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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jun Xu
  • Xia Yang
  • Qing-Dan Yang
  • Tai-Lun Wong
  • Shuit-Tong Lee

Detail(s)

Original languageEnglish
Pages (from-to)13374-13379
Journal / PublicationJournal of Materials Chemistry
Volume22
Issue number26
Publication statusPublished - 14 Jul 2012

Abstract

Highly ordered arrays of CdSe coated ZnO/ZnSe core-shell nanocables on FTO (SnO 2: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 (V OC) (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 V OC as high as 0.836 V by using a nanostructured Cu 2S 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 V OC up to 0.855 V is achieved for the same cell using a typical platinized FTO (Pt/FTO) counter-electrode. However, the Cu 2S counter-electrode, which is demonstrated to have higher catalytic activity, contributes to improvements in the fill factor (FF) and short-circuit current density (J SC) and consequently results in a 55% improvement in PCE. © 2012 The Royal Society of Chemistry.

Citation Format(s)

Arrays of CdSe sensitized ZnO/ZnSe nanocables for efficient solar cells with high open-circuit voltage. / Xu, Jun; Yang, Xia; Yang, Qing-Dan; Wong, Tai-Lun; Lee, Shuit-Tong; Zhang, Wen-Jun; Lee, Chun-Sing.

In: Journal of Materials Chemistry, Vol. 22, No. 26, 14.07.2012, p. 13374-13379.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review