High open-circuit voltage (VOC) is a key advantage of two-terminal triple-junction solar cells, as the voltages from individual sub-cells add up. To fully harness this potential, it is crucial to identify and minimize voltage losses in each sub-cell.
In this study, we identified the high-bandgap perovskite top cell as the primary source of VOC loss in perovskite/perovskite/silicon triple-junction solar cells. By enhancing the bulk quality of the perovskite and optimizing its interface with the electron transport layer, we significantly improved the top cell’s VOC. As a result, our triple-junction cells achieved an impressive VOC exceeding 3.00 V.
Additionally, we applied sub-cell selective iVoc imaging—for the first time in perovskite-based triple-junction solar cells—to confirm the source of this VOC improvement.
Check out the full paper here:
The Borchert Lab 