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Title: Fullerene C{sub 70} as a p-type donor in organic photovoltaic cells

Fullerenes and their derivatives have been widely used as n-type materials in organic transistor and photovoltaic devices. Though it is believed that they shall be ambipolar in nature, there have been few direct experimental proofs for that. In this work, fullerene C{sub 70}, known as an efficient acceptor, has been employed as a p-type electron donor in conjunction with 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile as an electron acceptor in planar-heterojunction (PHJ) organic photovoltaic (OPV) cells. High fill factors (FFs) of more than 0.70 were reliably achieved with the C{sub 70} layer even up to 100 nm thick in PHJ cells, suggesting the superior potential of fullerene C{sub 70} as the p-type donor in comparison to other conventional donor materials. The optimal efficiency of these unconventional PHJ cells was 2.83% with a short-circuit current of 5.33 mA/cm{sup 2}, an open circuit voltage of 0.72 V, and a FF of 0.74. The results in this work unveil the potential of fullerene materials as donors in OPV devices, and provide alternative approaches towards future OPV applications.
Authors:
; ; ;  [1] ;  [1] ;  [2] ; ;  [3]
  1. Department of Organic Device Engineering, Graduate School of Science and 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:
22311038
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; 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; BINDING ENERGY; CURRENTS; ELECTRIC POTENTIAL; ELECTRICAL FAULTS; ELECTRONS; EQUIPMENT; FILL FACTORS; FULLERENES; HETEROJUNCTIONS; LAYERS; PHOTOVOLTAIC CELLS; PHOTOVOLTAIC EFFECT; TRANSISTORS