Novel Self-powered UV-Visible Photodetector with Fast Response and High Photosensitivity Employing Fe:TiO2/n-Si Heterojunction

Lin Sun,1* Chunrui Wang,1* Tao Ji2,3
1Department of Applied Physics and state key laboratory for modification of chemical fibers and polymer materials, Donghua University, 2999 Renmin Rd North, Songjiang District, Shanghai, China
2State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, 2999 Renmin Rd North, Songjiang District, Shanghai, China
3School of Fundamental Studies, Shanghai University of Engineering Science, 333 Long Teng Road, Songjiang District, Shanghai, China
Nano-Micro Conference, 2017, 1, 01073
Published Online: 31 October 2017 (Abstract)
DOI:10.11605/cp.nmc2017.01073
Corresponding Author. Email: Lin Sun, This email address is being protected from spambots. You need JavaScript enabled to view it.; Chunrui Wang, This email address is being protected from spambots. You need JavaScript enabled to view it.

How to Cite

Citation Information: Lin Sun, Chunrui Wang, Tao Ji, Novel Self-powered UV-Visible Photodetector with Fast Response and High Photosensitivity Employing Fe:TiO2/n-Si Heterojunction. Nano-Micro Conference, 2017, 1, 01073 doi: 10.11605/cp.nmc2017.01073

History

Received: 31 May 2017, Accepted: 13 June 2017, Published Online: 31 October 2017

Abstract

A UV-Visible photodetector employing heterojunction between the Fe:TiO2 and Si was fabricated via a facile solution process. The existence of built-in electric field between TiO2 and Si help facilitate the separation of photogenerated electron-hole pairs and regulate the electron transport. Under zero bias, the device exhibited high responsivity of 46 mA/W (350 nm) and 60 mA/W (600 nm) with a 0.5 mw∙cm-2 light irradiation. At a small reverse bias of -0.5V, the quantum efficiency of the heterojunction rise up beyond 100% with a broad wavelength range. The exploring of Fe:TiO2/n-Si heterojunction photodetector demonstrates an ultrasensitive (on/off ratio up to 103), fast (rise/decay time of <10/15 ms), and broad-band (UV-visible) photodetection with no or low external energy supply. Such novel photodetector with Fe:TiO2/n-Si Heterojunction might be potentially useful for relative applications with weak-signal fast detection in UV-visible band.

Fig1

Figure 1. Responsivity and EQE of Fe:TiO2/n-Si heterojunction under each bias in UV-visible band.

 

References

[1] Tao Ji; Qian Liu; Rujia Zou; Yangang Sun; Kaibing Xu; Liwen Sang; Meiyong Liao; Yasuo Koide; Li Yu; Junqing Hu, An Interface Engineered Multicolor Photodetector Based on n-Si(111)/TiO2 Nanorod Array Heterojunction. Advanced Functional Materials. 26, 1400-1410 (2016). doi:10.1002/adfm.201504464
[2] Tao Ji; Ze Cui; Wenlong Zhang; Yunjiu Cao; Yongfang Zhang; Shu-ang He; Mingdong Xu; Yangang Sun; Rujia Zou; Junqing Hu, UV and visible light synergetic photodegradation using rutile TiO2 nanorod arrays based on a p–n Junction. Dalton Transactions. 46, 4296-4302 (2-17). doi:10.1039/C7DT00261K

Open Access

This article is licensed under a Creative Commons Attribution 4.0 International License. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
© The Author(s) 2017

[1] Tao Ji; Qian Liu; Rujia Zou; Yangang Sun; Kaibing Xu; Liwen Sang; Meiyong Liao; Yasuo Koide; Li Yu; Junqing Hu, An Interface Engineered Multicolor Photodetector Based on n-Si(111)/TiO2 Nanorod Array Heterojunction. Advanced Functional Materials. 26, 1400-1410 (2016). doi:10.1002/adfm.201504464
[2] Tao Ji; Ze Cui; Wenlong Zhang; Yunjiu Cao; Yongfang Zhang; Shu-ang He; Mingdong Xu; Yangang Sun; Rujia Zou; Junqing Hu, UV and visible light synergetic photodegradation using rutile TiO2 nanorod arrays based on a p–n Junction. Dalton Transactions. 46, 4296-4302 (2-17). doi:10.1039/C7DT00261K

 

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