Inorganic tin-based perovskite solar cells: Modeling and performance analysis of hole transport layer-free structures.

[Display omitted] • An inorganic tin-based perovskite solar cell hole transport layer-free was designed. • Excessive thickness of the absorber layer affects the carrier diffusion length and recombination. • The higher doping concentration is beneficial to the increase of photoelectric conversion efficiency. • Excessive defect density leads to an increase in the total recombination rate as well as a decrease in carrier lifetime. • A higher work function may enhance the built-in voltage as well as improve the collection efficiency of photogenerated carriers. In this work, based on CsSnI 3 , we propose a hole transport layer-free perovskite solar cell(PSC), whose electron transport material(ETM) consists of TiO 2 , PCBM and C 60. The solar cell was optimized by varying absorber layer thickness, defect density, doping concentration, and working temperature, which resulted in a final structure performance improvement of about 11 %, where V OC = 1.26 V, J SC = 26.519 mA/cm2, FF = 90.19 %, and PCE = 30.17 %. Compared with the previous theoretical and experimental organic–inorganic PSCs, the photovoltaic conversion efficiency of our designed solar cells has been greatly improved. In addition, the quantum efficiency reaches up to 90 % and remains over 50 % in the near 900 nm wavelength range. [ABSTRACT FROM AUTHOR]