title: Efficiency enhancements in solid-state hybrid solar cells via reduced charge recombination and increased light capture.
abstract: We compare a series of molecular sensitizers in dye-sensitized solar cells containing the organic hole transporter 2,2',7,7'-tetrakis(N,N-di-p-methoxypheny-amine)-9,9'-spirobifluorene (spiro-MeOTAD). Charge recombination is reduced by the presence of "ion-coordinating" moieties on the dye, with the longest electron lifetime and highest solar cell efficiency achieved using a novel sensitizer with diblock alkoxy-alkane pendent groups. By further increasing the optical path length in the active layer, we achieve a power conversion efficiency of over 5% under simulated sun light.
authors.affiliation: Institut de Chimie Physique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. h.snaith1@physics.ox.ac.uk
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Snaith
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Moule
authors.forename: Cédric
authors.initials: C
authors.lastname: Klein
authors.forename: Klaus
authors.initials: K
authors.lastname: Meerholz
authors.forename: Richard H
authors.initials: RH
authors.lastname: Friend
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel