Enhanced cation interaction in perovskites for efficient tandem solar cells with silicon

作者：Esma Ugur, Ahmed Ali Said, Pia Dally, Shanshan Zhang, Christopher E. Petoukhoff, Diego Rosas Villalva, Shynggys Zhumagali, Bumın K. Yildırım, Arsalan Razzaq, Shruti Sarwade, Aren Yazmaciyan, Derya Baran, Frédéric Laquai, Caner Değer, İlhan Yavuz, Thomas G. Allen, Erkan Aydın, Stefaan De Wolf · 发表于：Science · 年份：2024 · DOI：10.1126/science.adp1621 · 被引用次数：227 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic Electronics and Photovoltaics

To achieve the full potential of monolithic perovskite/silicon tandem solar cells, crystal defects and film inhomogeneities in the perovskite top cell must be minimized. We discuss the use of methylenediammonium dichloride as an additive to the perovskite precursor solution, resulting in the incorporation of in situ–formed tetrahydrotriazinium (THTZ-H + ) into the perovskite lattice upon film crystallization. The cyclic nature of the THTZ-H + cation enables a strong interaction with the lead octahedra of the perovskite lattice through the formation of hydrogen bonds with iodide in multiple directions. This structure improves the device power conversion efficiency (PCE) and phase stability of 1.68 electron volts perovskites under prolonged light and heat exposure under 1-sun illumination at 85°C. Monolithic perovskite/silicon tandems incorporating THTZ-H + in the perovskite photo absorber reached a 33.7% independently certified PCE for a device area of 1 square centimeter.