Dark Current Reduction Effects in Tin-Based Perovskites Identified through Device Physics for Efficient Photodetector
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내용
In this study, a tin-based halide perovskite that reacts in the visible and near-infrared range is applied to replace the content of lead in perovskite photodetector (PD). The tin-based perovskite induces lower shunt leakage current and charge injection current due to its longer internal pathways and prevented ion migration. Since tin and iodine ions exhibits the relatively stronger bond strength than that of lead ions, the injection barrier in tin-based perovskite is effectively maintained by minimizing the formation of dipoles as ions move to the interface. Accordingly, the tin-based perovskite PD shows suppressing of dark current, which results in a high signal-to-noise ratio (SNR), an excellent cut-off frequency and detectivity. The discovery of the PD efficacy of tin-based perovskites can amplify the application range of lead-free perovskite materials as well as the development of image sensors.