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Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S2 — Mar. 11, 2013
  • pp: A241–A249

Subnanosecond charge photogeneration and recombination in polyfluorene copolymer-fullerene solar cell: Effects of electric field

Wei Zhang, Ye Huang, Ya-Dong Xing, Yan Jing, Long Ye, Li-Min Fu, Xi-Cheng Ai, Jian-Hui Hou, and Jian-Ping Zhang  »View Author Affiliations

Optics Express, Vol. 21, Issue S2, pp. A241-A249 (2013)

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Influence of electric field on the subnanosecond charge photogeneration dynamics in the polymer solar cell based on polyfluorene copolymer BisDMO-PFDTBT blended with PC61BM was examined with transient absorption spectroscopy. The charge dynamics showed no difference under short- or open-circuit conditions and under a forward bias of 0.79 V (1.6 × 105 V/cm), implying negligible field effects on the subnanosecond dynamics of charge photogeneration/recombination. However, under the reverse biases of −2 V (4.0 × 105 V/cm) and −5 V (1.0 × 106 V/cm), significant enhancement of charge photogeneration and apparent suppression of polaron pair recombination were observed, which agrees with the field-assisted enhancement of external quantum efficiency of the solar cell devices.

© 2013 OSA

OCIS Codes
(160.5470) Materials : Polymers
(250.2080) Optoelectronics : Polymer active devices
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:

Original Manuscript: November 12, 2012
Revised Manuscript: January 13, 2013
Manuscript Accepted: January 17, 2013
Published: February 4, 2013

Wei Zhang, Ye Huang, Ya-Dong Xing, Yan Jing, Long Ye, Li-Min Fu, Xi-Cheng Ai, Jian-Hui Hou, and Jian-Ping Zhang, "Subnanosecond charge photogeneration and recombination in polyfluorene copolymer-fullerene solar cell: Effects of electric field," Opt. Express 21, A241-A249 (2013)

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