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- Title
An Interface Engineered Multicolor Photodetector Based on n-Si(111)/TiO<sub>2</sub> Nanorod Array Heterojunction.
- Authors
Ji, Tao; Liu, Qian; Zou, Rujia; Sun, Yangang; Xu, Kaibing; Sang, Liwen; Liao, Meiyong; Koide, Yasuo; Yu, Li; Hu, Junqing
- Abstract
A multicolor photodetector based on the heterojunction of n-Si(111)/TiO2 nanorod arrays responding to both ultraviolet (UV) and visible light is developed by utilizing interface engineering. The photodetector is fabricated via a consecutive process including chemical etching, magnetron sputtering, hydrothermal growth, and assembling. Under a small reverse bias (from 0 to ≈−2 V), only the photogenerated electrons in TiO2 are possible to tunnel through the low barrier of Δ EC, and the device only responses to UV light; as the reverse bias increases, the photogenerated holes in Si also begin to tunnel through the high barrier of Δ EV. As a result, the device is demonstrated to have the capacity to detect both UV and visible lights, which is useful in the fields of rapid detection and multicolor imaging. It has been also observed that the crystal orientation of Si affects the characteristics of bias-controlled spectral response of the n-Si/TiO2 heterojunctions.
- Subjects
PHOTODETECTORS; NANORODS spectra; ETCHING techniques; MAGNETRON sputtering; INDUSTRIAL applications of ultraviolet radiation
- Publication
Advanced Functional Materials, 2016, Vol 26, Issue 9, p1400
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201504464