Perovskite solar cells (PSCs) with an inverted planar architecture have gained enormous attention due to their easy fabrication, simplified device structure, and compatibility with flexible substrates, large-scale production, or tandem cells. The focus of this talk will be on the development of high-performance single-junction inverted PSCs based on a low cost and solution-processable hole transport layer poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine] (poly-TPD). The devices have been systematically investigated, consisting of fabrication and optimization, interface modification, and long-term stability. The study aims to increase the open-circuit voltage and power conversion efficiency of the fabricated devices, and disclose their degradation pathway through a range of optical and electrical characterization.
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