期刊
ADVANCED ENERGY MATERIALS
卷 7, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700162
关键词
2D; air-stable; hot-casting; organic-inorganic halide perovskites; planar solar cells
类别
资金
- National Natural Science Foundation of China (NSFC) [51473036]
- NPRP from the Qatar National Research Fund (Qatar Foundation) [NPRP7-227-1-034]
2D perovskites have recently been shown to exhibit significantly improved environmental stability. Derived from their 3D analogues, 2D perovskites are formed by inserting bulky alkylammonium cations in-between the anionic layers. However, these insulating organic spacer cations also hinder charge transport. Herein, such a 2D perovskite, (iso-BA)(2)(MA)(3)Pb4I13, that contains short branched-chain spacer cations (iso-BA+) and shows a remarkable increase of optical absorption and crystallinity in comparison to the conventional linear one, n-BA+, is designed. After applying the hot-casting (HC) technique, all these properties are further improved. The HC (iso-BA)(2)(MA)(3)Pb4I13 sample exhibits the best ambient stability by maintaining its initial optical absorption after storage of 840 h in an environmental chamber at 20 degrees C with a relative humidity of 60% without encapsulation. More importantly, the out-of-plane crystal orientation of (iso-BA)(2)(MA)(3)Pb4I13 film is notably enhanced, which increases cross-plane charge mobility. As a result, the highest power conversion efficiencies (PCEs) measured from for current density versus voltage curves afford 8.82% and 10.63% for room-temperature and HC-processed 2D perovskites based planar solar cells, respectively. However, the corresponding steady-state PCEs are remarkably lower, which is presumably due to the significant hysteresis phenomena caused by low charge extraction efficiency at interfaces of C-60/2D perovskites.
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