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Issue 5, 2011
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Quantum dot based anode and cathode for high voltage tandem photo -electrochemical solar cell

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Abstract

A thin layer of CdSe quantum dots (QDs) deposited on a conductive glass was used as a photo-anode in photo-electrochemical solar cells yielding a photovoltage of 675 mV and 2 mA cm−2 short circuit photocurrent. The response of the QD based photoactive electrodes correlated with the absorption spectra of the QDs which is easily tuned by size modification. Similar geometry based on acid treated CdS quantum dots, provided a photo-cathode with complementary photovoltage. A tandem photo-electrochemical cell consisting of the two photoactive electrodes exhibits Voc of 816 mV. The tandem configuration enables achieving the highest photovoltage reported to date for QD based photo-electrochemical cells. However, current matching still requires optimization of the spectral response and charge collection efficiencies of the two photoactive electrodes. The results demonstrate a new approach for the beneficial utilization of QDs in photo-electrochemical cells towards efficient, low cost photovoltaics.

Graphical abstract: Quantum dot based anode and cathode for high voltage tandem photo -electrochemical solar cell

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Article information


Submitted
08 Feb 2011
Accepted
15 Mar 2011
First published
12 Apr 2011

Energy Environ. Sci., 2011,4, 1874-1878
Article type
Paper

Quantum dot based anode and cathode for high voltage tandem photo -electrochemical solar cell

M. Shalom, I. Hod, Z. Tachan, S. Buhbut, S. Tirosh and A. Zaban, Energy Environ. Sci., 2011, 4, 1874
DOI: 10.1039/C1EE01145F

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