Quantum Rod-Sensitized Solar Cell: Nanocrystal Shape Effect on the Photovoltaic Properties

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• 作者：Asaf Salant ; Menny Shalom ; Zion Tachan ; Sophia Buhbut ; Arie Zaban ; Uri Banin
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：April 11, 2012
• 年：2012
• 卷：12
• 期：4
• 页码：2095-2100
• 全文大小：310K
• 年卷期：v.12,no.4(April 11, 2012)
• ISSN：1530-6992

文摘

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 TiO₂ electrodes and compared with quantum dots. Photovoltaic efficiency values of up to 2.7% were measured for the QRSSC, notably high values for TiO₂ 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 TiO₂ energy bands relative to the quantum rods, leading to improved charge injection.

Keywords:

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