Electrical properties of back-gated <i>n</i>-layer graphene films

P. Joshi; A. Gupta; P. C. Eklund; S. A. Tadigadapa

doi:10.1117/12.707654

12 February 2007 Electrical properties of back-gated n-layer graphene films

P. Joshi, A. Gupta, P. C. Eklund, S. A. Tadigadapa

Proceedings Volume 6464, MEMS/MOEMS Components and Their Applications IV; 646409 (2007) https://doi.org/10.1117/12.707654
Event: MOEMS-MEMS 2007 Micro and Nanofabrication, 2007, San Jose, California, United States

Abstract

We present results of room temperature studies of the electrical characteristics of back-gated ultrathin graphite films prepared by mechanical transfer of thin sections of Highly Oriented Pyrolytic Graphite (HOPG) to a Si/SiO₂ substrate. The films studied were quite thin, exhibiting only a few graphene layers (n). Films with thickness in the range 1 < n < 20 were studied, where n has been deduced by Atomic Force Microscopy (AFM) z-scans. The n value deduced by AFM z-scan data was correlated with the n value deduced by Raman scattering data. We discuss at some length, the issue of whether or not Raman scattering can provide a standalone measure of n. Electrical contacts were made to a few of the low n (n = 1,2,3) graphene films. Most graphene films exhibited a nearly symmetric resistance (R) anomaly vs. gate voltage (V_G) in the range 25 < V_G < 110 V; some films exhibited as much as a factor of ~50 decrease in R (relative to the maximum R) with changing VG. An interesting low bias shoulder on the negative side of the resistance peak anomaly was also observed. The devices were fabricated with a lithography free process.

Citation Download Citation

P. Joshi, A. Gupta, P. C. Eklund, and S. A. Tadigadapa "Electrical properties of back-gated n-layer graphene films", Proc. SPIE 6464, MEMS/MOEMS Components and Their Applications IV, 646409 (12 February 2007); https://doi.org/10.1117/12.707654

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available