Roll-to-Roll Dry Transfer of Large-scale Graphene
Since its discovery, graphene has been envisioned for a wide range of advanced applications, such as flexible displays, solar cells, sensors for wearable electronics, and gas separation membranes. A major challenge for graphene applications is the lack of mass production technology for high quality and large-scale graphene manufacturing. Large-scale graphene can be grown on metal substrates using chemical vapor deposition (CVD). After the growth, CVD graphene needs to be transferred to a target substrate, such as a polymer film, for device fabrication. Our work is focused on developing a roll-to-roll (R2R) dry transfer process for large-scale CVD graphene. The transfer process is fast, controllable, and environmentally benign. It avoids graphene contamination and allows the reuse of the graphene growth substrate. The R2R dry transfer process will be presented, along with results from fabricating graphene-based field-effect transistors (GFETs) using the dry-transferred graphene samples. We show that these flexible GFETs have a near-zero doping level and a gate leakage current one to two orders of magnitude lower than those fabricated using wet-chemically etched graphene samples.
Dr. Wei Li is a professor in the Walker Department of Mechanical Engineering at The University of Texas at Austin. He taught at the University of Washington from 2000 to 2009, before joining UT in 2010. Dr. Li received his Ph.D. degree from The University of Michigan. His bachelor’s degree was from Tsinghua University in Beijing, China. Dr. Li’s research interests include nano and biomaterials processing and manufacturing, biomedical design and manufacturing, and clean energy technology. He is a recipient of the 2005 Presidential Early Career Award for Scientists and Engineers (PECASE). Dr. Li has served as a Board Director of North American Manufacturing Research Institution (NAMRI) and an Associate Editor of ASME Journal of Manufacturing Science and Engineering. He was elected ASME Fellow in 2017.