Journal
ACS ENERGY LETTERS
Volume 6, Issue 8, Pages 2944-2951Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01018
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Funding
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2018-CPF-3669.02, KAUST OSR-CARF URF/1/3079-33-01, KAUST OSR-CRG RF/1/3383, KAUST OSR-CRG2018-3737, IED OSR-2019-4208]
- US Department of the Navy, Office of Naval Research [N00014-20-1-2572]
- Swiss Federal Office of Energy [SI/501804-01 INTENT]
- Swiss National Science Foundation [176552, CRSII5_171000]
- Swiss National Science Foundation (SNF) [CRSII5_171000] Funding Source: Swiss National Science Foundation (SNF)
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Perovskite/silicon tandem solar cells have shown promising outdoor performance in field-testing in Saudi Arabia. While the open circuit voltage remains stable, the fill factor degrades due to reversible ion migration in perovskite and irreversible corrosion of the silver top contact, which forms silver iodide. These findings provide guidance for the development of more stable perovskite/silicon tandems.
Perovskite/silicon tandem solar cells are emerging as a high-efficiency and prospectively cost-effective solar technology with great promise for deployment at the utility scale. However, despite the remarkable performance progress reported lately, assuring sufficient device stability-particularly of the perovskite top cell-remains a challenge on the path to practical impact. In this work, we analyze the outdoor performance of encapsulated bifacial perovskite/silicon tandems, by carrying out field-testing in Saudi Arabia. Over a six month experiment, we find that the open circuit voltage retains its initial value, whereas the fill factor degrades, which is found to have two causes. A first degradation mechanism is linked with ion migration in the perovskite and is largely reversible overnight, though it does induce hysteretic behavior over time. A second, irreversible, mechanism is caused by corrosion of the silver metal top contact with the formation of silver iodide. These findings provide directions for the design of new and more stable perovskite/silicon tandems
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