Accelerated Optimization of TiO2/Sb2Se3 Thin Film Solar Cells by High‐Throughput Combinatorial Approach

Abstract Sb 2 Se 3 , a V 2 ‐VI 3 compound semiconductor, has attracted extensive research attention in photovoltaics due to its non‐toxicity, low cost and earth‐abundant constituents. Herein, a combinatorial approach to optimize the performance of TiO 2 /Sb 2 Se 3 thin film photovoltaics is employed. By simultaneously conducting a series of experiments in parallel rather than one after another, combinatorial strategy increases experimental throughput and reduces personnel costs. Key parameters such as TiO 2 thickness, post‐annealing temperature and Sb 2 Se 3 thickness are identified as 65 nm, 450 °C and 850 nm through the combinatorial approach. Finally, in combination with (NH 4 ) 2 S back surface cleaning, TiO 2 /Sb 2 Se 3 solar cells with 5.6% efficiency and decent stability are obtained, showcasing the power of high‐throughput strategy for accelerating the optimization of Sb 2 Se 3 photovoltaics.