Quantum rod-sensitized solar cell: Nanocrystal shape effect on the photovoltaic properties

Asaf Salant, Menny Shalom, Zion Tachan, Sophia Buhbut, Arie Zaban, Uri Banin

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

The effect of the shape of nanocrystal sensitizers in photoelectrochemical cells is reported. CdSe quantum rods of different dimensions were effectively deposited rapidly by electrophoresis onto mesoporous TiO 2 electrodes and compared with quantum dots. Photovoltaic efficiency values of up to 2.7% were measured for the QRSSC, notably high values for TiO 2 solar cells with ex situ synthesized nanoparticle sensitizers. The quantum rod-based solar cells exhibit a red shift of the electron injection onset and charge recombination is significantly suppressed compared to dot sensitizers. The improved photoelectrochemical characteristics of the quantum rods over the dots as sensitizers is assigned to the elongated shape, allowing the build-up of a dipole moment along the rod that leads to a downward shift of the TiO 2 energy bands relative to the quantum rods, leading to improved charge injection.

Original languageEnglish
Pages (from-to)2095-2100
Number of pages6
JournalNano Letters
Volume12
Issue number4
DOIs
StatePublished - 11 Apr 2012
Externally publishedYes

Keywords

  • Quantum rods
  • photovoltage spectroscopy
  • quantum dots
  • quantum particle sensitized solar cells
  • transient photovoltage

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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