Hybrid structures of organic dye and graphene for ultrahigh gain photodetectors. (July 2015)

• Record Type: Journal Article
• Authors: Lee, Youngbin; Yu, Seong Hun; Jeon, Jiwon; Kim, Hyunmin; Lee, Jun Young; Kim, Hyungjun; Ahn, Jong-Hyun; Hwang, Euyheon; Cho, Jeong Ho
• Is Part Of: Carbon. Volume 88(2015)
• Page Start: 165
• Page End: 172
• Publication Date: 2015-07
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2015.02.071
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: A hybrid structure comprising organic dye molecules (e.g., rhodamine 6G) and graphene was developed for the realization of high-performance optoelectronic devices. The fabricated photodetector offered a broad spectral photo-response across wavelengths in the infrared, visible, and ultraviolet regions, as well as a high responsivity (∼460 A/W at illumination power of 1 μW). The photocurrent generated in the hybrid photodetector (∼mA) was much higher than that generated in a pristine graphene photodetector (<μA). The performance of the dye-sensitized photodetector relied on enhanced photoabsorption and the implementation of a photocurrent gain arising from the photo-excited charges.