Enhancement of photoconversion efficiency in dye-sensitized solar cells exploiting pulsed laser deposited niobium pentoxide blocking layers

Mauro Mosca, Roberto Macaluso, Claudio Cali', Stefano Bianco, Matteo Gerosa, Adriano Sacco, Candido Fabrizio Pirri, Angelica Chiodoni

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Among all the photovoltaic technologies developed so far, dye-sensitized solar cells are considered as a promising alternative to the expensive and environmentally unfriendly crystalline silicon-based solar cells. One of the possible strategies employed to increase their photovoltaic efficiency is to reduce the charge recombination at the cell conductive substrate through the use of a compact blocking layer. In this paper, we report on the fabricationand characterization of dye-sensitized solar cells employing niobium pentoxide (Nb2O5) thinfilm blocking layer deposited through the pulsed laser deposition technique on conductive substrates. The careful selection of the optimalfilm thickness led to a 30% enhancement of the photoconversion efficiency with respect to reference cells fabricated without blocking layer. Open circuit voltage decay and electrochemical impedance spectroscopy techniques proved that the effective suppression of the charge recombination occurring at the substrate/electrolyte interface represents the main reason for the improvement of the photovoltaic efficiency.
Original languageEnglish
Pages (from-to)38-42
Number of pages5
JournalThin Solid Films
Volume574
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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