Isothermally crystallized perovskites at room-temperature

Kai Wang, Congcong Wu, Yuchen Hou, Dong Yang, Tao Ye, Jungjin Yoon, Mohan Sanghadasa, Shashank Priya

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149 Scopus citations


The solution processability of photoactive halide perovskites differentiates them from traditional inorganic semiconducting materials that require multiple post-processing steps such as thermal/vacuum/blowing- and solvent-assisted treatment. Here we report a technical breakthrough of isothermally crystallizing high-quality perovskite films at room-temperature (RT) without the necessity of any post-processing. This process takes advantage of our discovery of a metastable intermediate of lower-dimensionality formed by amine-assisted crystallographic lattice expansion from an initial three-dimensional perovskite. Using in situ optoelectrical/chemical and ex situ structural characterizations, a detailed understanding of the low-dimensional metastable intermediate is developed. In conjunction with the metastable intermediate, the rapid evaporation of the solvent and amine facilitates ultra-fast crystallization at RT within seconds. This RT rapidly synthesized perovskite film exhibits a carrier diffusion length of 2.9 µm and {00l} preferred orientation with an ultrahigh Lotgering factor of 97%. These films are highly compatible to conventional or inverted devices, demonstrating 22.3% and 23.1% power conversion efficiencies, respectively.

Original languageEnglish (US)
Pages (from-to)3412-3422
Number of pages11
JournalEnergy and Environmental Science
Issue number10
StatePublished - Oct 2020
Externally publishedYes

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