Article history: There is an increasing interest in harvesting photoejected electrons for highly sensitive photodetectors, Received 1 May 2017 by interfacial engineering rather than the classic semiconductors. However, the widely employed device Received in revised form 27 July 2017 structures involving a p-n junction that causes photogenerated electron-hole separation to enhance the Accepted 4 August 2017 response are usually complex with a high fabrication challenge. Here, we present TiO -based highly efﬁ- Available online 16 August 2017 cient ultraviolet (UV) photodetection by achieving its nanocrystal assembled ﬁlm having high surface defects. The sol-gel derived TiO ﬁlms have been subjected to a post-growth annealing at 500 C in air Keywords: (SA) and vacuum (SB) and one subjected to UV treatment (SC) to tune the surface defects. The UV pho- Low power toresponse results show that the nanocrystal assembled UV cured TiO ﬁlm shows as high as 1.7 × 10 UV UV-to-visible rejection ratio and photo-to-dark current ratio of 1.2 × 10 under 10 V bias and 10 W Photoresponse incident light power. Most interestingly, unprecedently high photo-to-dark current ratio of the order of Low bias Nanocrystal assembled ∼10 at as low as 1 V bias condition and only 10 W
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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