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Electrical characterization of single-walled carbon nanotubes in organic solar cells by Kelvin probe force microscopy

Source: Appl. Phys. Lett. 96, 083302 (2010); doi:10.1063/1.3332489

Published 23 February 2010

KEYWORDS and PACS
Keywords
PACS
  • 88.40.jr
    Organic photovoltaics
  • 88.40.hj
    Efficiency and performance of solar cells
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9644 (online)
Publisher:
AIP is a member of CrossRef AIP
Liming Liu and Guangyong Li
Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
The electrical role (donor or acceptor) of single-walled carbon nanotubes (SWCNTs) in organic solar cells remains controversial in the literature. Using Kelvin probe force microscopy (KPFM) to investigate SWCNTs on regioregular poly 3-hexylthiophene (P3HT) film as well as on P3HT and methanofullerene blended film, we have observed that photoinduced holes transport from active layer to SWCNTs, which indicates that SWCNTs work as donor materials. Moreover, KPFM study of SWCNTs on P3HT film reveals that the relatively low power conversion efficiency of P3HT/SWCNTs solar cells is attributed to deficient photoexcited carrier transport between P3HT and SWCNTs because of inefficient exciton dissociation. ©2010 American Institute of Physics
History: Received 15 January 2010; accepted 4 February 2010; published 23 February 2010
Permalink: http://link.aip.org/link/?APPLAB/96/083302/1

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