DataVXAdvanced Functional MaterialsPaper
journal article·2016-03

An Interface Engineered Multicolor Photodetector Based on n‐Si(111)/TiO2 Nanorod Array Heterojunction

Tao Ji, Qian Liu, Rujia Zou, Yangang Sun, Kaibing Xu, Liwen Sang, Meiyong Liao, Yasuo Koide, Li Yu, Junqing Hu

Advanced Functional Materials· Volume 26· Issue 9
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Source abstract

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 ΔEC, 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 ΔEV. 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.
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Research context

Nanomaterials

OpenAlex topics: Silicon Nanostructures and Photoluminescence · Semiconductor materials and devices · Nanowire Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P.R. China

School of Fundamental Studies Shanghai University of Engineering Science Shanghai 201620 P.R. China

International Center for Material Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

Optical and Electronic Materials Unit National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

Ian Wark Research Institute University of South Australia Mawson Lakes 5095 Australia

Funding

National Natural Science Foundation of China · Key Grant Project of Chinese Ministry of Education · PhD Programs Foundation of the Ministry of Education of China · National 863 Program of China · Science and Technology Commission of Shanghai Municipality · Fundamental Research Funds for the Central Universities · Program Innovative Research Team in University · Shanghai Leading Academic Discipline Project · Program of Introducing Talents of Discipline to Universities

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