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

Daehan Kim, Hee Joon Jung, Ik Jae Park, Bryon W. Larson, Sean P. Dunfield, Chuanxiao Xiao, Jekyung Kim, Jinhui Tong, Passarut Boonmongkolras, Su Geun Ji, Fei Zhang, Seong Ryul Pae, Minkyu Kim, Seok Beom Kang, Vinayak Dravid, Joseph J. Berry, Jin Young Kim, Kai Zhu, Dong Hoe Kim, Byungha Shin

Research output: Contribution to journalArticlepeer-review

421 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
Issue number6487
Publication statusPublished - 2020 Apr 10
Externally publishedYes

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