Abstract
In this paper, the TiO2 nanorod arrays (TiO2 NRAs)/PEDOT-type conducting polymers composites were prepared by a simple electrochemical polymerization method and used as materials for ultraviolet (UV) photodetectors. The poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT) were selected as PEDOT-type conducting polymers. The structural, morphology and properties of photocurrent response of PEDOT/TiO2 NRAs and PProDOT/TiO2 NRAs were systematically studied. The results indicated that the polymer film grown on TiO2 NRAs surface presented three-dimensional porous network structure, and there was a strong interaction between polymer film and TiO2 NRAs. The results of the I–V characteristic curve showed that the composites had good rectification behavior. Due to the p-n heterojunction formed between n-type TiO2 NRAs and p-type polymer, both PEDOT/TiO2 NRAs and PProDOT/TiO2 NRAs had photocurrent response performance under 0 V and 1 V bias. Compared with the PEDOT/TiO2 NRAs, the PProDOT/TiO2 NRAs showed better UV photodetection performance, and the rise and fall time were respectively 26.2 s and 37.78 s at a bias of 1 V, while the rise and fall time were respectively 0.49 s and 8.79 s at a bias of 0 V. This research has certain potential and application value in the field of UV photodetectors.
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