Singh, Om Pal and Gour, Kuldeep Singh and Parmar, Rahul and Singh, Vidya Nand (2016) Sodium induced grain growth, defect passivation and enhancement in the photovoltaic properties of Cu2ZnSnS4 thin film solar cell. Materials Chemistry and Physics, 177. pp. 293-298. ISSN 0254-0584

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Sodium diffusion from soda lime glass (SLG) during high temperature annealing is known to play a crucial role in affecting the grain growth and defect passivation in chalocogenide/kesterite solar cells. Additional sodium is required when low temperature or short term annealing is used. Although this fact is known, a systematic comparative study for kesterite films is seldom reported. In the present study, Cu2ZnSnS4 thin films were deposited on SLG and Mo coated SLG using stacked layer reactive sputtering. Na was deposited over the CZTS thin film and the film was annealed in N-2 atmosphere in order to enhance the grain growth. This resulted in the shift in the XRD peak towards lower diffraction angle. The optical bandgap shifted from 1.45 eV to 1.38 eV with Na addition. Significant grain growth from hundreds of nanometer to micrometer was observed in samples with Na. Device fabricated in SLG/Mo/CZTS/CdS/ZnO/ITO configuration with Al front contact shows increase in efficiencies values from 1.50% to 2.84%.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Uncontrolled Keywords: Thin films Sputtering Visible and ultraviolet spectrometers Microstructure
Subjects: Materials Science
Depositing User: Dr. Rajpal Walke
Date Deposited: 17 Apr 2018 12:18
Last Modified: 17 Apr 2018 12:18

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