Skip to main content
placeholder image

Highly efficient photocathodes for dye-sensitized tandem solar cells

Journal Article


Abstract


  • Thin-film dye-sensitized solar cells (DSCs) based on

    mesoporous semiconductor electrodes are low-cost alternatives

    to conventional silicon devices1,2. High-efficiency

    DSCs typically operate as photoanodes (n-DSCs), where

    photocurrents result from dye-sensitized electron injection

    into n-type semiconductors. Dye-sensitized photocathodes

    (p-DSCs) operate in an inverse mode, where dye-excitation

    is followed by rapid electron transfer from a p-type semiconductor

    to the dye (dye-sensitized hole injection). Such

    p-DSCs and n-DSCs can be combined to construct tandem solar

    cells3 (pn-DSCs) with a theoretical efficiency limitation well

    beyond that of single-junction DSCs (ref. 4). Nevertheless,

    the efficiencies of such tandem pn-DSCs have so far been

    hampered by the poor performance of the available p-DSCs

    (refs 3, 5–15). Here we show for the first time that p-DSCs

    can convert absorbed photons to electrons with yields of up

    to 96%, resulting in a sevenfold increase in energy conversion

    efficiency compared with previously reported photocathodes7.

    The donor–acceptor dyes, studied as photocathodic sensitizers,

    comprise a variable-length oligothiophene bridge, which

    provides control over the spatial separation of the photogenerated

    charge carriers. As a result, charge recombination

    is decelerated by several orders of magnitude and tandem

    pn-DSCs can be constructed that exceed the efficiency of their

    individual components.

Authors


  •   Nattestad, Andrew
  •   Mozer, Attila J.
  •   Fischer, M K.R.. (external author)
  •   Cheng, Yi-Bing (external author)
  •   Mishra, Amaresh (external author)
  •   Bäuerle, Peter (external author)
  •   Bach, Udo (external author)

Publication Date


  • 2010

Citation


  • Nattestad, A., Mozer, A. J., Fischer, M. K.R.., Cheng, Y., Mishra, A., Bäuerle, P. & Bach, U. (2010). Highly efficient photocathodes for dye-sensitized tandem solar cells. Nature Materials, 9 (1), 31-35.

Scopus Eid


  • 2-s2.0-72449125581

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5325

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 31

End Page


  • 35

Volume


  • 9

Issue


  • 1

Abstract


  • Thin-film dye-sensitized solar cells (DSCs) based on

    mesoporous semiconductor electrodes are low-cost alternatives

    to conventional silicon devices1,2. High-efficiency

    DSCs typically operate as photoanodes (n-DSCs), where

    photocurrents result from dye-sensitized electron injection

    into n-type semiconductors. Dye-sensitized photocathodes

    (p-DSCs) operate in an inverse mode, where dye-excitation

    is followed by rapid electron transfer from a p-type semiconductor

    to the dye (dye-sensitized hole injection). Such

    p-DSCs and n-DSCs can be combined to construct tandem solar

    cells3 (pn-DSCs) with a theoretical efficiency limitation well

    beyond that of single-junction DSCs (ref. 4). Nevertheless,

    the efficiencies of such tandem pn-DSCs have so far been

    hampered by the poor performance of the available p-DSCs

    (refs 3, 5–15). Here we show for the first time that p-DSCs

    can convert absorbed photons to electrons with yields of up

    to 96%, resulting in a sevenfold increase in energy conversion

    efficiency compared with previously reported photocathodes7.

    The donor–acceptor dyes, studied as photocathodic sensitizers,

    comprise a variable-length oligothiophene bridge, which

    provides control over the spatial separation of the photogenerated

    charge carriers. As a result, charge recombination

    is decelerated by several orders of magnitude and tandem

    pn-DSCs can be constructed that exceed the efficiency of their

    individual components.

Authors


  •   Nattestad, Andrew
  •   Mozer, Attila J.
  •   Fischer, M K.R.. (external author)
  •   Cheng, Yi-Bing (external author)
  •   Mishra, Amaresh (external author)
  •   Bäuerle, Peter (external author)
  •   Bach, Udo (external author)

Publication Date


  • 2010

Citation


  • Nattestad, A., Mozer, A. J., Fischer, M. K.R.., Cheng, Y., Mishra, A., Bäuerle, P. & Bach, U. (2010). Highly efficient photocathodes for dye-sensitized tandem solar cells. Nature Materials, 9 (1), 31-35.

Scopus Eid


  • 2-s2.0-72449125581

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5325

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 31

End Page


  • 35

Volume


  • 9

Issue


  • 1