ideal candidate for transparent conductive cathode in methylammonium lead halide perovskite solar cells.

Highlights

As one of the most spectacular solar cells, the methylammonium lead halide (MAPbH3 ) perovskite solar cell has attracted the attention of researchers from all over the world [1,2,3,4,5]
Traditional indium tin oxide (ITO) film was bombarded by a low-energy methyl cation
Special attention was paid to the relation between the optical-electrical properties of the Indium tin oxide (ITO) film and the (100) preferred orientation of the ITO film, which was bombarded by a CH+

Summary

Introduction

As one of the most spectacular solar cells, the methylammonium lead halide (MAPbH3 ) perovskite solar cell has attracted the attention of researchers from all over the world [1,2,3,4,5]. The typical MAPbH3 perovskite solar cell consists of the transparent conductive cathode, electron transfer layer, MAPbH3 perovskite layer, hole transport layer, and metal anode [6]. The electron transfer layer, MAPbH3 perovskite layer, and hole transport layer are focused on by most researchers [6,7,8,9,10,11,12]. As the electrode in the MAPbH3 perovskite solar cell, ITO film suffers a serious attack from many kinds of groups/ions during the spin coating and annealing process of the MAPbH3 layer, such as methyl, amino, methylammonium, halide ion, and so on. The electron transfer layer could not completely prevent the attack on ITO film by the above

Methods

Results

Conclusion