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Title: Accurate spectral response measurements of a complementary absorbing organic tandem cell with fill factor exceeding the subcells

Single heterojunction organic photovoltaic cells based on co-evaporated donor–acceptor layers with power conversion efficiencies (η) above 5.5% are demonstrated, using either high (1.8 eV) or low (1.4 eV) optical gap materials. The high energy absorbing cell utilizes a high fullerene-C{sub 70} content, in combination with a high mobility amorphous donor, while the low energy absorbing cell consists of a donor–acceptor molecule paired with C{sub 60} as the acceptor. The integration of the two cells in an optimized tandem configuration leads to η =7.2%, verified by external quantum efficiency measurements of the subcells. Notably, the fill-factor of the tandem stack is higher than either one of the sub-cells.
Authors:
 [1] ;  [1] ;  [2] ; ;  [1] ;  [2]
  1. Organic Photovoltaics, imec, Kapeldreef 75, 3001 Leuven-Heverlee (Belgium)
  2. (United States)
Publication Date:
OSTI Identifier:
22283095
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 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; AMORPHOUS STATE; CARRIER MOBILITY; ENERGY CONVERSION; ENERGY GAP; FILL FACTORS; FULLERENES; HETEROJUNCTIONS; LAYERS; ORGANIC COMPOUNDS; PHOTOVOLTAIC CELLS; QUANTUM EFFICIENCY; SPECTRAL RESPONSE