Effect of sodium addition on Cu-deficient CuIn1-xGaxS2 thin film solar cells

    Authors

    P. S. Vasekar;N. G. Dhere

    Comments

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    Abstract

    Chalcopyrites are important contenders among solar-cell materials due to direct band gap and very high-absorption coefficients. Copper-indium-gallium disulfide (CIGS2) is a chalcopyrite material with a near-optimum band gap of 1.5 eV for terrestrial as well as space applications. At FSEC PV Materials Laboratory, record efficiency of 11.99% has been achieved on a 2.7 mu m CIGS2 thin film prepared by sulfurization. There are reports of influence of sodium on copper-indium-gallium selenide (CIGS) as well as copper-indium disulfide (CIS2) solar cells. However, this is the first of its kind approach to study the effect of sodium on CIGS2 solar cells and resulting in encouraging efficiencies. Copper-deficient CIGS2 thin films were prepared with and without the addition of sodium fluoride (NaF). Effects of addition of NaF on the microstructure and device electrical properties are presented in this work. (C) 2008 Elsevier B.V. All rights reserved.

    Journal Title

    Solar Energy Materials and Solar Cells

    Volume

    93

    Issue/Number

    1

    Publication Date

    1-1-2009

    Document Type

    Article

    First Page

    69

    Last Page

    73

    WOS Identifier

    WOS:000261816600017

    ISSN

    0927-0248

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