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

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 improv...

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Bibliographic Details
Published in:	Applied physics letters Vol. 121; no. 20
Main Authors:	Liang, Haoqi, Cui, Jiupeng, Yu, Zhihao, Sun, Huabin, Wei, Heming, Zakaria, Rozalina, Li, Binhong, Wu, Jie, Xu, Yong, Tan, Chee Leong
Format:	Journal Article
Language:	English
Published:	Melville American Institute of Physics 14-11-2022
Subjects:	Absorption Applied physics Optical trapping Photodiodes Photometers Quantum efficiency Ultraviolet detectors
Online Access:	Get full text
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Summary:	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 × 1012 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.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/5.0123705