Journal
ACS NANO
Volume 9, Issue 5, Pages 5093-5103Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00212
Keywords
gold oxide (AuOx); graphene; transparent; photodetector; heterojunction; flexible device; bifacial operation
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST-103-2221-E-002-041-MY3, MOST-103-2221-E-002-092-MY3]
Ask authors/readers for more resources
In this study, we combine graphene with gold oxide (AuOx), a transparent and high-work-function electrode material, to achieve a high-efficient, low-bias, large-area, flexible, transparent, broadband, and bifacial-operable photodetector. The photodetector operates through hot electrons being generated in the graphene and charge separation occurring at the AuOx graphene heterojunction. The large-area graphene covering the AuOx electrode efficiently prevented reduction of its surface; it also acted as a square-centimeter-scale active area for light harvesting and photodetection. Our graphene/AuOx photodetector displays high responsivity under low-intensity light illumination, demonstrating picowatt sensitivity in the ultraviolet regime and nanowatt sensitivity in the infrared regime for optical telecommunication. In addition, this photodetector not only exhibited broadband (from UV to IR) high responsivity-3300 A W-1 at 310 nm (UV), 58 A W-1 at 500 nm (visible), and 9 A W-1 at 1550 nm (lR) but also required only a low applied bias (0.1 V). The hot-carrier-assisted photoresponse was excellent, especially in the short-wavelength regime. In addition, the graphene/AuOx photodetector exhibited great flexibility and stability. Moreover, such vertical heterojunction-based graphene/Au05 photodetectors should be compatible with other transparent optoelectronic devices, suggesting applications in flexible and wearable optoelectronic technologies.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available