Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 39, Pages 25645-25649Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05791
Keywords
field-effect transistors; radio frequency; self-aligned; maximum oscillation frequency; parasitical resistance
Funding
- MOST [2013CBA01604, 2011CB932704]
- NSFC [61222402, 61574101]
- Ten Thousand Talents Program for Young Talents
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Graphene is a promising candidate in analog electronics with projected operation frequency well into the terahertz range. In contrast to the intrinsic cutoff frequency (f(T)) of 427 GHz, the maximum oscillation frequency (f(max)) of graphene device still remains at low level, which severely limits its application in radio frequency amplifiers. Here, we develop a novel transfer method for chemical vapor deposition graphene, which can prevent graphene from organic contamination during the fabrication process of the devices. Using a self-aligned gate deposition process, the graphene transistor with 60 nm gate length exhibits a record high f(max), of 106 and 200 GHz before and after de-embedding, respectively. This work defines a unique pathway to large-scale fabrication of high-performance graphene transistors, and holds significant potential for future application of graphene-based devices in ultra high frequency circuits.
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