Efficient, stable silicon tandem cells enabled by anion-engineered wide-bandgap perovskites

• Published in: Science (American Association for the Advancement of Science) Vol. 368; no. 6487; pp. 155 - 160
• Main Authors: Kim, Daehan, Jung, Hee Joon, Park, Ik Jae, Larson, Bryon W, Dunfield, Sean P, Xiao, Chuanxiao, Kim, Jekyung, Tong, Jinhui, Boonmongkolras, Passarut, Ji, Su Geun, Zhang, Fei, Pae, Seong Ryul, Kim, Minkyu, Kang, Seok Beom, Dravid, Vinayak, Berry, Joseph J, Kim, Jin Young, Zhu, Kai, Kim, Dong Hoe, Shin, Byungha
• Format: Journal Article
• Language: English
• Published: United States The American Association for the Advancement of Science 10-04-2020; American Association for the Advancement of Science (AAAS)
• Subjects: Additives; Anions; Bromine; Efficiency; Electrical properties; Illumination; Iodides; Iodine; Perovskites; Photovoltaic cells; Silicon; Solar cells
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.aba3433

Maximizing the power conversion efficiency (PCE) of perovskite/silicon tandem solar cells that can exceed the Shockley-Queisser single-cell limit requires a high-performing, stable perovskite top cell with a wide bandgap. We developed a stable perovskite solar cell with a bandgap of ~1.7 electron volts that retained more than 80% of its initial PCE of 20.7% after 1000 hours of continuous illumination. Anion engineering of phenethylammonium-based two-dimensional (2D) additives was critical for controlling the structural and electrical properties of the 2D passivation layers based on a lead iodide framework. The high PCE of 26.7% of a monolithic two-terminal wide-bandgap perovskite/silicon tandem solar cell was made possible by the ideal combination of spectral responses of the top and bottom cells.