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

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.

Source: ScienceNOW - April 8, 2020 Category: Science Authors: Kim, D., Jung, H. J., Park, I. J., Larson, B. W., Dunfield, S. P., Xiao, C., Kim, J., Tong, J., Boonmongkolras, P., Ji, S. G., Zhang, F., Pae, S. R., Kim, M., Kang, S. B., Dravid, V., Berry, J. J., Kim, J. Y., Zhu, K., Kim, D. H., Shin, B. Tags: Materials Science r-articles Source Type: news