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Title: Fullerene derivatives as electron donor for organic photovoltaic cells

We demonstrated the performance of unconventional, all-fullerene-based, planar heterojunction (PHJ) organic photovoltaic (OPV) cells using fullerene derivatives indene-C{sub 60} bisadduct (ICBA) and phenyl C{sub 61}-butyric acid methyl ester as the electron donors with fullerene C{sub 70} as the electron acceptor. Two different charge generation processes, including charge generation in the fullerene bulk and exciton dissociation at the donor-acceptor interface, have been found to exist in such all-fullerene-based PHJ cells and the contribution to the total photocurrent from each process is strongly dependent on the thickness of fullerene donor. The optimized 5 nm ICBA/40 nm C{sub 70} PHJ cell gives clear external quantum efficiency responses for the long-wavelength photons corresponding to the dissociation of strongly bound Frenkel excitons, which is hardly observed in fullerene-based single layer reference devices. This approach using fullerene as a donor material provides further possibilities for developing high performance OPV cells.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Department of Organic Device Engineering, Graduate School of Engineering, and Research Center for Organic Electronics (ROEL), Yamagata University, Yonezawa 992-8510 (Japan)
  2. (United States)
  3. Department of Materials Science and Engineering, University of California, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
22254098
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 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; BINDING ENERGY; BUTYRIC ACID; ELECTRONS; FULLERENES; HETEROJUNCTIONS; INDENE; PHOTOVOLTAIC CELLS; PHOTOVOLTAIC EFFECT; QUANTUM EFFICIENCY; VALENCE; WAVELENGTHS