title: Air-stable and efficient inorganic-organic heterojunction solar cells using PbS colloidal quantum dots co-capped by 1-dodecanethiol and oleic acid.
abstract: PbS colloidal quantum dot (CQD)-sensitized inorganic-organic heterojunction solar cells fabricated by using the PbS CQDs co-capped by the oleic acid (OA) and 1-dodecanethiol (DT) ligand showed better device stability with aging time under ambient conditions without encapsulation. Furthermore, the device performance is better than the cell fabricated from PbS CQDs without DT ligand. The enhancement of performance in OA and DT co-capped systems is investigated by impedance spectroscopy. An upward displacement of the TiO(2) conduction band, with a consequent increase of V(oc), results in the improved performance when CQD with DT are employed.
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Korea.
authors.forename: Sungwoo
authors.initials: S
authors.lastname: Kim
authors.forename: Sang Hyuk
authors.initials: SH
authors.lastname: Im
authors.forename: Meejae
authors.initials: M
authors.lastname: Kang
authors.forename: Jin Hyuck
authors.initials: JH
authors.lastname: Heo
authors.forename: Sang Il
authors.initials: SI
authors.lastname: Seok
authors.forename: Sang-Wook
authors.initials: SW
authors.lastname: Kim
authors.forename: Iván
authors.initials: I
authors.lastname: Mora-Seró
authors.forename: Juan
authors.initials: J
authors.lastname: Bisquert