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Issue 16, 2021
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A sandwich-like structural model revealed for quasi-2D perovskite films

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The excellent performance and stability of perovskite solar cells (PSCs) based on quasi-2D Ruddlesden–Popper perovskites (RPPs) holds promise for their commercialization. Further improvement in the performance of 2D PSCs requires a detailed understanding of the microstructure of the quasi-2D perovskite films. Based on scanning transmission electron microscopy (STEM), time-resolved photoluminescence, and transient absorption measurements, a new sandwich-like structural model is proposed to describe the phase distribution of RPPs. In contrast to the conventional gradient distribution, it is found that small-n RPPs are sandwiched between large-n RPP phase layers at the front and back sides owing to crystallization initiated from both interfaces during film formation. This sandwich-like distribution profile facilitates excitons funneling from the film interior to both surfaces for dissociation while free carriers transport via large-n channels that permeate the film to ensure efficient charge collection by the corresponding electrodes, which is favorable for high-performance photovoltaics. This discovery provides a new fundamental understanding of the operating principles of 2D PSCs and has valuable implications for the design and optimization strategies of optoelectronic devices based on quasi-2D RPPs films.

Graphical abstract: A sandwich-like structural model revealed for quasi-2D perovskite films

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Supplementary files

Article information

07 Feb 2021
21 Mar 2021
First published
25 Mar 2021

J. Mater. Chem. C, 2021,9, 5362-5372
Article type

A sandwich-like structural model revealed for quasi-2D perovskite films

F. Zheng, C. R. Hall, D. Angmo, C. Zuo, S. Rubanov, Z. Wen, S. J. Bradley, X. Hao, M. Gao, T. A. Smith and K. P. Ghiggino, J. Mater. Chem. C, 2021, 9, 5362
DOI: 10.1039/D1TC00606A

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