Graphene-enhanced gallium nitride ultraviolet photodetectors under 2 MeV proton irradiation
- Authors
- Miller, Ruth A.; So, Hongyun; Chiamori, Heather C.; Dowling, Karen M.; Wang, Yongqiang; Senesky, Debbie G.
- Issue Date
- Dec-2017
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.111, no.24, pp.1 - 4
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 111
- Number
- 24
- Start Page
- 1
- End Page
- 4
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/18603
- DOI
- 10.1063/1.5005797
- ISSN
- 0003-6951
- Abstract
- The electrical characteristics of gallium nitride (GaN) ultraviolet (UV) photodetectors with graphene and semitransparent Ni/Au electrodes subjected to 2 MeV proton irradiation arc reported and compared. Graphene is shown to have a very high transmittance (87%) in the UV regime (365 nm) compared to semitransparent Ni/Au (3 nm/10 nm) films (32%). Correspondingly, microfabricated graphene/GaN photodetectors showed a much higher pre-irradiation responsivity of 3388 A/W, while that of semitransparent Ni/Au/GaN photodetectors was 351 A/W. For both types of electrodes, intermittent current-voltage measurements performed during 2 MeV proton irradiation showed minimal variation up to a fluence of approximately 3.8 x 10(13)cm(-2). Additionally, Raman spectroscopy of 200keV proton beam, 3.8 x 10(13)cm(-2) irradiated graphene showed minimal disorder with only a 6% increase in I-D/I-G compared to pre-irradiated graphene. These results support the use of graphene-enhanced GaN UV photodetectors in radiation-rich environments such as deep space.
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