Advanced Molecular Design for High-Efficiency Vacuum-Processed Color-selective Organic Photodiodes
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초록
내용
Organic photodetectors (OPDs) with tunable optical properties have attracted significant interest for image sensors due to their potential for full-color imaging. In commercial applications, OPDs generally use solution-based processes, which lead to reproducibility issues and limit large-scale production. Therefore, research on vacuum-deposited OPDs is becoming increasingly important, focusing on enhancing narrowband detection performance. In this study, we designed innovative materials for vacuum-deposited OPDs suitable for large-scale production. We synthesized donor materials, CPDT1-4, by introducing electron-withdrawing groups to the electron-rich CPDT core, achieving R-G-B wavelength selectivity without significant structural changes. As a result, we achieved an external quantum efficiency of ~70% and a high specific detectivity of 2.0×10¹² Jones. We successfully fabricated an organic X-ray sensor using vacuum-deposited OPDs, approximating commercial imaging performance.