Impact of crystallinity towards the performance of semi-polar (11–22) GaN UV photodetector

•Semi-polar (11–22) GaN epilayers are successfully synthesized via MOCVD.•Crystalline semi-polar (11–22) GaN has improved the performance of UV photo-detection.•High defect densities have caused the increased of dark current. Crystal engineered semi-polar (11–22) GaN-based UV photodetectors have bee...

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Bibliographic Details
Published in:Materials letters 2021-03, Vol.286, p.129244, Article 129244
Main Authors: Ahmad Makinudin, Abdullah Haaziq, Al-Zuhairi, Omar, Anuar, Afiq, Zainorin, Mohamed Zulhakim, Abu Bakar, Ahmad Shuhaimi, DenBaars, Steven, Supangat, Azzuliani
Format: Article
Language:English
Subjects:
Crystal structure
Crystallinity
Dark current
Epitaxial growth
Gallium nitrides
GaN
Materials science
Photometers
Recovery time
Semi-polar
Thin films
UV photodetector
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Summary:•Semi-polar (11–22) GaN epilayers are successfully synthesized via MOCVD.•Crystalline semi-polar (11–22) GaN has improved the performance of UV photo-detection.•High defect densities have caused the increased of dark current. Crystal engineered semi-polar (11–22) GaN-based UV photodetectors have been fabricated which exhibit two dissimilar photo-responses depending on the crystal quality. The higher crystal quality evaluated via x-ray rocking curve (XRC) exhibited remarkable narrow full width half maximum (FWHM) along [-1–123] and [1–100] of 0.11° (396 arcsec) and 0.28° (1008 arcsec), respectively. Integration of the high crystalline structure with the metal–semiconductor-metal type photodetector resulted in notably lower dark current of 4.6μA. The responsivity value is significantly enhanced from 117 mA/W to 325 mA/W with higher crystalline epilayer. The photo-response of the detector made with the enhanced crystal epilayer is measured to be as low as 170 ms with a recovery time of 241 ms by which is the fastest switching time ever reported in semi-polar (11–22) GaN metal–semiconductor-metal UV photodetector.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.129244