title: Charge transfer state versus hot exciton dissociation in polymer-fullerene blended solar cells.
abstract: We examine the significance of hot exciton dissociation in two archetypical polymer-fullerene blend solar cells. Rather than evolving through a bound charge transfer state, hot processes are proposed to convert excitons directly into free charges. But we find that the internal quantum yields of carrier photogeneration are similar for both excitons and direct excitation of charge transfer states. The internal quantum yield, together with the temperature dependence of the current-voltage characteristics, is consistent with negligible impact from hot exciton dissociation.
authors.affiliation: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Jiye
authors.initials: J
authors.lastname: Lee
authors.forename: Koen
authors.initials: K
authors.lastname: Vandewal
authors.forename: Shane R
authors.initials: SR
authors.lastname: Yost
authors.forename: Matthias E
authors.initials: ME
authors.lastname: Bahlke
authors.forename: Ludwig
authors.initials: L
authors.lastname: Goris
authors.forename: Marc A
authors.initials: MA
authors.lastname: Baldo
authors.forename: Jean V
authors.initials: JV
authors.lastname: Manca
authors.forename: Troy
authors.initials: T
authors.lastname: Van Voorhis
mesh_terms: D011211:Electric Power Supplies; D037741:Fullerenes / Q000737:chemistry*; D008958:Models, Molecular; D011108:Polymers / Q000737:chemistry*; D011789:Quantum Theory; D013696:Temperature
chemical_list: D037741:Fullerenes; D011108:Polymers