journal article·2019-07-12Open access

Suppressed Ion Migration in Reduced-Dimensional Perovskites Improves Operating Stability

Ziru Huang, Andrew H. Proppe, Hairen Tan, Makhsud I. Saidaminov, Furui Tan, Anyi Mei, Chih-Shan Tan, Mingyang Wei, Yi Hou, Hongwei Han, Shana O. Kelley, Edward H. Sargent

ACS Energy Letters· Volume 4· Issue 7

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada

Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3G4, Canada

National Laboratory of Solid State Microstructures, Collaborative Innovation Centre of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu 210093, China

Key Lab of Photovoltaic Materials, Department of Physics and Electronics, Henan University, Kaifeng 475004, China

Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China

Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 3M2, Canada

Funding

Government of Canada · Office of Naval Research · Natural Sciences and Engineering Research Council of Canada

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