Bottom‐Up Quasi‐Epitaxial Growth of Hybrid Perovskite from Solution Process—Achieving High‐Efficiency Solar Cells via Template​‐Guided Crystallization

Epitaxial growth gives the highest‐quality crystalline semiconductor thin films for optoelectronic devices. Here, a universal solution‐processed bottom‐up quasi‐epitaxial growth of highly oriented α‐formamidinium lead triiodide (α‐FAPbI3) perovskite film via a two‐step method is reported, in which t...

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Published in:Advanced materials (Weinheim) Vol. 33; no. 22; pp. e2100009 - n/a
Main Authors: Zhang, Hengkai, Qin, Minchao, Chen, Zhiliang, Yu, Wei, Ren, Zhiwei, Liu, Kuan, Huang, Jiaming, Zhang, Yaokang, Liang, Qiong, Chandran, Hrisheekesh Thachoth, Fong, Patrick W. K., Zheng, Zijian, Lu, Xinhui, Li, Gang
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 01.06.2021
Subjects:
bottom‐up growth
Crystal defects
Crystal structure
Crystallinity
Crystallization
Crystallography
Energy conversion efficiency
Epitaxial growth
Materials science
Optoelectronic devices
perovskite solar cells
Perovskites
Photovoltaic cells
quasi‐epitaxial growth
self‐assembly
Solar cells
Thin films
self-assembly
bottom-up growth
perovskite solar cells
quasi-epitaxial growth
ISSN:0935-9648, 1521-4095, 1521-4095
Online Access:Get full text
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Summary:Epitaxial growth gives the highest‐quality crystalline semiconductor thin films for optoelectronic devices. Here, a universal solution‐processed bottom‐up quasi‐epitaxial growth of highly oriented α‐formamidinium lead triiodide (α‐FAPbI3) perovskite film via a two‐step method is reported, in which the crystal orientation of α‐FAPbI3 film is precisely controlled through the synergetic effect of methylammonium chloride and the large‐organic cation butylammonium bromide. In situ GIWAXS visualizes the BA‐related intermediate phase formation at the bottom of film, which serves as a guiding template for the bottom‐up quasi‐epitaxial growth in the subsequent annealing process. The template‐guided epitaxially grown BAFAMA perovskite film exhibits increased crystallinity, preferred crystallographic orientation, and reduced defects. Moreover, the BAFAMA perovskite solar cells demonstrate decent stability, maintaining 95% of their initial power conversion efficiency after 2600 h ambient storage, and 4‐time operation condition lifetime enhancement. A universal solution‐processed bottom‐up quasi‐epitaxial growth of highly oriented α‐FAPbI3 perovskite film is achieved through the synergetic effect of methylammonium chloride and a large‐organic cation. In situ GIWAXS visualizes the BA‐related intermediate phase formation at the bottom, which serves as a guiding template for the bottom‐up quasi‐epitaxial growth in the subsequent annealing process.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.202100009