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Engineering of Sodium Supply into Cu(In,Ga)Se2 Thin-Film Solar Cells

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We report the engineering of sodium (Na) supply into Cu(In,Ga)Se2 (CIGS) for thin-film solar cells. The methods of incorporation of Na and the relative Na content in CIGS were varied using a combination of sodalime glass (SLG) substrate and NaF as Na sources, and SiO x as diffusion barriers. The sample structures were CIGS/Mo/SiO x /SLG, CIGS/Mo/SLG, CIGS/15 nm-NaF/Mo/SLG, and post-15 nm-NaF/CIGS/Mo/SLG. The evaporation of NaF precursor prior to the CIGS process and the post-treatment of NaF were used for additional Na supplies. The Na content significantly increased in the Na-supplied CIGS as compared with the Na-deficient sample with the SiO x barrier. The additional NaF evaporation significantly enhanced the Na content in the CIGS films. The Na-containing CIGS solar cells showed superior photovoltaic performances compared with the Na-deficient solar cell. The open circuit voltage and fill factor were largely improved by supplying Na. The additional incorporation of Na via NaF post-treatment enhanced the cell efficiency up to 14% using both CdS and ZnS buffer layers.
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Keywords: CIGS SOLAR CELL; NA SUPPLY; NAF THIN FILM; SODA-LIME GLASS

Document Type: Research Article

Publication date: December 1, 2018

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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