Research to improve perovskite material coverage on irregular cell surfaces

Two-terminal perovskite and CuIn(Ga)Se2 (CIGS) tandem solar cells have been considered ideal due to their optimal bandgap matching. However, the irregular rough morphology of commercial CIGS prevents performance improvement. Researchers from the People's Republic of China conducted a study on using D-homoserine lactone hydrochloride to improve perovskite material coverage on irregular CIGS surfaces and passivate bulk defects. They also employed surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide to passivate defect sites. Additionally, LiF was used to create a field effect, reducing recombination. According to the study, the perovskite/CIGS tandem solar cell has achieved a power conversion efficiency of 24.6%, one of the highest results for 2-terminal based perovskite or CIGS tandem cells. This validation highlights the potential of the methodology in achieving superior performance in perovskite and CIGS tandem solar cells.