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Organics Filled One-Dimensional TiO2 Nanowires Array Ultraviolet Detector with Enhanced Photo-Conductivity and Dark-Resistivity

Abstract

A heterojunction photo-conductive ultraviolet (UV) detector was developed basing on TiO2 nanowires array (NWA) surrounded by N,N'-Bis-(1-naphthalenyl)-N,N'-bis-phenyl-(1,1'-biphenyl)-4,4'-diamine (NPB). The novel and effective two-steps method of static infusion and dynamic solution-cleaning were employed to fill the NPB into TiO2 NWA gaps and simultaneously remove unwelcomed top NPB layer. The device fabricated with two-steps method exhibited optimal performance compared to TiO2/NPB device with top NPB layer and TiO2 NWA device. In dark, the TiO2/NPB heterojunction device without top NPB possesses the capacity of depleting majority carriers, providing the improved dark-resistivity to limit the dark current (Id). Under UV illumination, the depleting effect could be eliminated by the dissociation and accumulation of photo-generated carrier between pn heterojunction, leading to the increased carrier density and photo-conductivity. It clears up the high barrier due to the removal of top NPB layer, which is beneficial for better hot electrons transport than device with top NPB layer under illumination, achieving an enhanced light current (Il) to Id ratio of 1.67×104. A simple technology is provided to prepare organic-inorganic hybrid one-dimensional array heterostructure, which plays remarkable role in the working process of UV detector, enhancing photo-conductivity and dark-resistivity of device.

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Publication details

The article was received on 13 May 2017, accepted on 08 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR03408C
Citation: Nanoscale, 2017, Accepted Manuscript
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    Organics Filled One-Dimensional TiO2 Nanowires Array Ultraviolet Detector with Enhanced Photo-Conductivity and Dark-Resistivity

    D. Zhang, C. Liu, B. Yin, R. Xu, J. Zhou, X. Zhang and S. Ruan, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03408C

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