The vacuum process is scalable and solvent free, yet all-vacuum-deposited perovskite solar cells still trail solution-processed counterparts. Facet-directed co-evaporation yields (100)-oriented mixed-halide wide-bandgap films for efficient, stable single-junction cells and perovskite–silicon tandem cells.
- Xinyi Shen
- Wing Tung Hui
- Henry J. Snaith