材料科学
钙钛矿(结构)
结晶度
外延
能量转换效率
图层(电子)
透射电子显微镜
化学工程
相(物质)
范德瓦尔斯力
光电子学
纳米技术
复合材料
化学
工程类
分子
有机化学
作者
Gongguo Tang,Peng You,Qidong Tai,Anneng Yang,Jiangwei Cao,Fangyuan Zheng,Zhiwen Zhou,Jiong Zhao,Paddy K. L. Chan,Feng Yan
标识
DOI:10.1002/adma.201807689
摘要
Abstract 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.
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