Journal
ADVANCED MATERIALS
Volume 30, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705393
Keywords
defect states; energy disorder; energy loss; inorganic perovskites; nanocrystals; polymers; solar cells; surface passivation
Categories
Funding
- National Science Foundation of China (NSFC) [51433003]
- National Basic Research Program of China (973 Program) [2014CB643503]
- National Postdoctoral Program for Innovative Talents [BX201600060]
- JLU Science and Technology Innovative Research Team [2017TD-06]
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Cesium-based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (E-loss) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI2Br absorber and polythiophene hole-acceptor to minimize the E-loss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2Br, can significantly reduce electron-hole recombination within the perovskite, which is due to the electronic passivation of surface defect states. In addition, the interfacial properties are improved by a simple annealing process, leading to significantly reduced energy disorder in polythiophene and enhanced hole-injection into the hole-acceptor. Consequently, one of the highest power conversion efficiency (PCE) of 12.02% from a reverse scan in inorganic mixed-halide perovskite solar cells is obtained. Modifying the perovskite films with annealing polythiophene enables an open-circuit voltage (V-OC) of up to 1.32 V and E-loss of down to 0.5 eV, which both are the optimal values reported among cesium-lead mixed-halide perovskite solar cells to date. This method provides a new route to further improve the efficiency of perovskite solar cells by minimizing the E-loss.
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