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Issue 11, 2016
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Densely packed zinc sulfide nanoparticles on TiO2 for hindering electron recombination in dye-sensitized solar cells

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Abstract

We report new types of TiO2@CdS and TiO2@ZnS binary structures fabricated by decorating TiO2 surfaces with CdS or ZnS nanoparticles. The material characterization shows that the presence of CdS on the TiO2 surface results in a red-shift of the material band edge in the visible region compared to pure TiO2. A further enhancement of visible light was achieved by N719 dye loading on TiO2@CdS. The binary structure electrode with TiO2@ZnS-4 extended the absorption edge to the visible region and was used as an efficient photo-anode in dye-sensitized solar cells (DSSCs). The experimental results indicate that replacing Ti2+ with Zn2+ ions on the surface greatly increases the surface stability compared to TiO2. Furthermore, Zn and S impurities have a drastic impact on the host material and can create new energy states that can delay the exciton recombination and allow charge separation. The DSSCs based on the TiO2@ZnS-4 photo-anode achieved a power conversion efficiency (PCE) of 4.91% under one sun light illumination, which is higher than those of bare TiO2 (2.84%) and TiO2@CdS-4 (1.44%). This work demonstrates a promising way to design efficient photo-anodes for use in DSSCs that can achieve a high PCE with a lower recombination rate during electron transportation.

Graphical abstract: Densely packed zinc sulfide nanoparticles on TiO2 for hindering electron recombination in dye-sensitized solar cells

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Publication details

The article was received on 11 Aug 2016, accepted on 08 Sep 2016 and first published on 09 Sep 2016


Article type: Paper
DOI: 10.1039/C6NJ02493A
Citation: New J. Chem., 2016,40, 9176-9186
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    Densely packed zinc sulfide nanoparticles on TiO2 for hindering electron recombination in dye-sensitized solar cells

    H. Kim, J. Kim, I. K. Durga, D. Punnoose, N. Kundakarla, A. E. Reddy and S. S. Rao, New J. Chem., 2016, 40, 9176
    DOI: 10.1039/C6NJ02493A

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