Journal
NANOTECHNOLOGY
Volume 25, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/7/075202
Keywords
photoelectrochemical; photoanodes; visible-blind; one-dimensional
Funding
- National Key Basic Research Program of China [2013CB922303, 2010CB833103]
- National Natural Science Foundation of China [60976073, 11274201, 51231007]
- 111 Project [B13029]
- Foundation for Outstanding Young Scientists in Shandong Province [BS2010CL036]
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Nano-branched TiO2 arrays were fabricated on fluorine-doped tin oxide (FTO) glass by a facile two-step chemical synthesis process. Self-powered UV photodetectors based on photoelectrochemical cells (PECs) were assembled using these TiO2 nano-branched arrays as photoanodes. These visible-blind self-powered UV photodetectors exhibit high sensitivity and high-speed photoresponse. Compared with photodetectors based on bare TiO2 nanorod arrays, TiO2 nano-branched arrays show drastically improved photodetecting performance as photoanodes. The photosensitivity increases from 0.03 to 0.22 A W-1 when optimized nano-branched TiO2 arrays are used, corresponding to an incident photon-to-current conversion efficiency higher than 77%. The UV photodetectors also exhibit excellent spectral selectivity and fast response (0.05 s decay time). The improved performance is attributed to a markedly enlarged TiO2/electrolyte contact area and good electron conductivity in the one-dimensional, well-aligned TiO2 nanorod trunk.
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