Structural and photophysical investigation of single-source evaporation of CsFAPbI3 and FAPbI3 perovskite thin films?

Journal of Materials Chemistry C Pub Date: 2022-06-14 DOI: 10.1039/D2TC01164F

Abstract

Thermal vacuum deposition is a stimulating technique for upscaling perovskite solar cells. However, the operational complexity of multisource vapor deposition (MSVD) and achieving stoichiometric perovskite layers may impede its implementation. The single-source vapor deposition (SSVD) method has recently emerged as an alternative for MSVD due to its inherent functionality and ease of operation. Here, for the first time, we demonstrate a successful SSVD approach for fabricating pure CsFAPbI3 and FAPbI3 thin films from pre-synthesized perovskite powders. We carried out structural and photophysical investigations to optimize the phase purity and shelf-life of the deposited thin films. Furthermore, we probed the perovskite layer compatibility with various underlayers; we noted that MeO–2PACz, an organic underlayer, displayed superiority over other organic underlayers such as Spiro-OMeTAD and TaTm, and the SnO2 metal oxide layer, which might indicate that this method is more suitable for p–i–n solar cell fabrication. Our approach presents a straightforward methodology and avoids the use of multiple thermal sources to deposit CsFAPbI3 and can further ease the vacuum deposition methodology.

Graphical abstract: Structural and photophysical investigation of single-source evaporation of CsFAPbI3 and FAPbI3 perovskite thin films
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