Issue 8, 2022

Oxygen-induced degradation in AgBiS2 nanocrystal solar cells

Abstract

AgBiS2 nanocrystal solar cells are among the most sustainable emerging photovoltaic technologies. Their environmentally-friendly composition and low energy consumption during fabrication make them particularly attractive for future applications. However, much remains unknown about the stability of these devices, in particular under operational conditions. In this study, we explore the effects of oxygen and light on the stability of AgBiS2 nanocrystal solar cells and identify its dependence on the charge extraction layers. Normally, the rate of oxygen-induced degradation of nanocrystals is related to their ligands, which determine the access sites by steric hindrance. We demonstrate that the ligands, commonly used in AgBiS2 solar cells, also play a crucial chemical role in the oxidation process. Specifically, we show that the tetramethylammonium iodide ligands enable their oxidation, leading to the formation of bismuth oxide and silver sulphide. Additionally, the rate of oxidation is impacted by the presence of water, often present at the surface of the ZnO electron extraction layer. Moreover, the degradation of the organic hole extraction layer also impacts the overall device stability and the materials’ photophysics. The understanding of these degradation processes is necessary for the development of mitigation strategies for future generations of more stable AgBiS2 nanocrystal solar cells.

Graphical abstract: Oxygen-induced degradation in AgBiS2 nanocrystal solar cells

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep. 2021
Accepted
14 Des. 2021
First published
14 Des. 2021

Nanoscale, 2022,14, 3020-3030

Oxygen-induced degradation in AgBiS2 nanocrystal solar cells

D. Becker-Koch, M. Albaladejo-Siguan, J. Kress, R. Kumar, Y. J. Hofstetter, Q. An, A. A. Bakulin, F. Paulus and Y. Vaynzof, Nanoscale, 2022, 14, 3020 DOI: 10.1039/D1NR06456H

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