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High efficiency organic photovoltaic cells based on a vapor deposited squaraine donor

Appl. Phys. Lett. 94, 233304 (2009); doi:10.1063/1.3152011

Published 9 June 2009

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Siyi Wang,1 Elizabeth I. Mayo,2 M. Dolores Perez,1 Laurent Griffe,1 Guodan Wei,3 Peter I. Djurovich,1 Stephen R. Forrest,3 and Mark E. Thompson1
1Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
2Global Photonic Energy Corp., 20 Trading Post Way, Medford Lake, New Jersey 08055, USA
3Departments of Electrical Engineering and Computer Science, Physics, and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ) is used as a donor material in vapor deposited organic heterojunction photovoltaic cells. Devices with the structure indium tin oxide/SQ (x)/C60 (400  Å)/bathocuproine (100  Å)/Al (1000  Å), where x=65, 110, 150, and 200  Å were compared. Devices with x=65  Å exhibited a power conversion efficiency of 3.1% under 1  sun, AM1.5G simulated solar irradiation, giving an open circuit voltage of 0.76±0.01  V, a short circuit current of 7.01±0.05  mA/cm2, and a fill factor of 0.56±0.05. Thicker SQ films lead to lower short circuit currents and fill factors, giving conversion efficiencies in the range of 2.6% to 3.2%. The demonstration of sublimable SQ as a donor material opens up a family of compounds for use in small molecule based heterojunction photovoltaics. ©2009 American Institute of Physics
History: Received 21 April 2009; accepted 15 May 2009; published 9 June 2009
Permalink: http://link.aip.org/link/?APPLAB/94/233304/1

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KEYWORDS and PACS

Keywords
PACS
  • 84.60.Jt
    Photoelectric conversion: solar cells and arrays
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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AIP is a member of CrossRef AIP

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