Design and Optimization of High‐Efficiency Double‐Layer CuO Perovskite Solar Cells

In this article, the optical properties of single‐junction perovskite solar cells (PSCs) under AM1.5G sunlight are studied using solar cell capacitance simulator‐1D and finite‐difference time‐domain methods. The effect of CuO hole transport layer on the light absorption efficiency of solar cells, as well as the influence of MASnI 3 perovskite layer thickness on the photovoltaic conversion efficiency and quantum efficiency of solar cells, is investigated. The results show that under the same conditions, CuO improves its light absorption performance, demonstrating its important role in enhancing light absorption efficiency. Moreover, there is no linear relationship between the thickness of the MASnI 3 layer and the photoelectric conversion efficiency, and deviations from the optimal thickness can lead to a decrease in efficiency. The study finds that the proposed double‐layer CuO PSC has a total thickness of 900 nm and a light absorption efficiency of 92.73%. When the thickness of the MASnI 3 active layer is 400 nm, its J sc is 29.27 mA cm − 2 , V oc is 0.993 V, and the power conversion efficiency reaches 25.27%. This study has made discoveries about the multifaceted use of the same material in reducing cell thickness, laying the groundwork for the realization of more efficient, thinner, and lighter PSCs.