A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation

A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation

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Organic-inorganic hybrid halide perovskite solar cells (PSCs) have been a trending topic in recent Throw 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 Ski de fond - Enfant - Bottes - Combi lower charge diffusion rate and higher bandgap energy.Our finding offers an alternative approach to resolving the low stability issue for PSC fabrication.