Prolonged Nickel Oxide Sol-Gel Stability via High-Energetic Gamma-Ray Irradiation for Maximizing Organic Photodetector Performances
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초록
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This study investigated the use of high-energy gamma (γ)-ray irradiation to stabilize the oxygen reaction of NiOx sol-gel. Cyclic voltammetry analysis showed that the γ-fixing NiOx had a shallower conduction band level and a wider bandgap, contributing to effective electron charge blocking. Turbiscan analysis revealed the highest turbiscan stability index (TSI) for the γ-fixing NiOx. It suggests that γ-ray irradiation fixed the oxygen reaction on the NiOx surface, reducing oxygen defects in the sol-gel. This led to excellent device performance, including a reduction in dark current by over 2 orders with superior detectivity. The findings is based on the more uniform/compact film from the maintained γ-fixing NiOx material properties for over 1000 days after irradiation. Based on this flow, this study demonstrated effectiveness of γ-ray treatment on the oxide sol-gel in details.