期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-08980-x
关键词
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资金
- National Science Foundation [DMR-1728921, DGE-1633587, ACI-1532235, ACI-1532236, CHE-1763207]
- UNC Research Opportunities Initiative (ROI) through the Center of Hybrid Materials Enabled Electronic Technology
- UNC Research Opportunities Initiative (ROI)
- National Science Foundation as part of the National Nanotechnology Coordinated Infrastructure, NNCI [ECCS-1542015]
- U.S. Department of Energy [DE-AC0205CH11231]
- U.S. Department of Energy, Office of Science [DE-SC0016083]
- Research Corporation for Science Advancement through a Cottrell Scholar Award
- A.P. Sloan Foundation
- University of Colorado Boulder
- Colorado State University
- NVIDIA Corporation
- China Scholarship Council (CSC) [201706175063]
- National Science Foundation of China (NSFC) [51503075]
Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethyl-ammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of twodimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.
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