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Effects of semiconducting and metallic single-walled carbon nanotubes on performance of bulk heterojunction organic solar cells

Appl. Phys. Lett. 94, 233309 (2009); doi:10.1063/1.3153514

Published 11 June 2009

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Liming Liu, William E. Stanchina, and Guangyong Li
Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
This letter reports that the performance of organic solar cells made from blended films of regioregular poly 3-hexylthiophene and methanofullerene can be boosted by introducing single-walled carbon nanotubes (SWCNTs) into the active layer at low concentration. However, the performance degrades at higher SWCNTs concentration. The intensity dependent photocurrent measurement shows that the decreased performance at higher concentration of SWCNTs is attributed to bimolecular recombination in the presence of metallic SWCNTs. Meanwhile, it has been found that the increased performance at low concentration of SWCNTs is due to the increased carrier mobility as semiconducting SWCNTs provide lower resistance pathways. ©2009 American Institute of Physics
History: Received 16 February 2009; accepted 21 May 2009; published 11 June 2009
Permalink: http://link.aip.org/link/?APPLAB/94/233309/1

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KEYWORDS and PACS

Keywords
PACS
  • 84.60.Jt
    Photoelectric conversion: solar cells and arrays
  • 72.40.+w
    Photoconduction and photovoltaic effects
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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