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Pre-Embedded Potassium Acetate-Modified SnO2 Electron Transfer Layer for Efficient and Durable Perovskite Solar Cells
Lina Qin1, Mengfei Zhu1, Min Zhang1
1State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, Suzhou Key Laboratory of Green Intelligent Manufacturing of New Energy Materials and Devices, Tianchang New Materials and Energy Technology Research Center, Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
Abstract:
Perovskite solar cells (PSCs) have garnered significant attention due to their exceptional photovoltaic performances. However, their power conversion efficiency and stability are significantly hindered by lattice defects and nonradiative recombination losses at the interface between the perovskite film and electron transport layer (ETL). Herein, we report the incorporation of multifunctional potassium acetate (KAc) into SnO2 ETL. Through thermal diffusion of K+ and CH3COO- during annealing, these ions electrostatically penetrate the surface and grain boundary, effectively passivating the formation of bulk defects. The resulting KAc-SnO2 ETL exhibited uniformity, low defect density, and high conductivity, providing an ideal ETL film for the subsequent deposition of perovskite films, thereby enhancing interfacial charge transfer and device efficiency. The optimized device achieved a PCE of 21.76%, a 14% increase over the control device (19.16%), and retained 88.9% of its initial PCE after 1000 h, offering a promising approach for scalable manufacturing in the perovskite industry.
