期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 45, 页码 25113-25120出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06268
关键词
perovskite films; moisture; hydration; degradation; electrical resistance
资金
- Director Fund of Wuhan National Laboratory for Optoelectronics
- 973 Program of China [2011CBA00703]
- Program for New Century Excellent Talents in University [NCET-12-0216]
- National 1000 Young Talents project
- National Natural Science Foundation of China [61322401]
Organometal halide perovskites have recently emerged as outstanding semiconductors for solid-state optoelectronic devices. Their sensitivity to moisture is one of the biggest barriers to commercialization. In order to identify the effect of moisture in the degradation process, here we combined the in situ electrical resistance measurement with time-resolved X-ray diffraction analysis to investigate the interaction of CH3NH3PbI3-xClx perovskite films with moisture. Upon short-time exposure, the resistance of the perovskite films decreased and it could be fully recovered, which were ascribed to a mere chemisorption of water molecules, followed by the reversible hydration into CH(3)NH(3)PbI(3-x)Clx center dot H2O. Upon long-time exposure, however, the resistance became irreversible due to the decomposition into PbI2. The results demonstrated the formation of monohydrated intermediate phase when the perovskites interacted with moisture. The role of moisture in accelerating the thermal degradation at 85 degrees C was also demonstrated. Furthermore, our study suggested that the perovskite films with fewer defects may be more inherently resistant to moisture.
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