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Preparation of Colloidal Chalcopyrite Nanoparticles Aimed for Device-Quality Thin Films Used in Solar Cell Applications

Khosroshahi, Rouhollah | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54795 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Taghavinia, Nima; Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this research, the technology of fabrication and deposition of nanoparticle inks from chalcogenide compounds and then use of them in the fabrication of CuInGaS2 and Perovskite thin-film solar cells have been considered. In the first step, the synthesis of CuInGaS2 family compounds with variable In / Ga ratio and also the change of the stoichiometric ratio of Cu component using oleylamine solvent is investigated. In addition to these compounds, the synthesis of CuSnS, CuBaSnS, and CuZnSnS nanoparticles is also investigated. The synthesized nanoparticles were analyzed by XRD, DLS, UV-Vis, ICP, PL, SEM, EDX, and TEM. Then, the stability of the ink made of CuInGaS2 nanoparticles in different solvents was investigated using a new method, namely UV-Vis spectroscopy over time examined the long-term stability of the inks and selected the best option for further stability, which was the same as CIGS ink in chloroform solvent. For this purpose, a wide range of solvents and their compounds, including polar to non-polar solvents (water, methanol, ethanol, chloroform, toluene, and their various compounds), a total of 16 solvent compounds have been studied. Examining the changing the spectrum passing through each ink over time allows the study of the process of agglomeration or stability of the ink. Next, the acquisition of nanoparticle ink deposition technology to form a uniform layer is studied, and various chemical deposition methods are investigated. In the meantime, the spin coating method had the best response; Of course, this is achieved by the idea of cooling the chloroform nanoparticle ink. The next step in this project is the development of CuInGaS2 thin-film solar cells and perovskite, after acquiring the uniform deposition technology of CIGS nanoparticles. In the construction of CuInGaS2 substrate solar cells, the general structure was as follows: SLG / Mo / CIGS / CdS / ZnO / AG NW / Carbon. Therefore, in addition to the deposition of the CuInGaS2 adsorbent layer, the deposition of other layers was also important. The process of selenization of the CuInGaS2 layer is also one of the key steps of this cell, which has also been studied by making an RTP device. Of course, this cell was not eventually made due to the lack of equipment to deposition of Mo on the glass; However, the technologies of making other layers were finalized. In the perovskite solar cell section, the CIGS layer has been used as the HTL layer as an alternative to the Spiro compound. The general structure of perovskite cells is FTO / TiO2 Block / TiO2 Meso / Perovskite / CIGS / Contact (Au, Carbon). Due to this structure, two different cell categories have been used in this section. Evaporative gold deposition and carbon paste deposition as the final contact of the cell, which in both cases, efficiency above 16%, similar to the cells by Spiro-OMETAD as HTL was achieved; That was one of the important results of this study
  9. Keywords:
  10. Chemical Synthesis ; Perovskite ; Solar Cells ; Chalcopyrite Solar Cell ; Colloidal Ink ; Copper Indium Gallium Selenide (CIGS)Solar Cell ; Ultra Violet-Visible ; Selenization ; Nanoparticle Ink

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