Get access

Bandgap Modulation in Efficient n-Thiophene Absorbers for Dye Solar Cell Sensitization

Authors

  • Eva Mª Barea Dr.,

    1. Photovoltaic and Optoelectronic Devices Group, Physics Department, Universitat Jaume I, 12071 Castelló (Spain), Fax: (+34) 964 729218
    Search for more papers by this author
  • Rubén Caballero,

    1. Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Universidad de Castilla La Mancha, Campus de la Antigua Fábrica de Armas, Avda. Carlos III, s/n 45071. Toledo (Spain)
    Search for more papers by this author
  • Francisco Fabregat-Santiago Dr.,

    1. Photovoltaic and Optoelectronic Devices Group, Physics Department, Universitat Jaume I, 12071 Castelló (Spain), Fax: (+34) 964 729218
    Search for more papers by this author
  • Pilar De La Cruz Dr.,

    1. Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Universidad de Castilla La Mancha, Campus de la Antigua Fábrica de Armas, Avda. Carlos III, s/n 45071. Toledo (Spain)
    Search for more papers by this author
  • Fernando Langa Prof.,

    1. Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Universidad de Castilla La Mancha, Campus de la Antigua Fábrica de Armas, Avda. Carlos III, s/n 45071. Toledo (Spain)
    Search for more papers by this author
  • Juan Bisquert Prof.

    1. Photovoltaic and Optoelectronic Devices Group, Physics Department, Universitat Jaume I, 12071 Castelló (Spain), Fax: (+34) 964 729218
    Search for more papers by this author

Abstract

Five new sensitizers for dye sensitized solar cells have been designed consisting of conjugated thienylenevinylene units threaded with alkyl chains to improve solubility and cyanoacetic acid as anchoring group. The conjugation length was increased from 2 to 6 thienylenevinylene units, which resulted in a red-shift of the optical absorption of the dyes from 550 to 750 nm, improving the spectral overlap with the solar spectrum. The photovoltaic performance of these dyes as sensitizers in mesoporous TiO2 solar cells shows a clear correlation of increasing photocurrent with the extension of the conjugation up to an optimal length. Further extension of the conjugation increases the absorption but additional effects like self-quenching or recombination processes reduce the photocurrent and photovoltages and consequently the overall efficiency of the DSC.

Get access to the full text of this article

Ancillary