Enhancement of the Electrical Properties of CVD-Grown Graphene with Ascorbic Acid Treatment

• Published in: Journal of electronic materials Vol. 45; no. 2; pp. 1160 - 1164
• Main Authors: Tang, Chunmiao, Chen, Zhiying, Zhang, Haoran, Zhang, Yaqian, Zhang, Yanhui, Sui, Yanping, Yu, Guanghui, Cao, Yijiang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2016; Springer Nature B.V
• Subjects: Acids; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Electric properties; Electronics; Electronics and Microelectronics; Instrumentation; Materials Science; Optical and Electronic Materials; Solid State Physics; CVD; OH; ascorbic acid; mobility; transfer; Graphene
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-015-4229-z

Ascorbic acid was used to modify to chemical vapor deposition (CVD)-grown graphene films transferred onto SiO 2 substrate. Residual polymer (polymethyl methacrylate), Fe 3+ , Cl − , H 2 O, and O 2 affected the electrical and thermal properties on graphene during the transfer or device fabrication processes. Exposure of transferred graphene to ascorbic acid resulted in significantly enhanced electrical properties with increased charge carrier mobility. All devices exhibited more than 30% improvement in room temperature carrier mobility in air. The carrier mobility of the treated graphene did not significantly decrease in 21 days. This result can be attributed to electron donation to graphene through the −OH functional group in ascorbic acid that is absorbed in graphene. This work provides a method to enhance the electrical properties of CVD-grown graphene.