Guanidinium Cation Substitution Effects on Perovskite Solar Cells

초록

Combining different cations is a suitable strategy to improve the efficiency and stability of organic-inorganic halide perovskite-based solar cells. In this study, we fabricated and characterized MAPbI3 perovskite films and solar cells containing guanidinium (GA). X-ray diffraction measurements confirmed that partial substitution of GA cations was successfully performed through a solution process. Substitution of a small amount of GA improved the optical properties along with the reduction of defects in the perovskite film. As a result, all photovoltaic parameters were enhanced to achieve a power conversion efficiency of up to 17.23 %. However, excessive GA substitution causes aggregation of low-dimensional GAPbI3, thereby impairing device properties.

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