Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 44, Pages 30107-30115Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09532
Keywords
perovskite solar cells; thin films; thermal stability; solvent engineering; two-step process
Funding
- National Natural Science Foundation of China [51273104, 91433205, 51672111]
- National Key Basic Research Program of China 973 program early projects [2014CB260405]
- Natural Science Foundation of Hebei Province [F2015201189]
- 100 Talents Program of Hebei Province [E2014100008]
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Currently, the potential mechanism of the solvent-assisted crystallization for mixed cations perovskite thin film (FA(x)MA(1-x)PbI(3)) prepared via two-step solution-process still remains obscure. Here, we clarified the molecular-competing-reacted process of NH2CH=NH2I (FAI) and CH3NH3I (MAI) with PbI2(DMSO)(x) complex in dimethyl sulfoxide (DMSO) and diethyl ether (DE) catalytic solvent system in the sequential two-step solution-process. The microscopic dynamics was characterized via the characterizations of in situ photoluminescence spectra, In addition, we found that the thermal stability of the perovskite films suffered from the residual solvent with high boiling point, for example, DMSO. The further DE treatment could promote the volatility process of DMSO and accelerate the crystallization process of perovskite films. The highest PCE over 19% with slight hysteresis effect was eventually obtained with a reproducible FA(0.88)MA(0.12)PbI(3) solar cell, which displayed a constant power output within 1-00 s upon light soaking and stable PCE output within 30 d in the thermal stability test.
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