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Enhanced response speed of TiO2 nanoarrays based all solid-state ultraviolet photodetector via SiO2 dielectric layer by Yang, Dongmei (author);Ren, Yuxin (author);Du, Fenqi (author);Hu, Peng (author);Jiao, Yang (author);Teng, Feng (author);Fan, Haibo (author) is a Materials Science article available to read on EtoBox.

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a b s t r a c t All solid-state ultraviolet photodetector based on TiO 2 nanoarrays always suffers from slow response speed, which seriously limits its actual application. In this work, a novel all solid-state hybrid structure ultraviolet photodetector based on nano-tree TiO 2 nanoarrays and SiO 2 dielectric layer was prepared. The response speed of the device can be improved significantly by the addition of SiO 2 layer. The obtained TiO 2 /SiO 2 hybrid device demonstrates large responsivity of 1.15 A/W, high detection sensitivity of 7.74 × 10 13 Jones and fast photoresponse time of 1.13 s/0.75 s for PD4 under UV light illumination. The existence of the SiO 2 layer widen the depletion layer on the surface of TiO 2, which increases the loss rate of the photo-generated carrier and reduces the response time of the device. This device based on nano-tree TiO 2 nanoarrays and SiO 2 layer provides a certain fundamental for the future development of all solid-state photodetectors.

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Author

Yang, Dongmei (author);Ren, Yuxin (author);Du, Fenqi (author);Hu, Peng (author);Jiao, Yang (author);Teng, Feng (author);Fan, Haibo (author)

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Materials Science (Physical Sciences)