TY - JOUR
T1 - Improved metal-graphene contacts for low-noise, high-density microtransistor arrays for neural sensing
AU - Mavredakis, Nikolaos
AU - Jiménez Jiménez, David
AU - Schaefer, Nathan
AU - Garcia Cortadella, Ramon
AU - Bonaccini Calia, Andrea
AU - Illa, Xavi
AU - Masvidal Codina, Eduard
AU - De la Cruz, Jose
AU - Del Corro, Elena
AU - Rodríguez Domínguez, Laura
AU - Prats Alfonso, Elisabet
AU - Bousquet, Jessica
AU - Martínez-Aguilar, Javier
AU - Villa, Rosa
AU - Guimerà Brunet, Anton
AU - Garrido, Jose
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - Contact treatment
KW - Graphene contacts
KW - Metal-contact interfaces
KW - Neural interfaces
KW - State of the art
KW - Theoretical modeling
KW - Two-dimensional materials
KW - Ultraviolet-ozone
U2 - 10.1016/j.carbon.2020.01.066
DO - 10.1016/j.carbon.2020.01.066
M3 - Article
SN - 0008-6223
VL - 161
SP - 647
EP - 655
JO - Carbon
JF - Carbon
ER -