High performance, self-powered UV-photodetector based on ultrathin, transparent, SnO2–TiO2 core–shell electrodes

• Published in: Journal of alloys and compounds Vol. 616; pp. 510 - 515
• Main Authors: Gao, Caitian, Li, Xiaodong, Zhu, Xupeng, Chen, Lulu, Wang, Youqing, Teng, Feng, Zhang, Zhenxing, Duan, Huigao, Xie, Erqing
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.12.2014; Elsevier
• Subjects: Applied sciences; Electronics; Exact sciences and technology; Optoelectronic devices; Photoelectrochemical; Self-powered; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; SnO2 nanosheet; SnO2–TiO2 core shell; UV photodetector; UV photodetector; Self-powered; SnO2–TiO2 core shell; Photoelectrochemical; SnO2 nanosheet; High performance; core shell; Nanoplate; Transparency; Core shell structure; Photodetector; Electrodes; Ultraviolet detector; Nanoneedle; Response time; SnO; Tin oxide; Electron mobility; TiO; Titanium oxide; nanosheet; Heterostructures
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.07.171

•An ultrathin, transparent SnO2–TiO2 core–shell structure was developed.•This structure was used in self-powered UVPDs.•UVPDs deliver large responsivity (0.6 A/W) and high on/off ratio (440,563%). We have fabricated SnO2 nanosheet film directly on conductive glass and further designed branched TiO2 nanoneedles on SnO2 nanosheets, forming a heterojunction core–shell structure. The resultant ultrathin and high transparency film can serve as the fast electron transport network for a new developed photoelectrochemical cell based UV photodetector. The UV photodetector shows great responsivity (0.6A/W); high on/off ratio of the Jsc signal (440,563%); very fast response (0.02s for rise time and 0.004s for decay time) under 40mWcm−2 UV irradiation. Compared with the previous reported devices, our detector emerges comparable and even better self-powered UV light detecting properties just using less material.