Project R-13035

ARLEA- Advanced Recombination Junction Layer Engineering and Application for Up-scalable and Stable Monolithic Perovskite Tandem Solar Cells with Two Different Bottom Cells. (Si-CIGS) (Research)

The future of high-efficient solar cell technologies is tandem applications. Today, over 25% power conversion efficiency (pce) is reached by CIGS-perovskite(PSK), 29% by Si-PSK, and 21% by PSK-PSK tandems. However, soon, when a limit for the pce of tandem solar cells is reached, researchers will start questioning the reason only then, since the focus worldwide now is on creating more efficient solar cells rather than the more profound analysis. This project's primary focus will be the recombination junction, the part where two different types of solar cells meet, of the high-efficient 2Ttandem solar cells: CIGS-PSK and Si-PSK. Therefore, within this project, (i)the type of recombination with various experiments and modeling for both tandem structures will be determined, and (ii)novel strategies will be employed to reduce the recombination (via passivation or improved transparent conductive oxide (TCO) layers). Hence, more efficient tandem solar cells will be produced by a deeper analysis of the critical features beforehand. Today, there is a gap between the cell-to-module efficiency of tandem solar cells. The second aim of this project will be to focus on this and establish innovative solutions. Furthermore, the long-term stability of the added passivation or TCO layer will be studied in-depth. Creating a highefficient tandem solar cell is "the dream"; however, the long-term stability of this solar cell is also crucial.

01 October 2022 - 30 September 2025