Improved stability and efficiency of perovskite/organic tandem solar cells with an all-inorganic perovskite layer

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 9; no. 35; pp. 19778 - 19787
• Main Authors: Wu, Xin, Liu, Yizhe, Qi, Feng, Lin, Francis, Fu, Huiting, Jiang, Kui, Wu, Shengfan, Bi, Leyu, Wang, Deng, Xu, Fang, Jen, Alex K.-Y, Zhu, Zonglong
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 21.09.2021
• Subjects: Circuits; Energy gap; Fabrication; Irradiation; Open circuit voltage; Perovskites; Photovoltaic cells; Short circuit currents; Short-circuit current; Solar cells; Thermal stability; Ultraviolet radiation
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d0ta12286f

All-inorganic perovskite solar cells (PVSCs) have attracted intensive attention owing to their tunable bandgaps and excellent photo- and thermostability, making them promising absorbers in tandem solar cells (TSCs). Herein, we develop an all-inorganic perovskite/organic TSC with a wide bandgap all-inorganic perovskite CsPbI 2.1 Br 0.9 and a narrow bandgap organic photoactive layer (PM6:Y6) serving as top and bottom sub cells respectively. The fabricated tandem solar cell demonstrated a remarkable PCE of 18.06%, with an open-circuit voltage ( V OC ) of 1.89 V, short-circuit current ( J SC ) of 12.77 mA cm −2 , and fill factor (FF) of 74.81%, which is higher than that of both single junction PVSCs (14.43%) and organic solar cells (14.01%). Moreover, benefiting from the outstanding UV and thermal stability of inorganic perovskites, all-inorganic perovskite-based tandem devices showed superior stability under light and heat, with negligible degradation after 150 h of UV irradiation, 250 h under one sun illumination and 100 h of heating at 80 °C. This work demonstrates that all-inorganic perovskites are an appropriate candidate for the fabrication of efficient and stable TSCs. This work presents high-performance and stable all-inorganic perovskite/organic tandem solar cells with a champion efficiency of 18.06% and excellent stability under light and thermal conditions.