Self-powered, transparent, flexible, and solar-blind deep-UV detector based on surface-modified TiO2 nanoparticles
- Authors
- HOANG, TRAN MANH; Bae, Jong-Seong; Hur, Jaehyun
- Issue Date
- Dec-2022
- Publisher
- ELSEVIER
- Keywords
- TiO2 nanoparticle thin film; O vacancies; Self-powered operation; Solar-blind UV detection; Transparent; Wearable electronics
- Citation
- APPLIED SURFACE SCIENCE, v.604
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 604
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/86096
- DOI
- 10.1016/j.apsusc.2022.154528
- ISSN
- 0169-4332
- Abstract
- Titanium oxide (TiO2) has been widely used as a low-cost, chemically stable, and biologically inert semiconductor for many applications. However, there are a limited number of studies on the application of TiO2 for deep-UV photodetection, which has potential environmental and military applications. In this study, we introduce a facile sol-gel method followed by post-modification with acetic acid (HAc) to prepare wide-bandgap anatase TiO2 (3.83 eV) for use as a solar-blind deep-UV photoabsorber. The beneficial effects of simple postmodification on the structural, optical, and electrical properties of TiO2 were comprehensively investigated. When TiO2 nanoparticles are functionalized by an appropriate number of HAc, O vacancies in TiO2 are significantly reduced while the bandgap is increased with reduced particle size. As a result, the HAc-modified TiO2 based deep-UV photodetector exhibits high specific detectivity, fast response time, and R254:R365 rejection at zero bias. Furthermore, the device displays good stability with a nearly constant photoresponse even after one month of storage and under stringent bending strain. The average visible transmittance of the device reaches as high as 80%. The results suggest that the device can be used as an efficient TiO2-based solution-processable solar-blind deep-UV photodetector, with self-powered operability, wearability, and transparency.
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Collections - 공과대학 > 화공생명공학과 > 1. Journal Articles
- IT융합대학 > 전기공학과 > 1. Journal Articles
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