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The
University of Queensland
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The possibilty of quantum dots as dye replacements in dye sensitized solar cells has been theoretically suggested [1]. The size selective growth characteristic of quantum dots allows absorption tuning. Potentially PbS could span the whole spectrum. Secondly emission at longer wavelength is observed which could be utilised in a second absorbing layer.
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We exploit the photovoltaic properties of quantum dots with plans to use them as dye replacements in dye sensitised cells such as those designed by Gratzel[2]. An advatage of QD`s is that they are more stable than dyes of their crystalline nature. Also dyes have low efficiency due to re-absorption whereas qd emission is red shifted away from absorption
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Quantum Dot Sensitised Titania Solar Cell |
Cell Operation
Electron transport in the quantum dot sensitised titania solar cell.
A photon excites an electron in QD which is swept away by the in-built electric field into the TiO2/SnO2 electrode and conducted around the circuit. At the Pt/SnO3 electrode the electron is transferred into the electrolyte which acts as an electron shuttle to the QD.
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