Publication date: 31st May 2020
Recent studies have shown that charge transport interlayers with low gas permeability can significantly increase operational lifetime of perovskite solar cells while serving as a barrier for migration of volatile decomposition products from the photoactive layer. Herein we present a hybrid hole-transport layer (HTL) comprised of conventional p-type polytriarylamine (PTAA) polymer and vanadium (V) oxide (VOx). Devices assembled in n-i-p configuration with PTAA/VOx as a top HTL reach up to 20% efficiencies while using various perovskite materials and metal oxide electron transport layers. Furthermore, solar cells with the designed hybrid PTAA/VOx hole-transport interlayer show no significant degradation over 4500 h of light soaking. On the contrary, the reference cells using PTAA/MoOx as HTL lose ~50% of their initial efficiency under the same aging conditions. To unravel the origin of the enhanced device stability clearly associated with the incorporation of vanadium oxide, we explored the behavior of the bilayer stacks HTL/MAPbI3 with various HTL compositions. It has been shown that MoOx strongly facilitates perovskite decomposition, which cannot be completely avoided even using thin PTAA interlayer. On the contrary, MAPbI3 films were quite tolerant to VOx and show insignificant decomposition under the same conditions. Our results demonstrate that the application of PTAA/VOx hybrid hole-transport layer enables long-term operational stability of perovskite solar cells thus bringing them closer to commercial applications.
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