期刊
ADVANCED MATERIALS
卷 31, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804835
关键词
additives; guanidinium; hybrid cations; lead-free perovskites; solar cells
类别
资金
- Ministry of Science and Technology (MOST), Taiwan [MOST 107-3017-F009-003, MOST 106-2119-M-009-001, MOST 105-2119-M-009-MY3]
- Center for Emergent Functional Matter Science of National Chiao Tung University (NCTU) from The Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan
The stability of a tin-based perovskite solar cell is a major challenge. Here, hybrid tin-based perovskite solar cells in a new series that incorporate a nonpolar organic cation, guanidinium (GA(+)), in varied proportions into the formamidinium (FA(+)) tin triiodide perovskite (FASnI(3)) crystal structure in the presence of 1% ethylenediammonium diiodide (EDAI(2)) as an additive, are reported. The device performance is optimized at a precursor ratio (GAI:FAI) of 20:80 to attain a power conversion efficiency (PCE) of 8.5% when prepared freshly; the efficiencies continuously increase to attain a record PCE of 9.6% after storage in a glove-box environment for 2000 h. The hybrid perovskite works stably under continuous 1 sun illumination for 1 h and storage in air for 6 days without encapsulation. Such a tin-based perovskite passes all harsh standard tests, and the efficiency of a fresh device, 8.3%, is certified. The great performance and stability of the device reported herein attains a new milestone for lead-free perovskite solar cells on a path toward commercial development.
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