Thin-Film Transformation of NH4 PbI3 to CH3 NH3 PbI3 Perovskite: A Methylamine-Induced Conversion-Healing Process

Yingxia Zong; Yuanyuan Zhou; Minggang Ju; Hector F Garces; Amanda R Krause; Fuxiang Ji; Guanglei Cui; Xiao Cheng Zeng; Nitin P Padture; Shuping Pang

doi:10.1002/anie.201609529

Thin-Film Transformation of NH₄ PbI₃ to CH₃ NH₃ PbI₃ Perovskite: A Methylamine-Induced Conversion-Healing Process

Angew Chem Int Ed Engl. 2016 Nov 14;55(47):14723-14727. doi: 10.1002/anie.201609529. Epub 2016 Oct 21.

Authors

Affiliations

¹ Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, P.R. China.
² School of Engineering, Brown University, Providence, RI, 02912, USA.
³ Department of Chemistry, University of Nebraska, Lincoln, NE, 68588, USA.

PMID: 27766739
DOI: 10.1002/anie.201609529

Abstract

Methylamine-induced thin-film transformation at room-temperature is discovered, where a porous, rough, polycrystalline NH₄ PbI₃ non-perovskite thin film converts stepwise into a dense, ultrasmooth, textured CH₃ NH₃ PbI₃ perovskite thin film. Owing to the beneficial phase/structural development of the thin film, its photovoltaic properties undergo dramatic enhancement during this NH₄ PbI₃ -to-CH₃ NH₃ PbI₃ transformation process. The chemical origins of this transformation are studied at various length scales.

Keywords: hybrid perovskites; solar cells; thin films.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't