Graphene-enhanced gallium nitride ultraviolet photodetectors under 2 MeV proton irradiation
- Stanford Univ., CA (United States)
- Hanyang Univ., Seoul (Korea, Republic of)
- 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
Web of Science
Long‐Term, High‐Voltage, and High‐Temperature Stable Dual‐Mode, Low Dark Current Broadband Ultraviolet Photodetector Based on Solution‐Cast r‐GO on MBE‐Grown Highly Resistive GaN
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journal | May 2019 |
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