Journal
APPLIED SURFACE SCIENCE
Volume 643, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2023.158641
Keywords
Self-powered; UV photodetector; Organic-inorganic; PVK/WO 3 heterojunction; Low temperature
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In this study, a self-powered UV photodetector with high performance and low energy consumption was fabricated. The effect of different films on the performance of the photodetector was investigated.
Ultraviolet (UV) photodetectors have found wide-ranging applications, ranging from optical communications to chemical detection. High performance UV photodetectors that can be self-powered are highly desirable in many applications as they can minimize energy consumption during operation. Herein, a self-powered UV photodetector, which consisted of poly(9-vinylcarbazole) (PVK)/amorphous-WO3 organic-inorganic heterojunction with PEDOT:PSS as a hole transport layer, was fabricated using a two-step method at low temperature. The effect of WO3, PVK and PEDOT:PSS films on the performances of the photodetector was also investigated. Under optimized parameters, the PEDOT:PSS/PVK/WO3 photodetector exhibited a maximum responsivity of 12.41 AW-1, specific detectivity of 1.80 x 1013 Jones, photo-dark current ratio of 103 at reverse bias and typical rectification characteristic when exposed to 365 nm light irradiation. The photoelectric conversion mechanism of this novel PVK/WO3 heterojunction is discussed using energy band diagrams. This work presents a method to produce a high performance WO3-based heterostructure at low temperature, which has the potential for UV imaging.
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