Get access

Effect of trichlorobenzene additive on the performance and morphology of polyfluorene and fullerene derivative bulk heterojunction solar cells

Authors

  • W. Koetniyom,

    1. College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand
    2. ThEP Center, CHE, 328 Si Ayutthaya Rd., Bangkok 10400, Thailand
    3. Faculty of Industrial Physics and Medical Instrumentation, King Mongkut's University of Technology North Bangkok, 1518 Piboonsongkram Rd., Bangsae, Bangkok 10800, Thailand
    Search for more papers by this author
  • A. Keawprajak,

    1. National Nanotechnology Center, NSTDA, 130 Thailand Science Park, Phahonyothin Rd., Klong 1 Klong Luang, Pathumthani 12120, Thailand
    Search for more papers by this author
  • P. Piyakulawat,

    1. National Nanotechnology Center, NSTDA, 130 Thailand Science Park, Phahonyothin Rd., Klong 1 Klong Luang, Pathumthani 12120, Thailand
    Search for more papers by this author
  • K. Jiramitmongkon,

    1. National Nanotechnology Center, NSTDA, 130 Thailand Science Park, Phahonyothin Rd., Klong 1 Klong Luang, Pathumthani 12120, Thailand
    Search for more papers by this author
  • J. Nukeaw,

    1. College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand
    2. ThEP Center, CHE, 328 Si Ayutthaya Rd., Bangkok 10400, Thailand
    Search for more papers by this author
  • S. Pratontep,

    1. College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand
    2. ThEP Center, CHE, 328 Si Ayutthaya Rd., Bangkok 10400, Thailand
    Search for more papers by this author
  • U. Asawapirom

    Corresponding author
    1. National Nanotechnology Center, NSTDA, 130 Thailand Science Park, Phahonyothin Rd., Klong 1 Klong Luang, Pathumthani 12120, Thailand
    • National Nanotechnology Center, NSTDA, 130 Thailand Science Park, Phahonyothin Rd., Klong 1 Klong Luang, Pathumthani 12120, Thailand.
    Search for more papers by this author

Abstract

The influence of additive, namely 1,3,5-trichlorobenzene (TCB), on the morphology and performance of bulk heterojunction (BHJ) organic solar cells was studied based on a 1:2 (w/w) blend of benzothiadiazole/thiophene-based copolymers (PFTBzTT) to [6,6]-phenyl-C61 butyric acid methyl ester (PCBM). The active layers were deposited by spin-coating from solutions using chloroform, with different additive concentrations from 0 to 36 mg/ml. The addition of solvent additive into the polymer solution was able to improve the performance of BHJ solar cells. The maximum power conversion efficiency (%PCE) of 0.85% was obtained for a cell with the TCB concentration of 12 mg/ml after annealing at 180°C for 20 min. From atomic force microscopy (AFM) images, the films processed without TCB appear smoother than those with the TCB additive. A large extent of segregation was also observed in the films processed with a high TCB concentration. The optical images of the thin films suggest that the optimum concentrations of the additive cause the polymer self-organisation, resulting in some aggregation of large PCBM crystals. © 2011 Canadian Society for Chemical Engineering

Get access to the full text of this article

Ancillary