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