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Vapor Assisted Solution Processing of Multi-cation Perovskites as the Absorber of Solar Cells

Arasteh Haghdost, Mahsa | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50991 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Taghavinia, Nima
  7. Abstract:
  8. In this research, we fabricated and characterized hybrid organic-inorganic perovskite solar. The purpose of this study was the fabrication of multi-cationic perovskite films with vapor-assisted solution process, which was carried out in two different atmospheric and low-pressure conditions. In this regard, the reference cells with CH3NH3PbI3 and HC(NH2)2PbI3 compositions were made, which yielded 15.2% and 7.19% efficiencies in atmospheric conditions, and 6.38% and 2.65% in low pressure conditions, respectively. To increase the stability and to improve cell device performance, Br anion was added to the CH3NH3PbI3 structure. In optimum conditions, the conversion efficiency was 12.18%. Further optimizations showed that the addition of Cs and MA cations to the structure of the FAPbI3 film could lead to improved photovoltaic parameters and cell performance. In this regard, at first, different percentages of cesium were added to this structure. In optimized mode, the structure of Cs0.1FA0.9PbI3 reached to the maximum efficiency of 7.77%. In the next step, the cells with the structure of MAxFA1-xPbI3 were fabricated reaching 3.33% and 5.31% efficiencies, respectively, under atmospheric and low-pressure conditions. Then, Cs cation was added to this structure, which had a significant effect on cell performance. The efficiency of Cs0.1FA0.9MAxPbI3 composition in atmospheric and low-pressure conditions was 5.53% and 7.30%, respectively. In order to increase the cell performance, the following step was adding bromine to the structure containing FA and MA. The result was the fabrication of the cells with perovskite structure of MAxFA1-xPb (I1-yBry)3 for the first time using vapor-assisted solution method, reaching the efficiencies of 10.06% and 8.58% under atmospheric and low-pressure conditions respectively
  9. Keywords:
  10. Solar Cells ; Perovskite ; Vapor-assisted Solution Process ; Organic Inorganic Perovskites

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