Characterisation and simulation of Cu2ZnSnS4 absorber layers fabricated by sequential DC magnetron sputtering and rapid thermal processingG

Zhukova, Maria;Kotipalli, Raja Venkata Ratan;Samain, Louise;Fourdrinier, Lionel;Flandre, Denis
(2017) 33rd European PV Solar Energy Conference and Exhibition (PVSEC 2017) — Location: Amsterdam (the Netherlands) (25.September.2017)

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CHARACTERIZATIONANDSIMULATIONOFCU2ZNSNS4ABSORBERLAYERSFABRICATEdBYSEQUENTIALDCMAGNETRONSPUTTERINGANDRAPIDTHERMAL.pdf
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Authors
  • Zhukova, MariaUCLouvain
    Author
  • Kotipalli, Raja Venkata RatanUCLouvain
    Author
  • Samain, LouiseCRM Group, Liège/Belgium
    Author
  • Fourdrinier, LionelCRM Group, Liège/Belgium
    Author
  • Flandre, DenisUCLouvain
    Author
Abstract
The thin-film Cu2ZnSnS4 (CZTS) solar cell technology is seen as a sustainable and low cost alternative to the CIGS technology. However mastering the CZTS formation is not evident. In particular, the deposition parameters of each layer in the metallic precursor impact on properties of these layers and could influence the final Cu2ZnSnS4 (CZTS) absorber quality. To verify and quantify these influences, two kinds of samples with low-density and high-density precursors have been fabricated by sequential DC magnetron sputtering and finalized into CZTS by Rapid Thermal Processing (RTP) with presence of elemental sulfur. In addition to optical and material characterizations, Hall measurements were carried out for estimation of the carrier concentration, mobility and conductivity of fabricated layers. Finally, SCAPS simulations have been run to predict the cell efficiency and compare with experiments. This study demonstrates that appropriate optoelectrical properties : EG ~ 1.5-1.6 eV, α > 2 - 3×104 cm-1, μh ~ 25-30 cm²V-1s-1, p ~ 5-6×1015 cm-3, rather than absorber composition and morphology, are the success criteria for obtaining high-efficiency (~ 10 %) CZTS-based devices. Therefore, a monitoring of the optoelectrical parameters during the fabrication steps may be particularly relevant to assess the absorber quality in industrial process.
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Zhukova, M., Kotipalli, R. V. R., Samain, L., Fourdrinier, L., & Flandre, D. (2017). Characterisation and simulation of Cu2ZnSnS4 absorber layers fabricated by sequential DC magnetron sputtering and rapid thermal processingG. proceedings of the 33rd European PV Solar Energy Conference and Exhibition, 6. https://hdl.handle.net/2078.5/223178