From flat to nanostructured photovoltaics: Balance between thickness of the absorber and charge screening in sensitized solar cells

Pablo P. Boix, Yong Hui Lee, Francisco Fabregat-Santiago, Sang Hyuk Im, Ivan Mora-Sero, Juan Bisquert, Sang Il Seok

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

Figure Persented: Nanoporous metal oxide electrodes provide a high internal area for dye anchoring in dye-sensitized solar cells, but the thickness required to extinguish the solar photons also enhances recombination at the TiO 2/electrolyte interface. The high extinction coefficient of inorganic semiconductor absorber should allow the reduction of the film thickness, improving the photovoltage. Here we study all-solid semiconductor sensitized solar cells, in the promising TiO 2/Sb 2S 3/P3HT configuration. Flat and nanostructured cells have been prepared and analyzed, developing a cell performance model, based on impedance spectroscopy results, that allows us to determine the impact of the reduction of metal oxide film thickness on the operation of the solar cell. Decreasing the effective surface area toward the limit of flat samples produces a reduction in the recombination rate, increasing the open circuit potential, V oc, while providing a significant photocurrent. However, charge compensation problems as a consequence of inefficient charge screening in flat cells increase the hole transport resistance, lowering severely the cell fill factor. The use of novel structures balancing recombination and hole transport will enhance solid sensitized cell performance.

Original languageEnglish
Pages (from-to)873-880
Number of pages8
JournalACS nano
Volume6
Issue number1
DOIs
Publication statusPublished - 2012 Jan 24
Externally publishedYes

Keywords

  • TiO /Sb S /P3HT
  • dye-sensitized solar cells
  • nanostructured cells
  • photovoltaics

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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