Four-Terminal Tandem Based on a PM6:L8-BO Transparent Solar Cell and a 7 nm Ag Layer Intermediate Electrode
Francisco Bernal-Texca, Jordi Martorell (2024). Four-Terminal Tandem Based on a PM6:L8-BO Transparent Solar Cell and a 7 nm Ag Layer Intermediate Electrode. Solar RRL, n/a(n/a), 2300728. https://doi.org/https://doi.org/10.1002/solr.202300728
Abstract
Researchers widely follow the two-terminal tandem cell configuration to overcome transmission and thermalization losses from single-junction solar cells. Unfortunately, the need to match the current from both cells, in addition to the fabrication of an interlayer with excellent optical and electronic performances, makes such two-terminal configurations a challenging approach. Herein, the fabrication of a four-terminal tandem incorporating a front transparent cell made using a 7 nm Ag back electrode and a PM6:L8-BO blend which exhibits a bandgap close to the optimal according to the detailed balance theory is reported. The opaque back cell of this tandem configuration uses a PTB7-Th:O6T-4F blend. Configuring the two cells in a four-terminal device and separating them with a WO3/LiF/WO3 multilayer, which provides an optimal light absorption distribution, achieves a 16.94% power conversion efficiency
