title: Graphene/Si-quantum-dot heterojunction diodes showing high photosensitivity compatible with quantum confinement effect.
abstract: Graphene/Si quantum dot (QD) heterojunction diodes are reported for the first time. The photoresponse, very sensitive to variations in the size of the QDs as well as in the doping concentration of graphene and consistent with the quantum-confinement effect, is remarkably enhanced in the near-ultraviolet range compared to commercially available bulk-Si photodetectors. The photoresponse proves to be dominated by the carriertunneling mechanism.
authors.affiliation: Department of Applied Physics and Institute of Natural Sciences, Kyung Hee University, Yongin, 446-701, Korea.
authors.forename: Dong Hee
authors.initials: DH
authors.lastname: Shin
authors.forename: Sung
authors.initials: S
authors.lastname: Kim
authors.forename: Jong Min
authors.initials: JM
authors.lastname: Kim
authors.forename: Chan Wook
authors.initials: CW
authors.lastname: Jang
authors.forename: Ju Hwan
authors.initials: JH
authors.lastname: Kim
authors.forename: Kyeong Won
authors.initials: KW
authors.lastname: Lee
authors.forename: Jungkil
authors.initials: J
authors.lastname: Kim
authors.forename: Si Duck
authors.initials: SD
authors.lastname: Oh
authors.forename: Dae Hun
authors.initials: DH
authors.lastname: Lee
authors.forename: Soo Seok
authors.initials: SS
authors.lastname: Kang
authors.forename: Chang Oh
authors.initials: CO
authors.lastname: Kim
authors.forename: Suk-Ho
authors.initials: SH
authors.lastname: Choi
authors.forename: Kyung Joong
authors.initials: KJ
authors.lastname: Kim
mesh_terms: D055615:Electrical Equipment and Supplies; D004583:Electrons; D006108:Graphite / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D007834:Lasers; D046529:Microscopy, Electron, Transmission; D053770:Nanowires / Q000737:chemistry*; D055668:Photochemical Processes; D017785:Photons; D045663:Quantum Dots / Q000737:chemistry*; D011789:Quantum Theory; D012825:Silicon / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D012822:Silicon Dioxide; D006108:Graphite; D012825:Silicon
keywords: Si quantum dots; graphene; heterojunction diodes; photodetectors; quantum confinement effect