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

Menny Shalom, Idan Hod, Zion Tachan, Sophia Buhbut, Shay Tirosh, Arie Zaban

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

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 photoelectrochemical 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 photoelectrochemical 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.

Original languageEnglish
Pages (from-to)1874-1878
Number of pages5
JournalEnergy and Environmental Science
Volume4
Issue number5
DOIs
StatePublished - 1 May 2011
Externally publishedYes

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