Metal Halide Perovskite Materials for Solar Cells
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석상일 울산과학기술원 Oxide perovskite materials occupy a very important position in the functional materials, which exhibit many excellent properties including ferroelectricity piezoelectric, thermoelectric, antiferromagnetic, giant magnetoresistance, insulation, semiconductor, conduction, and even superconductivity. Similarly, recently, halide perovskite has shown excellent properties in solar cells and is emerging as a promising material in various applications. They are represented by the general formula ABX3 and have the same crystal structure as calcium titanate (CaTiO3), where A and B sites accept inorganic cations of various valency and ionic radius, and X site accommodates anions (halogen or oxygen). In particular, halide perovskites exhibit 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). This excellent property allows the efficiency of perovskite solar cells to reach a level comparable to the efficiency of silicon solar cells studied over a long period of time. In this presentation, I will talk about evolution of perovskite solar cells, based on our results. |