Inorganic-organic Hybrid Halide Perovskite Solar Cells: Evolution and Issues = Inorganic-organic Hybrid Halide Perovskite Solar Cells: Evolution and Issues

다국어 초록 (Multilingual Abstract)

The general formula AMX3 of inorganic-organic hybrid perovskite materials (A: organic cation, methylammonium (MA) or formamidinium (FA), M: metal, X: halide anion, Br, I) exhibits beneficial properties for high-performance photovoltaic systems such as a suitable band gap (1.5-1.4 eV), high absorption coefficient ( 10⁴-10⁵ cm^-1), low exciton binding energy (< 50 meV), and long charge-carrier diffusion length (~175 μm). In addition, these materials exhibit easy crystallization at low-temperature by solution processing, resulting in their low cost. Based on above distinct properties of perovskite materials, we have designed a new photovoltaic platform for efficient perovskite solar cells (PSCs). The performance have been remarkably increased to more than 22% by introducing a mediator to retard the rapid crystallization between organic cations and PbI2, and manipulate the chemical composition of the perovskites via solvent engineering, intramolecular exchange process, and defect engineering, making these routs attractive for attaining low-cost and high-performance devices. Although perovskite solar cells have improved efficiency in the short term, a variety of problems such as long-term stability, the use of nontoxic materials, and large-area modularization must be addressed for commercialization. In this presentation, I will introduce the presenters' work to improve the efficiency and long-term stability of PSCs and discuss future challenges.