Performance Comparison between the Nanoporous NiO _x Layer and NiO _x Thin Film for Inverted Perovskite Solar Cells with Long-Term Stability.

ABSTRACT: The development of hole-transport layers (HTLs) that elevate charge extraction, improve perovskite crystallinity, and decrease interfacial recombination is extremely important for enhancing the performance of inverted perovskite solar cells (PSCs). In this work, the nanoporous nickel oxide (NiO _x ) layer as well as NiO _x thin film was prepared via chemical bath deposition as the HTL. The sponge-like structure of the nanoporous NiO _x helps to grow a pinhole-free perovskite film with a larger grain size compared to the NiO _x thin film. The downshifted valence band of the nanoporous NiO _x HTL can improve hole extraction from the perovskite absorbing layer. The device based on the nanoporous NiO _x layer showed the highest efficiency of 13.43% and negligible hysteresis that was better than the one using the NiO _x thin film as the HTL. Moreover, the PSCs sustained 80% of their initial efficiency after 50 days of storage. This study provides a powerful strategy to design PSCs with high efficiency and long-term stability for future production.

SUBMITTER: Huang ZW 

PROVIDER: S-EPMC8223400 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature