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Solution‐Phase Epitaxial Growth of Perovskite Films on 2D Material Flakes for High‐Performance Solar Cells
Author(s) -
Tang Guanqi,
You Peng,
Tai Qidong,
Yang Anneng,
Cao Jiupeng,
Zheng Fangyuan,
Zhou Zhiwen,
Zhao Jiong,
Chan Paddy Kwok Leung,
Yan Feng
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201807689
Subject(s) - materials science , perovskite (structure) , crystallinity , epitaxy , energy conversion efficiency , layer (electronics) , transmission electron microscopy , phase (matter) , optoelectronics , van der waals force , chemical engineering , nanotechnology , composite material , chemistry , organic chemistry , molecule , engineering
The quality of perovskite films is critical to the performance of perovskite solar cells. However, it is challenging to control the crystallinity and orientation of solution‐processed perovskite films. Here, solution‐phase van der Waals epitaxy growth of MAPbI 3 perovskite films on MoS 2 flakes is reported. Under transmission electron microscopy, in‐plane coupling between the perovskite and the MoS 2 crystal lattices is observed, leading to perovskite films with larger grain size, lower trap density, and preferential growth orientation along (110) normal to the MoS 2 surface. In perovskite solar cells, when perovskite active layers are grown on MoS 2 flakes coated on hole‐transport layers, the power conversion efficiency is substantially enhanced for 15%, relatively, due to the increased crystallinity of the perovskite layer and the improved hole extraction and transfer rate at the interface. This work paves a way for preparing high‐performance perovskite solar cells and other optoelectronic devices by introducing 2D materials as interfacial layers.