title: Hybrid inorganic-organic tandem solar cells for broad absorption of the solar spectrum.
abstract: We report the first hybrid tandem solar cell with solution processable active layers using colloidal PbS quantum dots (QDs) as the front subcell in combination with a polymer-fullerene rear subcell. Al/WO3 is introduced as an interlayer, yielding an open circuit voltage (VOC) equal to about 92% of the sum of the VOC of the subcells. The device exhibits a power conversion efficiency of 1.8%. Optical simulations of various tandem configurations show that combining PbS QDs with small-bandgap polymers is a promising strategy to obtain tandem solar cells with a very broad absorption range and a high short circuit current.
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen, 9747 AG, The Netherlands. m.j.speirs@rug.nl m.a.loi@rug.nl.
authors.forename: M J
authors.initials: MJ
authors.lastname: Speirs
authors.forename: B G H M
authors.initials: BG
authors.lastname: Groeneveld
authors.forename: L
authors.initials: L
authors.lastname: Protesescu
authors.forename: C
authors.initials: C
authors.lastname: Piliego
authors.forename: M V
authors.initials: MV
authors.lastname: Kovalenko
authors.forename: M A
authors.initials: MA
authors.lastname: Loi