| AVS 65th International Symposium & Exhibition | |
| Spectroscopic Ellipsometry Focus Topic | Monday Sessions |
| Session EL+AS+EM-MoM |
| Session: | Application of SE for the Characterization of Thin Films and Nanostructures |
| Presenter: | Rucheng Dai, University of Science and Technology of China |
| Authors: | X.Q. Wang, University of Science and Technology of China X.Y. Shan, University of Science and Technology of China H. Siddique, University of Science and Technology of China R.C. Dai, University of Science and Technology of China Z.P. Wang, University of Science and Technology of China Z.J. Ding, University of Science and Technology of China Z.M. Zhang, University of Science and Technology of China |
| Correspondent: | Click to Email |
Thermal Evolution Process of MaPbI3 Film Based on Spectroscopic Ellipsometry
Xiangqi Wang, Xueyan Shan, Hassan Siddique, Rucheng Dai, Zhongping Wang, Zejun Ding, and Zengming Zhang*
University of Science and Technology of China, Hefei 230026, China;
*Corresponding author: zzm@ustc.edu.cn
Abstract
During the last few years, the hybrid organic-inorganic methylammonium lead halide perovskite CH3NH3PbI3 (MaPbI3) has received great interest in the field of photovoltaics [1,2]. The relevant researches develop rapidly since the first realization of organic-inorganic hybrid solar cell, due to the excellent performance of MaPbI3, such as high charge mobilities, suitable band gap and long carrier diffusion length. However the stability of MaPbI has been a key issue hinder the practical application [3]. Here we present in-situ spectroscopic ellipsomety measurement to understand the nature of thermal degradation process of MaPbI . The dynamic evolution process of dielectric constants of the as-prepared MaPbI3 film through heating is obtained by an effective medium approximation model fitting. The proportion of MaPbI3 and PbI is also obtained from the analysis of the ellipsometry data. The thickness of the film decrease in two-step, which is explained as the collapse of the PbI2 frame. Our work provide the first in-situ detection of the optical properties through the degradation process of MaPbI3 film, which can be consulted for further improving the stability of MaPbI3.
References:
1. G.C. Xing et al, Long-Range Balanced Electron and Hole-Transport Lengths in Organic-Inorganic CH3NH3PbI3, Science 342, 344-347 (2013).
2. J.Y. Jeng et al, CH3NH3PbI3 Perovskite/Fullerene Planar-Heterojunction Hybrid Solar Cells, Advanced Materials 25, 3727-3732 (2013).
3. J.H. Noh et al, Chemical Management for Colorful, Efficient, and Stable Inorganic–Organic Hybrid Nanostructured Solar Cells, Nano Lett. 13, 1764-1769 (2013).