Jump to main content
Jump to site search

Issue 41, 2011
Previous Article Next Article

Improved conversion efficiency of CdS quantum dot-sensitized TiO2 nanotube-arrays using CuInS2 as a co-sensitizer and an energy barrier layer

Author affiliations

Abstract

A thin layer of CuInS2 and CdS quantum dots (QDs) is deposited on TiO2 nanotube arrays (TNTs) to form CdS/CuInS2/TNTs photoelectrodes. The CuInS2 layer is prepared by a successive ionic layer absorption and reaction method, and the CdS QDs are deposited by a chemical bath deposition method. The CuInS2 layer acts as both a co-sensitizer and an energy barrier layer between TNTs and CdS QDs. The deposited CuInS2 layer significantly extends the visible-light response of CdS-sensitized TNTs into 500–700 nm wavelength range. As a consequence, the photoelectrochemical response of the CdS/CuInS2/TNTs electrodes is much improved compared with CdS sensitized TNTs. The CdS/CuInS2/TNTs electrodes exhibit a maximum power conversion efficiency of 7.3%, which is a 120% improvement compared with the highest efficiency of 3.3% for CdS/TNTs electrodes in our study. The improved efficiency is mainly due to the increased absorbance and the reduced recombination between the photoinjected electrons and the redox ions from the electrolyte, resulting from the formation of a CuInS2 layer.

Graphical abstract: Improved conversion efficiency of CdS quantum dot-sensitized TiO2 nanotube-arrays using CuInS2 as a co-sensitizer and an energy barrier layer

Back to tab navigation

Publication details

The article was received on 29 Jul 2011, accepted on 19 Aug 2011 and first published on 15 Sep 2011


Article type: Paper
DOI: 10.1039/C1JM13616J
Citation: J. Mater. Chem., 2011,21, 16430-16435
  •   Request permissions

    Improved conversion efficiency of CdS quantum dot-sensitized TiO2 nanotube-arrays using CuInS2 as a co-sensitizer and an energy barrier layer

    C. Chen, G. Ali, S. H. Yoo, J. M. Kum and S. O. Cho, J. Mater. Chem., 2011, 21, 16430
    DOI: 10.1039/C1JM13616J

Search articles by author

Spotlight

Advertisements