期刊
ACS ENERGY LETTERS
卷 4, 期 7, 页码 1521-1527出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00892
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资金
- U.S. Department of the Navy, Office of Naval Research [N00014-17-1-2524]
- Banting Postdoctoral Fellowship Program
- NSERC Alexander Graham Bell Scholarship program
Impressive progress in halide perovskite solar cells motivates further work to improve operating stability. It is known that ion-migration-driven decomposition represents a degradation pathway in perovskite solar cells and that it can occur within the perovskite material even in well-encapsulated devices. Here we find that quasi-two-dimensional (2.5D) perovskites suppress this ion migration-induced degradation. Using TOF-SIMS, we confirm that iodide migration occurs in bulk perovskite photovoltaic devices operating at their maximum power point (MPP). We observe that iodine ions migrate across the spiro-OMeTAD layer to the Spiro/gold contact interface, oxidizing and deteriorating the gold at the interface. In contrast, we find that large < n > 2.5D perovskites exhibit a significantly reduced rate of ion migration compared to 3D devices and exhibit less than 1% relative PCE loss in over 80 h of continuous operation at MPP, whereas the PCE of 3D devices diminishes by more than 50% within the first 24 h.
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