Epitaxial Graphene: a New Platform for Carbon Electronics

1. Epitaxial Graphene: a New Platform for Carbon Electronics A B A C-Face termination N02 3rd cone B I(k) (a.u.) SiC Si-Face termination n=0 4µm C-face STM of Graphene (a) Schematic graphene ribbon array and buss (grey) on a 4 x 6mm SiC Sample. (b) a blowup SEM image of the graphene ribbon array. (c) a SEM blowup of (b) showing 11nm graphene ribbons. n=1 High PT Furnace n=2 n=3 Hall bar structure For mobility and doping measurements Thermal potential measurement structure E=20-50 mV/K Si-Face Eg ~ 0.1eV EDC through the Dirac point for 20nm ribbons. Dashed line is data for after dividing by the Fermi-Dirac distribution at 300K. 10,000 FET array Source Gate Drain Chemical Functionalization 1mm graphene ribbon channel GT Lorraine CEA UM APS UCB CNRS NIST A A&M UCR MRSEC GT Mike @ SOLEIL INTRODUCTION The GT MRSEC consist of a single IRG whose goal is to develop epitaxial graphene as a new material for the post Si-CMOS age. Research focuses on the growth of graphene on SiC, characterizing both its structural and electronic properties and a vigorous push to develop device architectures and fabrication processing to bring graphene as quickly as possible to a commercial stage. Epitaxial graphene is the only commercially relevant production method. It is produced by Si sublimation from SiC, which leads to thin film graphene on insulating SiC. Graphene is a single sheet of graphite. Its electronic band structure near the Fermi Energy is unique. The linear bands mean that the electron effective mass is essentially zero! • Scalable to large circuit arrays • Extreme mobilities (>105cm2/V-sec) • Ambipolar doping by an applied field • High current capacity • Predicted THz switching speeds Education and Diversity Materials Development State of the Art Goal: To equip a diverse population of students with the technical and professional tools needed to lead the science and engineering communities of tomorrow in industry, academia, and the public. Graphene is grown in a high pressure furnace that leads to extremely well order films. The GT MRSEC has been developing techniques to fabricate new device architectures. An extensive network of both in house and external experts allow rapid analysis of transport and electronic properties through a wide variety of experimental techniques. Research Experience for Undergraduates Device architecture • 10 weeks of EG research • Each student has both a faculty advisor and a graduate social mentor • A weekly seminar on emerging research • Participant monthly stipend, lodging, meals, and a travel allowance • Visits to local industrial sites • Social and cultural activities Thickness Map Chip Size: 3.5mm×4.5mm Average Thickness: 8.08 Å Standard Deviation: 0.46Å Quantum Hall Effect in graphene ribbons For Room Temperature resistance standards C-face graphene is a new allotrope of carbon. Rotational stacking order makes nearly all sheets in the stack behave electronically like an isolated graphene sheet. Served 18,660 pages to 2,484 unique visitors in one month. National & International Research Experience • Travel Grants • Collaborative Research • Access to Unique Equipment • International Research Experience for Students Band structure of multilayer graphene Multilayer graphene graphite