Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 20, Pages 13147-13152Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp00563f
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [U1532155, U1532156, 11574316]
- National Key Research and Development Program of China [2016YFA0401803]
- Instrument Developing Project of the Chinese Academy of Sciences [YZ201423]
- Hefei Science Center CAS [2016HSC-IU006]
- One Thousand Young Talents Program of China
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The annealing temperature (T-a) effect on CH3NH3PbI3 perovskite solar cells (PSCs) was studied. By utilizing a two-step technique, the T-a dependences of the optical absorption, grain size, and crystallinity of a CH3NH3PbI3 thin film have been revealed. It is found that the grain size of the CH3NH3PbI3 film increases monotonically with T-a. Meanwhile, the decomposed PbI2 emerges when T-a exceeds 120 degrees C and its content increases rapidly as T-a increases further. Consequently, the optical absorption of the CH3NH3PbI3 film and the efficiency of PSCs reach their maximum at T-a = 120 degrees C simultaneously. The highest and average device performances of PSCs achieved via this method are 17.61% and 16.40%, respectively. These results confirm the key role played by temperature and provide a route to the performance-optimization of PSCs.
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