Journal
ADVANCED MATERIALS
Volume 29, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201604758
Keywords
dual-source precursor approaches; inverted planar heterojunctions; perovskite solar cells; stable mixed-cation perovskites
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Funding
- 973 Program of China [2015CB932203]
- National Natural Science Foundation of China [61377025, 91433203]
- Young 1000 Talents Global Recruitment Program of China
- Advanced Light Source Doctoral Fellowship in Residence at the Lawrence Berkeley National Laboratory
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The highest efficiencies reported for perovskite solar cells so far have been obtained mainly with methylammonium and formamidinium mixed cations. Currently, high-quality mixed-cation perovskite thin films are normally made by use of antisolvent protocols. However, the widely used antisolvent-assisted fabrication route suffers from challenges such as poor device reproducibility, toxic and hazardous organic solvent, and incompatibility with scalable fabrication process. Here, a simple dual-source precursor approach is developed to fabricate high-quality and mirror-like mixed-cation perovskite thin films without involving additional antisolvent process. By integrating the perovskite films into the planar heterojunction solar cells, a power conversion efficiency of 20.15% is achieved with negligible current density-voltage hysteresis. A stabilized power output approaching 20% is obtained at the maximum power point. These results shed light on fabricating highly efficient perovskite solar cells via a simple process, and pave the way for solar cell fabrication via scalable methods in the near future.
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