Reduction of intrinsic defects in hybrid perovskite films via precursor purification

Deliang Zhang; Bin-Bin Cui; Chenxiao Zhou; Liang Li; Yihua Chen; Ning Zhou; Ziqi Xu; Yujing Li; Huanping Zhou; Qi Chen

doi:10.1039/C7CC05590K

Reduction of intrinsic defects in hybrid perovskite films via precursor purification†

Deliang Zhang,^a Bin-Bin Cui,

*^b Chenxiao Zhou,^a Liang Li,^c Yihua Chen,^c Ning Zhou,^c Ziqi Xu,^c Yujing Li,^a Huanping Zhou

^c and Qi Chen

*^a

Author affiliations

* Corresponding authors

^a Department of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
E-mail: qic@bit.edu.cn

^b Advanced Research Institute for Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, P. R. China
E-mail: cui-chem@bit.edu.cn

^c Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, P. R. China

Abstract

A simple chemical process was developed in a scalable manner, to reduce trap states in perovskite absorbers from the very beginning. The obvious decrease of I₂ in methylammonium iodide and the decrease of trap density in the resultant films were identified, which led to the power conversion efficiency (PCE) of perovskite solar cells (PSCs) increase from 16.5% to 18.5%.

Chemical Communications

Reduction of intrinsic defects in hybrid perovskite films via precursor purification†

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