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Issue 11, 2018
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High current density cation-exchanged SnO2–CdSe/ZnSe and SnO2–CdSe/SnSe quantum-dot photoelectrochemical cells

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Abstract

Research on the combination of low and high-bandgap energy materials through an ion-mediated chemical transformation of the nanostructure of one material into another, especially metal chalcogenide quantum dot (QD) solar cells plays a very important role in the fast charge transformation process with high power conversion efficiencies (PCE) by reducing surface charge recombinations. Based on a coordination chemistry approach, the present study demonstrates the importance of cation-exchange process in developing bandgap engineering of tin oxide–cadmium selenide (SnO2–CdSe) with zinc selenide (ZnSe) and tin selenide (SnSe) to form SnO2–CdSe/ZnSe and SnO2–CdSe/SnSe electrodes, respectively. Experimental conditions are optimized from optical and photovoltaic performances. Our best performing cation-exchange interface-modified photoelectrochemical devices, i.e., SnO2–CdSe/ZnSe and SnO2–CdSe/SnSe have achieved improvements of 21% and 28%, respectively, in their PEC values, i.e., 3.78% and 4.41% with remarkable current densities of 19.82 and 28.40 mA cm−2 when compared with SnO2–CdSe (1.63% and 9.74 mA cm−2). This is due to (a) the fast transfer of photo-generated electrons from the CdSe QD sensitizer to SnO2 photoanode by engineering a synergistically favourable band gap and (b) mitigation of a reverse photogenerated electron flow in the presence of a high band gap buffer ZnSe/SnSe layer, which would otherwise cause excessive recombinations. A simple cation-exchange interface modification process can, in general, pave the way for improving the performance of QD-based solar cells.

Graphical abstract: High current density cation-exchanged SnO2–CdSe/ZnSe and SnO2–CdSe/SnSe quantum-dot photoelectrochemical cells

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Publication details

The article was received on 22 Mar 2018, accepted on 09 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01409D
Citation: New J. Chem., 2018,42, 9028-9036
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    High current density cation-exchanged SnO2–CdSe/ZnSe and SnO2–CdSe/SnSe quantum-dot photoelectrochemical cells

    Mu. Naushad, M. R. Khan, S. S. Bhande, S. F. Shaikh, S. M. Alfadul, P. V. Shinde and R. S. Mane, New J. Chem., 2018, 42, 9028
    DOI: 10.1039/C8NJ01409D

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