A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation
AbstractOrganic-inorganic hybrid halide perovskite solar cells (PSCs) have been a trending topic in recent years. Significant progress has been made to increase their power conversion efficiency (PCE) to more than 20%. However, the poor stability of PSCs in both working and non-working conditions results in rapid degradation through multiple environmental erosions such as water, heat, and UV light. Attempts have been made to resolve the rapid-degradation problems, including formula changes, transport layer improvements, and encapsulations, but none of these have effectively resolved the dilemma. This paper reports our findings on adding inorganic films as surface-passivation layers on top of the hybrid perovskite materials, which not only enhance stability by eliminating weak sites but also prevent water penetration by using a water-stable layer. The surface-passivated hybrid perovskite layer indicates a slight increase of bandgap energy (Eg=1.76 eV), compared to the original methylammonium lead iodide (MAPbI3, Eg=1.61 eV) layer, allowing for more stable perovskite layer with a small sacrifice in the photoluminescence property, which represents a lower charge diffusion rate and higher bandgap energy. Our finding offers an alternative approach to resolving the low stability issue for PSC fabrication.
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Tai, E.G.; Wang, R.T.; Chen, J.Y.; Xu, G. A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation. Crystals 2019, 9, 83.
Tai EG, Wang RT, Chen JY, Xu G. A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation. Crystals. 2019; 9(2):83.Chicago/Turabian Style
Tai, Edward Guangqing; Wang, Ryan Taoran; Chen, Jason Yuanzhe; Xu, Gu. 2019. "A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation." Crystals 9, no. 2: 83.
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