期刊
NANO RESEARCH
卷 7, 期 12, 页码 1749-1758出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0534-8
关键词
perovskite solar cells; planar heterojunction; charge carrier diffusion lengths; ZnO nanocrystal films; large area devices
类别
资金
- National Basic Research Program of China (973 Program) [2012CB932402]
- National High Technology Research and Development Program of China [2011AA050520]
- National Natural Science Foundation of China [51172203, 61176057, 91123005, 61205036]
- Natural Science Funds for Distinguished Young Scholars of Zhejiang Province [R4110189]
- Public Welfare Project of Zhejiang Province [2013C31057]
- Theme-based Research Scheme from Research Grants Council of Hong Kong [T23-407/13-N]
- Shun Hing Institute of Advanced Engineering Grant from the Chinese University of Hong Kong [8115041]
We demonstrate that charge carrier diffusion lengths of two classes of perovskites, CH3NH3PbI3-xClx and CH3NH3PbI3, are both highly sensitive to film processing conditions and optimal processing procedures are critical to preserving the long carrier diffusion lengths of the perovskite films. This understanding, together with the improved cathode interface using bilayer-structured electron transporting interlayers of [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM)/ZnO, leads to the successful fabrication of highly efficient, stable and reproducible planar heterojunction CH3NH3PbI3-xClx solar cells with impressive power-conversion efficiencies (PCEs) up to 15.9%. A 1-square-centimeter device yielding a PCE of 12.3% has been realized, demonstrating that this simple planar structure is promising for large-area devices.
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