Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202002614
Keywords
degradation; photovoltaic operational stability; recombination; reverse bias; solid-state electrochemical reactions
Categories
Funding
- Swiss National Science Foundation Postdoc Mobility Fellowship [P400P2_180780]
- National Science Foundation [ECCS-1542152]
- Office of Naval Research [N00014-17-1-2212]
- Swiss National Science Foundation (SNF) [P400P2_180780] Funding Source: Swiss National Science Foundation (SNF)
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Studies have shown that metal halide perovskite solar cells exhibit interesting behavior in reverse bias, including reversible performance loss and non-reversible degradation. An advanced drift-diffusion approach incorporating an electrochemical term is used to explain the losses in short-circuit, open circuit, and fill factor measured experimentally after prolonged reverse bias.
Partial shading of a solar module can induce a set of cells within the module to operate under reverse bias. Studies have shown that metal halide perovskite solar cells with a wide variety of compositions and contacts exhibit interesting behavior in reverse bias that includes both reversible performance loss and non-reversible degradation. In this paper, an advanced drift-diffusion approach incorporating an electrochemical term to explain the short-circuit, open circuit and fill factor losses that are experimentally measured after prolonged reverse bias is used. It is shown that holes can tunnel into the perovskite due to sharp band bending near the contact, accumulate within the bulk of the perovskite absorber, and trigger the oxidation of halides to form neutral halogens. The density of neutral halogens is much higher in reverse bias because there are hardly any electrons available to reduce the iodine. The resulting halogens act as bulk recombination centers. While the interstitial halogen density does decay when the cell is operated in forward bias, permanent degradation can occur if the iodine diffuses out of the perovskite layer. Finally, the ways in which changing parameters such as the mobile ion density or the series resistance at the contact can influence device performance and stability are discussed.
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