Jump to main content
Jump to site search

Issue 26, 2012
Previous Article Next Article

Arrays of CdSe sensitized ZnO/ZnSe nanocables for efficient solar cells with high open-circuit voltage

Author affiliations

Abstract

Highly ordered arrays of CdSe coated ZnO/ZnSe core–shell nanocables on FTO (SnO2 : F) glass substrates have been synthesized using ZnO nanowires as precursors via in situ successive ion exchanges without any organic ligands involved. While the low open-circuit voltage (VOC) (typically below 0.72 V) is a main factor limiting the power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSSCs), we design and exploit the arrays of ZnO/ZnSe/CdSe nanocables as efficient photoelectrodes for photoelectrochemical (PEC) solar cells, achieving a PCE of 4.54% and a VOC as high as 0.836 V by using a nanostructured Cu2S counter-electrode under AM 1.5G illumination with an intensity of 100 mW cm−2. The high photovoltage is attributed to the ZnSe layer with a high conduction band edge, which reduces carrier recombination by passivizing the surface of ZnO nanowires and upwardly shifts the conduction band of ZnO in the heterojunction. A VOC up to 0.855 V is achieved for the same cell using a typical platinized FTO (Pt/FTO) counter-electrode. However, the Cu2S counter-electrode, which is demonstrated to have higher catalytic activity, contributes to improvements in the fill factor (FF) and short-circuit current density (JSC) and consequently results in a 55% improvement in PCE.

Graphical abstract: Arrays of CdSe sensitized ZnO/ZnSe nanocables for efficient solar cells with high open-circuit voltage

Back to tab navigation

Supplementary files

Article information


Submitted
29 Mar 2012
Accepted
25 Apr 2012
First published
31 May 2012

J. Mater. Chem., 2012,22, 13374-13379
Article type
Paper

Arrays of CdSe sensitized ZnO/ZnSe nanocables for efficient solar cells with high open-circuit voltage

J. Xu, X. Yang, Q. Yang, T. Wong, S. Lee, W. Zhang and C. Lee, J. Mater. Chem., 2012, 22, 13374
DOI: 10.1039/C2JM31970E

Search articles by author

Spotlight

Advertisements