Abstract
Organometal halide perovskites (OHPs) have garnered considerable attention as materials for next-generation solar cells. Although the power conversion efficiencies of solar cells with OHPs are comparable to those of the existing solar cells, their durability must be improved for practical use based on a deep understanding of their basic properties. During the last decade, various methods, such as composition control, alkali metal doping, and surface passivation, were used to increase the durability of OHPs. In this study, the effects of K-doping on the thermal stability of mixed OHPs are investigated. The activation energies of the mixed OHPs with and without K-doping are found to be 128.4 ± 5.2 and 92.9 ± 9.8 kJ/mol, respectively. Furthermore, the Johnson–Mehl–Avrami model is adopted to the in situ X-ray diffraction measurement data, the results of which indicate that K-doped OHPs can be stabilized to such an extent that they do not decompose after 10,000 h of heating at 85 °C.
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