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Thermally evaporated methylammonium-free perovskite solar cells

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Abstract

Thermal evaporation is a well-established and versatile method for the deposition of large-area, uniform, high-quality semiconducting layers in a broad range of optoelectronic applications. Despite extensive investigation of deposition by thermal evaporation in the field of perovskite solar cells, solution-processed perovskite devices still significantly outperform those fabricated by thermal evaporation, particularly in the case of methylammonium-free perovskite compositions. Herein, we fabricate and investigate thermally evaporated Cs0.1FAxPbI2+xBr0.1 perovskite solar cells and explore the effects of FAI deficiency or excess and that of post-annealing on the perovskite layer properties and device performance. We find that annealing can significantly improve the optical and structural properties of FAI-poor perovskite layers, resulting in a stark enhancement of their photovoltaic performance. While stoichiometric devices are also improved, albeit to a lesser degree, by post-annealing, this process is found to be detrimental for the FAI-rich devices, resulting in a drastic loss of performance. We show that annealed stoichiometric devices with an optimised active layer thickness result in power conversion efficiencies of up to 16.6%, approaching the performance of solution-processed devices of similar composition.

Graphical abstract: Thermally evaporated methylammonium-free perovskite solar cells

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Supplementary files

Article information


Submitted
26 Mar 2020
Accepted
28 Apr 2020
First published
29 Apr 2020

This article is Open Access

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Thermally evaporated methylammonium-free perovskite solar cells

R. Ji, Z. Zhang, C. Cho, Q. An, F. Paulus, M. Kroll, M. Löffler, F. Nehm, B. Rellinghaus, K. Leo and Y. Vaynzof, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01550D

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