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Investigation of transfer characteristics of high performance graphene flakes.
J Nanosci Nanotechnol. 2013 May; 13(5):3515-8.JN

Abstract

In this article, we attempted a study on field effect transport characteristics of graphene flakes. These graphene flakes were exfoliated by mechanical peeling-off technique and the electrical contacts were patterned by photo-lithographic method. Graphene devices have shown better transfer characteristics which was obtained even in low-voltage (< 5 V). Back-gated graphene transistors were patterned on oxidized silicon wafers. A clear n-type to p-type transition at Dirac point and higher electron drain-current modulation in positive back-gate field with current minimum (the Dirac point) were observed at V(GS) = -1.7 V. The carrier mobility was determined from the measured transconductance. The transconductance of the graphene transistors was observed as high as 18.6 microS with a channel length of 68 microm. A maximum electron mobility of 1870 +/- 143 cm2/V x s and hole mobility of 1050 +/- 35 cm2/V x s were achieved at a drain bias 2.1 V which are comparatively higher values among reported for mechanically exfoliated graphene using lithographic method. The fabricated devices also sustained with high-current density for 40 hr in continuous operation without any change in device resistance, which could be applied for robust wiring applications.

Authors+Show Affiliations

Department of Nanoscience and Technology, Karunya University, Coimbatore 641114, Tamil Nadu, India.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23858891

Citation

Venugopal, Gunasekaran, et al. "Investigation of Transfer Characteristics of High Performance Graphene Flakes." Journal of Nanoscience and Nanotechnology, vol. 13, no. 5, 2013, pp. 3515-8.
Venugopal G, Krishnamoorthy K, Kim SJ. Investigation of transfer characteristics of high performance graphene flakes. J Nanosci Nanotechnol. 2013;13(5):3515-8.
Venugopal, G., Krishnamoorthy, K., & Kim, S. J. (2013). Investigation of transfer characteristics of high performance graphene flakes. Journal of Nanoscience and Nanotechnology, 13(5), 3515-8.
Venugopal G, Krishnamoorthy K, Kim SJ. Investigation of Transfer Characteristics of High Performance Graphene Flakes. J Nanosci Nanotechnol. 2013;13(5):3515-8. PubMed PMID: 23858891.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Investigation of transfer characteristics of high performance graphene flakes. AU - Venugopal,Gunasekaran, AU - Krishnamoorthy,Karthikeyan, AU - Kim,Sang-Jae, PY - 2013/7/18/entrez PY - 2013/7/19/pubmed PY - 2013/8/2/medline SP - 3515 EP - 8 JF - Journal of nanoscience and nanotechnology JO - J Nanosci Nanotechnol VL - 13 IS - 5 N2 - In this article, we attempted a study on field effect transport characteristics of graphene flakes. These graphene flakes were exfoliated by mechanical peeling-off technique and the electrical contacts were patterned by photo-lithographic method. Graphene devices have shown better transfer characteristics which was obtained even in low-voltage (< 5 V). Back-gated graphene transistors were patterned on oxidized silicon wafers. A clear n-type to p-type transition at Dirac point and higher electron drain-current modulation in positive back-gate field with current minimum (the Dirac point) were observed at V(GS) = -1.7 V. The carrier mobility was determined from the measured transconductance. The transconductance of the graphene transistors was observed as high as 18.6 microS with a channel length of 68 microm. A maximum electron mobility of 1870 +/- 143 cm2/V x s and hole mobility of 1050 +/- 35 cm2/V x s were achieved at a drain bias 2.1 V which are comparatively higher values among reported for mechanically exfoliated graphene using lithographic method. The fabricated devices also sustained with high-current density for 40 hr in continuous operation without any change in device resistance, which could be applied for robust wiring applications. SN - 1533-4880 UR - https://www.unboundmedicine.com/medline/citation/23858891/Investigation_of_transfer_characteristics_of_high_performance_graphene_flakes_ DB - PRIME DP - Unbound Medicine ER -