Abstract
Inorganic metal oxides with the merits of high carrier transport capability, low cost and superior chemical stability have largely served as the hole transport layer (HTL) in perovskite solar cells (PSCs) in recent years. Among them, ternary metal oxides have gradually attracted attention because of the wide tenability of the two inequivalent cations in the lattice sites that offer interesting physicochemical properties. In this work, ZnCo2O4 nanoparticles (NPs) were prepared by a chemical precipitation method and served as the HTL in inverted PSCs. The device based on the ZnCo2O4 NPs HTL showed better efficiency of 12.31% and negligible hysteresis compared with the one using PEDOT:PSS film as the HTL. Moreover, the device sustained 85% of its initial efficiency after 240 h storage under a halogen lamps matrix exposure with an illumination intensity of 1000 W/m2, providing a powerful strategy to design long term stable PSCs for future production.
Highlights
Inorganic metal oxides with the merits of high carrier transport capability, low cost and superior chemical stability have largely served as the hole transport layer (HTL) in perovskite solar cells (PSCs) in recent years
Perovskites are considered as ideal photovoltaic materials in solar cells due to their high absorption in the visible spectrum[3], long carrier diffusion length[4], high carrier mobility[5], low exciton binding energy[6], tunable bandgaps by exchanging atomic composition[7,8], large area production and low cost owing to solution processability
The results demonstrate that the device based on ZnCo2O4 NPs has a higher photon-to-electron conversion capability from 300 to 750 nm compared to that based on PEDOT:PSS
Summary
Inorganic metal oxides with the merits of high carrier transport capability, low cost and superior chemical stability have largely served as the hole transport layer (HTL) in perovskite solar cells (PSCs) in recent years. The device with the configuration of FTO/HTL/perovskite/TBABF4-doped PC61BM/PEI/Ag was fabricated and evaluated, while ZnCo2O4 NPs layer or PEDOT:PSS film were used as the HTL for comparison.
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