Highly sensitive wide bandwidth photodetectors using chemical vapor deposited graphene

A photodetector generating a nearly constant photocurrent in a very wide spectral range from ultraviolet (UV) to infrared has been demonstrated using chemical vapor deposited (CVD) graphene. Instability due to a photochemical reaction in the UV region has been minimized using an Al2O3 passivation la...

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Bibliographic Details
Published in:Applied physics letters 2014-04, Vol.104 (16)
Main Authors: Goo Kang, Chang, Kyung Lee, Sang, Jin Yoo, Tae, Park, Woojin, Jung, Ukjin, Ahn, Jinho, Hun Lee, Byoung
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied physics
Chemical vapor deposition
Graphene
Optical interconnects
Organic chemistry
Photochemical reactions
Photoelectric effect
Photoelectric emission
Photometers
Product development
Pyrolytic graphite
Stability
Ultraviolet spectra
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Summary:A photodetector generating a nearly constant photocurrent in a very wide spectral range from ultraviolet (UV) to infrared has been demonstrated using chemical vapor deposited (CVD) graphene. Instability due to a photochemical reaction in the UV region has been minimized using an Al2O3 passivation layer, and a responsivity comparable to that of Highly Ordered Pyrolytic Graphite graphene photodetectors of ∼8 mA/W has been achieved at a 0.1 V bias, despite high defect density in the CVD graphene. A highly sensitive multi-band photodetector using graphene has many potential applications including optical interconnects, multi-band imaging sensors, highly sensitive motion detectors, etc.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4872267