title: TiO2 nanotubes with a ZnO thin energy barrier for improved current efficiency of CdSe quantum-dot-sensitized solar cells.
abstract: This paper reports the formation of a thin ZnO energy barrier between a CdSe quantum dot (Q dots) sensitizer and TiO2 nanotubes (TONTs) for improved current efficiency of Q dot-sensitized solar cells. The formation of a ZnO barrier between TONTs and the Q dot sensitizer increased the short-circuit current under illumination and also reduced the dark current in a dark environment. The power conversion efficiency of Q dot-sensitized TONT solar cells increased by 25.9% in the presence of the ZnO thin layer due to improved charge-collecting efficiency and reduced recombination.
authors.affiliation: Department of Chemistry, Hanyang University, Haengdang-dong 17, Sungdong-ku, Seoul 133-791, Korea.
authors.forename: Wonjoo
authors.initials: W
authors.lastname: Lee
authors.forename: Soon Hyung
authors.initials: SH
authors.lastname: Kang
authors.forename: Jae-Yup
authors.initials: JY
authors.lastname: Kim
authors.forename: Govind B
authors.initials: GB
authors.lastname: Kolekar
authors.forename: Yung-Eun
authors.initials: YE
authors.lastname: Sung
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Han