Improved photoresponse characteristics of a zno-based uv photodetector by the formation of an amorphous sno2 shell layeropen access
- Authors
- Yoo, Junhyuk; Jung, Uijin; Jung, Bomseumin; Shen, Wenhu; Park, Jinsub
- Issue Date
- Sep-2021
- Publisher
- MDPI
- Keywords
- Core–shell structure; Nanostructure; Surface passivation; UV photodetector
- Citation
- Sensors, v.21, no.18, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors
- Volume
- 21
- Number
- 18
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/141023
- DOI
- 10.3390/s21186124
- ISSN
- 1424-8220
- Abstract
- Although ZnO nanostructure-based photodetectors feature a well-established system, they still present difficulties when being used in practical situations due to their slow response time. In this study, we report on how forming an amorphous SnO2 (a-SnO2 ) shell layer on ZnO nanorods (NRs) enhances the photoresponse speed of a ZnO-based UV photodetector (UV PD). Our suggested UV PD, consisting of a ZnO/a-SnO2 NRs core–shell structure, shows a rise time that is 26 times faster than a UV PD with bare ZnO NRs under 365 nm UV irradiation. In addition, the light responsivity of the ZnO/SnO2 NRs PD simultaneously increases by 3.1 times, which can be attributed to the passivation effects of the coated a-SnO2 shell layer. With a wide bandgap (~4.5 eV), the a-SnO2 shell layer can successfully suppress the oxygen-mediated process on the ZnO NRs surface, improving the photoresponse properties. Therefore, with a fast photoresponse speed and a low fabrication temperature, our as-synthesized, a-SnO2-coated ZnO core–shell structure qualifies as a candidate for ZnO-based PDs.
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