Jump to main content
Jump to site search

Issue 23, 2017
Previous Article Next Article

Zinc-diffused silver indium selenide quantum dot sensitized solar cells with enhanced photoconversion efficiency

Author affiliations

Abstract

Alloying of quantum dots (QDs) with suitable metal ions is one of the efficient tools to enhance the power conversion efficiency (PCE) of QD sensitized solar cells (QDSSCs). Ternary AgInX2 (X = S, Se) based liquid-junction QDSSCs have low PCEs due to the presence of defect states at internal atom vacancies. However, Zn2+ diffusion at these vacant sites can improve the carrier mobility of the QDs. The QDSSCs with Zn2+-diffused AgInSe2 (ZAISE) QDs have a broad light harvesting range up to the near-infrared (NIR) range. PCE was enhanced from a merely 1.67% for pristine AgInSe2 QDs (AISE) to 3.07% for ZAISE with a Zn/(Ag + In) ratio of 48.2%, aided by an optimized ZnS passivation layer on the photoanode. The device efficiency was further improved to 3.57% by applying dual passivation of amorphous TiO2 and SiO2 layers. This approach could effectively suppress the recombination pathways at the QD surface and thereby minimize back electron transfer from photoexcited electrons of QDs and from the conduction band of TiO2 to the polysulfide electrolyte. The combined strategy of alloying with Zn2+ and inorganic passivation could achieve the highest ever PCE of environmentally friendly AgInX2 based QDSSCs.

Graphical abstract: Zinc-diffused silver indium selenide quantum dot sensitized solar cells with enhanced photoconversion efficiency

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Jan 2017, accepted on 17 Feb 2017 and first published on 20 Feb 2017


Article type: Paper
DOI: 10.1039/C7TA00268H
Citation: J. Mater. Chem. A, 2017,5, 11746-11755
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    Zinc-diffused silver indium selenide quantum dot sensitized solar cells with enhanced photoconversion efficiency

    G. Halder and S. Bhattacharyya, J. Mater. Chem. A, 2017, 5, 11746
    DOI: 10.1039/C7TA00268H

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements