Molecular Design for large-scale Wavelength-selective Organic Photodiodes
발표자
신지영 (한양대학교)
연구책임자
정인환 (한양대학교)
초록
내용
Wavelength-selective organic photodiodes (OPDs) enable full-color imaging. However, polymer-based solution processes face challenges in large-scale fabrication. Therefore, research on vacuum deposition-based OPDs compatible for large-scale is becoming more important, especially focusing on enhancing their narrowband detection performance. In this study, four various electron-withdrawing groups were introduced into the electron-rich cyclopentadithiophene core. The optical properties changed due to intramolecular charge transfer interactions, enabling R-G-B selectivity with minimal structural changes. As a result, the deeper HOMO energy level reduces the dark current, achieving a high external quantum efficiency of approximately 70% and a high specific detectivity of about 2.0 × 10¹² Jones. Furthermore, an organic X-ray sensor with imaging performance comparable to commercial alternatives was successfully fabricated by integrating vacuum-deposited OPDs.