title: Self-organization of nanocrystals in polymer brushes. Application in heterojunction photovoltaic diodes.
abstract: We present a new approach to achieving order in molecular semiconductors via alignment of polymer chains using surface-initiated polymerization. Polyacrylate brushes grown from transparent conducting electrodes, with triarylamine side groups as hole-transporting components, show characteristics of high mobilities for hole transport. Solution processing a second component with favorable enthalpic interactions can form a composite with mesoscale order and be exploited for heterojunction diodes. We find substantial uptake of CdSe nanocrystals (with diameter in the range 2.5-2.8 nm), and such composites show photovoltaic quantum efficiencies of up to 50%.
authors.affiliation: Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, UK.
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Snaith
authors.forename: Gregory L
authors.initials: GL
authors.lastname: Whiting
authors.forename: Baoquan
authors.initials: B
authors.lastname: Sun
authors.forename: Neil C
authors.initials: NC
authors.lastname: Greenham
authors.forename: Wilhelm T S
authors.initials: WT
authors.lastname: Huck
authors.forename: Richard H
authors.initials: RH
authors.lastname: Friend