Low-temperature processed inorganic hole transport layer for efficient and stable mixed Pb-Sn low-bandgap perovskite solar cells.

Metal halide perovskite solar cells (PSCs) have attracted tremendous attention as an emerging photovoltaic technology due to their high efficiency, low cost and ease of fabrication from earth-abundant materials [1], [2]. We fabricated mixed Pb-Sn low-bandgap perovskite solar cells using NiO SB x sb as HTL with a planar device structure of glass/ITO/NiO SB x sb /perovskite/C SB 60 sb /BCP/Cu (Fig. Our results indicate that NiO SB x sb is a promising HTL for mixed Pb-Sn low-bandgap perovskite solar cells, which sheds light on fabricating highly efficient and stable all-perovskite tandem solar cells. [Extracted from the article]