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Title: Zinc oxide modified with benzylphosphonic acids as transparent electrodes in regular and inverted organic solar cell structures

An approach is presented to modify the work function of solution-processed sol-gel derived zinc oxide (ZnO) over an exceptionally wide range of more than 2.3 eV. This approach relies on the formation of dense and homogeneous self-assembled monolayers based on phosphonic acids with different dipole moments. This allows us to apply ZnO as charge selective bottom electrodes in either regular or inverted solar cell structures, using poly(3-hexylthiophene):phenyl-C71-butyric acid methyl ester as the active layer. These devices compete with or even surpass the performance of the reference on indium tin oxide/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate. Our findings highlight the potential of properly modified ZnO as electron or hole extracting electrodes in hybrid optoelectronic devices.
Authors:
; ; ; ; ;  [1] ; ; ;  [2]
  1. Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam (Germany)
  2. Department of Chemistry and IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin (Germany)
Publication Date:
OSTI Identifier:
22395773
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BUTYRIC ACID; DIPOLE MOMENTS; ELECTRODES; ELECTRONS; ESTERS; EV RANGE; HOLES; INDIUM COMPOUNDS; OPTOELECTRONIC DEVICES; ORGANIC SOLAR CELLS; PERFORMANCE; PHOSPHONIC ACIDS; POLYSTYRENE; SOL-GEL PROCESS; TIN OXIDES; WORK FUNCTIONS; ZINC OXIDES