title: Enhanced photocurrent generation of binary self-assembled monolayers of di-(3-aminopropyl)-viologen and methylviologen on indium tin oxide.
abstract: The binary self-assembled monolayers (SAMs) of di-(3-aminopropyl)-viologen (DAPV) and methylviologen (MV) molecules on indium tin oxide (ITO) were prepared by dipping the DAPV SAMs/ITO substrates into MV solution. The DAPV-MV SAM films were characterized by UV-vis. absorption spectroscopy, Rutherford backscattering spectroscopy, and cyclic voltammetry. Optical band gap, lowest unoccupied molecular orbital, and highest occupied molecular orbital of DAPV-MV SAMs were measured to be 1.6, -4.3, and -5.9 eV, respectively. We found that although DAPV SAMs have a quantum yield of 0.11%, the binary SAM films have a good quantum yield of 2.30%, which was 20 times higher than that of DAPV SAMs on ITO. This result may be due to the higher adsorption property of the binary SAMs for the light in visible range compared to that of DAPV SAMs. From this study, we demonstrated that the photocurrent generation systems with a high quantum yield can be obtained by the functional binary SAMs.
authors.affiliation: Department of Chemistry, Hanyang University, 17 Haengdang-dong, Sungdong-ku, Seoul 133-791, Republic of Korea.
authors.forename: Misun
authors.initials: M
authors.lastname: Lee
authors.forename: Kyung-Hee
authors.initials: KH
authors.lastname: Hyung
authors.forename: Wonjoo
authors.initials: W
authors.lastname: Lee
authors.forename: Heejoon
authors.initials: H
authors.lastname: Ahn
authors.forename: Byung Won
authors.initials: BW
authors.lastname: Cho
authors.forename: Jaegeun
authors.initials: J
authors.lastname: Noh
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Han