Attachable freezing-delayed surfaces for ultraviolet sensing using GaN photodetector at low temperature in air
- Authors
- So, Hongyun; Park, Woosung
- Issue Date
- Apr-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Gallium nitride; Pyramidal surface; Delayed freezing; Frost formation; Ultraviolet photodetectors
- Citation
- APPLIED SURFACE SCIENCE, v.473, pp.261 - 265
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 473
- Start Page
- 261
- End Page
- 265
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14282
- DOI
- 10.1016/j.apsusc.2018.11.196
- ISSN
- 0169-4332
- Abstract
- The enhanced optical sensitivity of gallium nitride (GaN) ultraviolet (UV) photodetectors is demonstrated using attachable and hydrophobic freezing-delayed surfaces. The GaN surface attached to microfabricated surfaces with an array of pyramid structures reduced the surface reflectance compared with that of bare GaN surface (similar to 43.3% decrease at 365 nm wavelength). In addition, as the operation temperature decreased, the hydrophobic pyramid microstructures prevented rapid frost formation by generating dispersed and small-sized frosts (ice crystals). Consequently, the photodetectors fabricated using hydrophobic surfaces with pyramid microstructures showed higher sensitivity (similar to 48.5% increase in the temperature range of - 14 degrees C to 0 degrees C) compared to the photodetectors on bare GaN surfaces, supporting the use of hydrophobic surfaces composed of microstructures for UV sensing with higher sensitivity in low-temperature environments.
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