Perspective pubs.acs.org/JPCL
Cite This: J. Phys. Chem. Lett. 2018, 9, 4657−4666
Stability of Perovskites at the Surface Analytic Level Congcong Wang and Yongli Gao*
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Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, United States ABSTRACT: Organic−inorganic halide perovskites have attracted considerable attention in the past few years because of their remarkable performance in optoelectronic devices. However, long-term stability of the materials and devices remains the biggest challenge for realistic implementation of perovskite solar cells. Although significant efforts have been carried out on the causes of degradation at the device level, few measurements have been made at the surface analytic level to reveal the degradation mechanisms. In this Perspective, we review the effects of environmental factors, such as O2, water, and light, on the perovskite layer by monitoring the intrinsic electronic structure and compositional changes in different exposure tests. This work contributes in developing better understanding of the degradation mechanisms and improving the overall stability of perovskite solar cells.
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identified the interface between the perovskite and the mesoporous TiO2 scaffold as the area of cell degradation commencement, reporting enhanced stability with the incorporation of an Sb2S3 interlayer at the TiO2/perovskite interface.12 Ducati’s group in situ monitored the changes in morphology and chemical composition with transmission electron microscopy (TEM) and reported the heat-induced degradation of perovskite.13 Schubert’s group observed UV degradation after exposing PSCs to 365 nm UV light for over 1000 h under inert gas at
