Dynamic modulation of the Fermi energy in suspended graphene backgated devices

Massimiliano Migliorato, Umberto Monteverde, Omar Mhaidi Dawood Dawood, Mohamed Missous, James Sexton, Hong Yeol Kim, Faisal Alqahtani, Robert Young, Rakesh Kumar

Research output: Contribution to journalArticlepeer-review


Freestanding (suspended) graphene films, with high electron mobility (up to ~200,000 cm2V−1s−1), good mechanical and electronic properties, could resolve many of the current issues that are hampering the upscaling of graphene technology. Thus far, attempts at reliably fabricating suspended graphene devices comprising metal contacts, have often been hampered by difficulties in exceeding sizes of 1 µm in diameter, if using UV lithography. In this work, area of suspended graphene large enough to be utilized in microelectronic devices, have been obtained by suspending a CVD graphene film over cavities, with top contacts defined through UV lithography with both wet and dry etching. An area of up to 160 µm2 can be fabricated as backgated devices. The suspended areas exhibit rippling of the surfaces which simultaneously introduces both tensile and compressive strain on the graphene film. Finally, the variations of the Fermi level in the suspended graphene areas can be modulated by applying a potential difference between the top contacts and the backgate. Having achieved large area suspended graphene, in a manner compatible with CMOS fabrication processes, together with enabling the modulation of the Fermi level, are substantial steps forward in demonstrating the potential of suspended graphene-based electronic devices and sensors.
Original languageEnglish
Pages (from-to)568-579
Number of pages12
JournalScience and Technology of Advanced Materials
Issue number1
Early online date3 Jun 2019
Publication statusPublished - 2019


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