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Title: Graphene-enhanced gallium nitride ultraviolet photodetectors under 2 MeV proton irradiation

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5005797· OSTI ID:1425766
 [1];  [2];  [1];  [1];  [3];  [1]
  1. Stanford Univ., CA (United States)
  2. Hanyang Univ., Seoul (Korea, Republic of)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The electrical characteristics of gallium nitride (GaN) ultraviolet (UV) photodetectors with graphene and semitransparent Ni/Au electrodes subjected to 2 MeV proton irradiation are 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 made during 2 MeV proton irradiation showed minimal variation up to a fluence of approximately 3.8 × 1013 cm-2. Additionally, Raman spectroscopy of 200 keV proton beam, 3.8 × 1013 cm-2 irradiated graphene showed minimal disorder with only a 6% increase in ID/IG compared to pre-irradiated graphene. These results support the use of graphene-enhanced GaN UV photodetectors in radiation-rich environments such as deep space.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1425766
Alternate ID(s):
OSTI ID: 1412615
Report Number(s):
LA-UR-17-30470; TRN: US1802160
Journal Information:
Applied Physics Letters, Vol. 111, Issue 24; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (1)