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

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

doi:10.1021/nl300356e

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

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

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

123 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 language	English
Pages (from-to)	2095-2100
Number of pages	6
Journal	Nano Letters
Volume	12
Issue number	4
DOIs	https://doi.org/10.1021/nl300356e
State	Published - 11 Apr 2012

Keywords

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/nl300356e

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title = "Quantum rod-sensitized solar cell: Nanocrystal shape effect on the photovoltaic properties",

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.",

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AU - Zaban, Arie

AU - Banin, Uri

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AB - 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.

KW - Quantum rods

KW - photovoltage spectroscopy

KW - quantum dots

KW - quantum particle sensitized solar cells

KW - transient photovoltage

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

Abstract

Keywords

UN SDGs

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