Improved stability and efficiency of perovskite/organic tandem solar cells with an all-inorganic perovskite layer. Issue 35 (31st March 2021)

• Record Type: Journal Article
• 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
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 35(2021)
• Page Start: 19778
• Page End: 19787
• Publication Date: 2021-03-31
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta12286f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : 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. Abstract : 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 CsPbI2.1 Br0.9 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.