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Fabrication of Thin Layers Semiconductor Based on CTS

Jalali Chamani, Hesam | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54451 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Mahdavi, Mohammad
  7. Abstract:
  8. Copper-based semiconductors have received a great deal of attention due to their high absorption coefficient, direct and adjustable energy gap with stoichiometry, low frequency and toxicity. Multicomponent nanocrystals such as CuInS2, Cu (In, Ga) (S, Se) 2, Cu2ZnSnS4 and Cu2SnS3 (CTS) have been successfully synthesized by colloidal synthesis and have shown application potentials such as energy conversion, photocatalyst, thermoelectric and biomedical. Among these, the CTS ternary semiconductor with p-type conduction is one of the most well-known compounds of group I-IV-VI, which consists of abundant and non-toxic elements. In this research, thin-film solar cells with FTO / TiO2 / In2S3 / CdS / CTSe configuration with a surface structure have been fabricated using large-scale layering methods and using a three-component CTS combination. The layers of the cavity block and the electron transmitter (buffer) are layered by heat-spraying method, the adsorbent layer is layered by printing method and the carbon bonding is layered by Dr. Blade method. Initially, the cells were structurally optimized using different buffer layers. Then, using this optimal structure (FTO / TiO2 / In2S3 / CdS / CTS), a comparison was made between the thermal processes of selenization and sulfurization, which showed a better performance in terms of photovoltaics after examining the heating process of selenization. After this step, the thickness of TiO2 (6ml) and In2S3 (12ml) layers is optimized, which helps to improve cell function. Then, by optimizing the selenization process, the temperature of 310∘C for 5 minutes is selected as the optimal parameter. The morphological, structural, electrical and optical properties of these layers and the photovoltaic properties of the constructed solar cells are also examined. The best cells built using the above optimizations have short circuit current density, open circuit voltage, efficiency and charge index of 32.28 mA/cm2, 0.42, 4.16% and 31%, respectively
  9. Keywords:
  10. Solar Cells ; Chalcogenide Thin Films ; Large Scale Fabrication Methods ; CTS Solar Cells (Cu2SnS3) ; CTSe Solar Cells (Cu2SnSe3) ; CZTSe Solar Cells

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