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Beneficial effects of cesium acetate in the sequential deposition method for perovskite solar cells

Abstract

The cesium cation (Cs+) widely used as dopant for highly efficient and stable formamidinium lead tri-halide perovskite (FAPbX3, X=I, Br, Cl) solar cells. Herein, we introduce a small amount of cesium acetate (CsAc) that can effectively stabilize FAMAPbI3 under thermal- and light illumination-stress. We show that incorporated Cs+ leads to relaxation of strain in the perovskite layer, and that Ac- forms a strong intermediate phase with PbI2, which can help the intercalation of the PbI2 film with Cs+ and cation halide (FAI, MAI, MACl) in the sequential deposition process. The addition of CsAc reduces the trap density in the resulting perovskite layers and extends their carrier lifetime. The CsAc-modified perovskite solar cells show less hysteresis phenomena and enhanced operational-, and thermal stability in ambient conditions. Our findings provide insight on how dopants and synthesis precursors play an important role for efficient and stable perovskite solar cells.

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Supplementary files

Article information


Submitted
26 Feb 2021
Accepted
01 May 2021
First published
04 May 2021

This article is Open Access

Nanoscale, 2021, Accepted Manuscript
Article type
Paper

Beneficial effects of cesium acetate in the sequential deposition method for perovskite solar cells

B. J. Kim and G. Boschloo, Nanoscale, 2021, Accepted Manuscript , DOI: 10.1039/D1NR01281A

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