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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
Science (American Association for the Advancement of Science), 04/2020, Volume: 368, Issue: 6487Journal Article
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.
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