High performance ultraviolet photodiode based on thin DPPT-TT donor-acceptor organic polymer

• Main Authors: Liang, Haoqi, Cui, Jiupeng, Yu, Zhihao, Sun, Huabin, Wei, Heming, Zakaria, Rozalina, Li, Binhong, Wu, Jie, Xu, Yong, Tan, Chee Leong
• Format: Article
• Published: AIP Publishing 2022
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.um.edu.my/46169/; https://doi.org/10.1063/5.0123705

A high-performance ultraviolet photodetector based on a thin layer DPPT-TT organic material is experimentally demonstrated. The high absorption of DPPT-TT in the ultraviolet band is attributed to the foundation for a high-performance ultraviolet detector. The device's responsivity can be improved by adequately designing the hole-blocking layer HfO2 and the stepped structure at the bottom contact. Due to the self-filtering and optical trapping structure, the device achieves external quantum efficiency above 100%, even with a thin absorption layer (around 50 nm). The maximum spectral responsivity of the device is 383 A/W, and the corresponding maximum specific detection rate is about 2.79 x 10(12) at a bias voltage of 0.5 V. Our results advocate that the thin organic ultraviolet photodetector promises excellent potential in low-cost ultraviolet-visible light detection and imaging applications. Published under an exclusive license by AIP Publishing.