title: Solution-processable singlet fission photovoltaic devices.
abstract: We demonstrate the successful incorporation of a solution-processable singlet fission material, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), into photovoltaic devices. TIPS-pentacene rapidly converts high-energy singlet excitons into pairs of triplet excitons via singlet fission, potentially doubling the photocurrent from high-energy photons. Low-energy photons are captured by small-bandgap electron-accepting lead chalcogenide nanocrystals. This is the first solution-processable singlet fission system that performs with substantial efficiency with maximum power conversion efficiencies exceeding 4.8%, and external quantum efficiencies of up to 60% in the TIPS-pentacene absorption range. With PbSe nanocrystal of suitable bandgap, its internal quantum efficiency reaches 170 ± 30%.
authors.affiliation: Cavendish Laboratory , J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: Le
authors.initials: L
authors.lastname: Yang
authors.forename: Maxim
authors.initials: M
authors.lastname: Tabachnyk
authors.forename: Sam L
authors.initials: SL
authors.lastname: Bayliss
authors.forename: Marcus L
authors.initials: ML
authors.lastname: Böhm
authors.forename: Katharina
authors.initials: K
authors.lastname: Broch
authors.forename: Neil C
authors.initials: NC
authors.lastname: Greenham
authors.forename: Richard H
authors.initials: RH
authors.lastname: Friend
authors.forename: Bruno
authors.initials: B
authors.lastname: Ehrler
mesh_terms: D053758:Nanoparticles / Q000737:chemistry*; D017646:Organosilicon Compounds / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D017646:Organosilicon Compounds; C522282:bis(triisopropylsilylethynyl)pentacene
keywords: Singlet fission; TIPS-pentacene; colloidal nanocrystals; hybrid photovoltaics; multiple carrier generation; quantum dots