Home > Articles > Published articles > Improved metal-graphene contacts for low-noise, high-density microtransistor arrays for neural sensing |
Date: | 2020 |
Abstract: | Poor metal contact interfaces are one of the main limitations preventing unhampered access to the full potential of two-dimensional materials in electronics. Here we present graphene solution-gated field-effect-transistors (gSGFETs) with strongly improved linearity, homogeneity and sensitivity for small sensor sizes, resulting from ultraviolet ozone (UVO) contact treatment. The contribution of channel and contact region to the total device conductivity and flicker noise is explored experimentally and explained with a theoretical model. Finally, in-vitro recordings of flexible microelectrocorticography (μ-ECoG) probes were performed to validate the superior sensitivity of the UVO-treated gSGFET to brain-like activity. These results connote an important step towards the fabrication of high-density gSGFET μ-ECoG arrays with state-of-the-art sensitivity and homogeneity, thus demonstrating the potential of this technology as a versatile platform for the new generation of neural interfaces. |
Grants: | European Commission 785219 European Commission 732032 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1426 Ministerio de Ciencia e Innovación FIS2017-85787-R Ministerio de Ciencia e Innovación RTI2018-097876-B-C21 Ministerio de Ciencia e Innovación SEV-2017-0706 Ministerio de Economía y Competitividad JC-2015-25201 |
Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. |
Language: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Subject: | Contact treatment ; Graphene contacts ; Metal-contact interfaces ; Neural interfaces ; State of the art ; Theoretical modeling ; Two-dimensional materials ; Ultraviolet-ozone |
Published in: | Carbon, Vol. 161 (May 2020) , p. 647-655, ISSN 0008-6223 |
Preprint 18 p, 1.0 MB |