De-doping of graphene by Joule heating with water
- Authors
- Park, Joonkyu; Kim, Dong-Whan; Woo, Ju Yeon; Lee, Jun; Han, Chang-Soo
- Issue Date
- 18-11월-2015
- Publisher
- IOP PUBLISHING LTD
- Keywords
- graphene; water de-doping; Joule heating
- Citation
- JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.48, no.45
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Volume
- 48
- Number
- 45
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/91884
- DOI
- 10.1088/0022-3727/48/45/455102
- ISSN
- 0022-3727
- Abstract
- We report the restoration of electrical properties found in graphene field-effect transistors (G-FETs) Joule heated with water. Since polymer contaminates the graphene surface during the transfer process and device fabrication, the graphene becomes p-doped so that we can hardly measure its charge neutrality point (CNP) with a gate voltage even up to 100 V. When the p-doped G-FET covered by water is Joule heated, on the other hand, the CNP is restored almost to the zero gate voltage. Based on the results derived from I-d-V-g characteristics and Raman spectroscopy, we argue that the polymers on graphene were removed whilst it was Joule heated, resulting in high de-doping of the graphene, leading to the easy process for the fabrication of high performance G-FET.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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