Single-step preparation and characterization of Cu2ZnSn(SxSe1−x)4 thin films deposited by pulsed laser deposition method

Cu2ZnSn(S,Se)4 (CZTSSe) thin films have been firstly deposited on heating quartz substrates by pulsed laser deposition (PLD) method using one-step process. The results of energy dispersive X-ray (EDX) spectroscopy show that there are some discrepancies of the elemental composition between targets and thin films. However, structural and optical properties of CZTSSe thin films show good tolerance to the composition deviation from stoichiometry. Both X-ray diffraction (XRD) and Raman spectra analysis indicate the internal compressive stress exists in CZTSSe thin films. Further transmission spectra demonstrate that the band gaps of CZTSSe thin films are higher than those of CZTSSe bulks. The internal compressive stress and the deficiency of Cu content in the films contribute to the enlargement of the band gaps of CZTSSe thin films.

[1]  A. Walsh,et al.  Compositional dependence of structural and electronic properties of Cu(2)ZnSn(S,Se)(4) alloys for thin film solar cells , 2011 .

[2]  Rakesh Agrawal,et al.  Fabrication of 7.2% efficient CZTSSe solar cells using CZTS nanocrystals. , 2010, Journal of the American Chemical Society.

[3]  Kentaro Ito,et al.  Electrical and Optical Properties of Stannite-Type Quaternary Semiconductor Thin Films , 1988 .

[4]  J. Chu,et al.  Structure, composition and optical properties of Cu2ZnSnS4 thin films deposited by Pulsed Laser Deposition method , 2011 .

[5]  Sipe,et al.  Pressure dependence of the band gaps of semiconductors. , 1989, Physical review. B, Condensed matter.

[6]  Jagdish Narayan,et al.  Theoretical model for deposition of superconducting thin films using pulsed laser evaporation technique , 1990 .

[7]  Tayfun Gokmen,et al.  Device characteristics of a 10.1% hydrazine‐processed Cu2ZnSn(Se,S)4 solar cell , 2012 .

[8]  K. Saenger.  On the origin of spatial nonuniformities in the composition of pulsed-laser-deposited films , 1991 .

[9]  Supratik Guha,et al.  The path towards a high-performance solution-processed kesterite solar cell ☆ , 2011 .

[10]  Narayan,et al.  Pulsed-laser evaporation technique for deposition of thin films: Physics and theoretical model. , 1990, Physical review. B, Condensed matter.

[11]  S. Miyajima,et al.  Development of thin film solar cell based on Cu2ZnSnS4 thin films , 2001 .

[12]  Teodor K. Todorov,et al.  Photovoltaic Devices: High‐Efficiency Solar Cell with Earth‐Abundant Liquid‐Processed Absorber (Adv. Mater. 20/2010) , 2010 .

[13]  M. Cardona,et al.  Dependence of the direct energy gap of GaAs on hydrostatic pressure , 1975 .

[14]  J. Chu,et al.  Composition dependence of structure and optical properties of Cu2ZnSn(S,Se)4 solid solutions: An experimental study , 2012 .

[15]  T. Raadik,et al.  Photoluminescence and Raman study of Cu2ZnSn(SexS1 − x)4 monograins for photovoltaic applications , 2011 .

[16]  A. Romeo,et al.  The second‐generation of CdTe and CuInGaSe2 thin film PV modules , 2011 .