期刊
ADVANCED ENERGY MATERIALS
卷 5, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201501310
关键词
cesium; formamidinium; mixed cations; perovskite solar cells; stabilities
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) of Korea [NRF-2012M1A2A2671721, 2012M3A7B4049986, NRF-2012M3A6A7054861]
- NRF [2011-0008000]
Although power conversion efficiency (PCE) of state-of-the-art perovskite solar cells has already exceeded 20%, photo- and/or moisture instability of organolead halide perovskite have prevented further commercialization. In particular, the underlying weak interaction of organic cations with surrounding iodides due to eight equivalent orientations of the organic cation along the body diagonals in unit cell and chemically non-inertness of organic cation result in photo- and moisture instability of organometal halide perovskite. Here, a perovskite light absorber incorporating organic-inorganic hybrid cation in the A-site of 3D APbI(3) structure with enhanced photo- and moisture stability is reported. A partial substitution of Cs+ for HC(NH2)(2)(+) in HC(NH2)(2)PbI3 perovskite is found to substantially improve photo- and moisture stability along with photovoltaic performance. When 10% of HC(NH2)(2)(+) is replaced by Cs+, photo- and moisture stability of perovskite film are significantly improved, which is attributed to the enhanced interaction between HC(NH2)(2)(+) and iodide due to contraction of cubo-octahedral volume. Moreover, trap density is reduced by one order of magnitude upon incorporation of Cs+, which is responsible for the increased open-circuit voltage and fill factor, eventually leading to enhancement of average PCE from 14.9% to 16.5%.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据