IBS Publications Repository: Improving Radio Frequency Transmission Properties of Graphene via Carrier Concentration Control toward High Frequency Transmission Line Applications

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Improving Radio Frequency Transmission Properties of Graphene via Carrier Concentration Control toward High Frequency Transmission Line Applications

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Title: Improving Radio Frequency Transmission Properties of Graphene via Carrier Concentration Control toward High Frequency Transmission Line Applications

Author(s): Jae Hoon Yang; Hyoung Woo Yang; Byoung Ok Jun; Jeong Hee Shin; Seunguk Kim; A‐Rang Jang; Seong In Yoon; Hyeon Suk Shin; Deoksoo Park; Kyungho Park; Duhee Yoon; Jung Inn Sohn; SeungNam Cha; Dae Joon Kang; Jae Eun Jang

Subject: amorphous carbon, ; charge transfer, ; doping, ; graphene, ; RF transmission line

Abstract: Graphene has been gradually studied as a high-frequency transmission line material owing to high carrier mobility with frequency independence up to a few THz. However, the graphene-based transmission lines have poor conductivity due to their low carrier concentration. Here, it is observed that the radio frequency (RF) transmission performance could be severely hampered by the defect-induced scattering, even though the carrier concentration is increased. As a possible solution, the deposition of the amorphous carbon on the graphene is studied in the high-frequency region up to 110 GHz. The DC resistance is reduced by as much as 60%, and the RF transmission property is also enhanced by 3 dB. Also, the amorphous carbon covered graphene shows stable performance under a harsh environment. These results prove that the carrier concentration control is an effective and a facile method to improve the transmission performance of graphene. It opens up the possibilities of using graphene as interconnects in the ultrahigh-frequency region. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim