Abstract
ABSTRACT Perovskite solar cells (PSCs) have shown power conversion efficiency (PCE) up to 25.5%,but they are still struggling with their poor environmental stability. We have improvedthe ecological stability of un-encapsulated PSCs via interface modification of the topmetal electrode. We used CH3NH3PbI3-xClx perovskite as the light absorber and Ag metal as the top electrode. The interfaceof Ag electrode was modified by introducing a thin layer of MoOx/Al before Ag. We observed that MoOx/Al interlayer before Ag imparts better stability to the devices than conventional Ag electrode only. We found that MoOx/Al interlayer impedes the diffusion of oxygen and metalelectrode intothe perovskite film and considerably halts the device degradation upon beingkept for about 350 h under laboratory ambient conditions (room temperature 25±2oC and humidity 40±5%). This work mainly highlights the role of interfaces in PSCs degradation, and will help to addressthe stability issues in PSCs.
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