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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49247 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Faez، Rahim
- Abstract:
- Solar cells are one of the most promising clean and readily available energy sources. Organic solar cells as a new generation of solar cells, have attracted strong attention in recent years, due to the advantages of flexibility, thinness, and simple manufacturing process. This work focuses on the electrical processes in organic solar cells and approaches for enhancing the efficiency of solar cell by employing two-dimensional drift-diffusion model. At the first step. We investigate the role of different parameters such as mobility (considering different recombination mechanisms), active layer thickness, light intensity, barrier injections and energetic disorder on the performance of single layer bulk heterojunction organic solar cells, then we add electron/hole transport layers to the structure and investigate the role of this layers with different materials on the performance of the device. After providing in-depth knowledge of organic solar cells, we utilize two structures for enhancing the efficiency of solar cell.1) A novel organic-inorganic hybrid tandem solar cells with inverted structure is proposed. This efficient double-junction hybrid tandem solar cell consists of a single-junction hydrogenated amorphous silicon (a-Si:H) subcell with n-i-p structure as front cell and a P3HT:PCBM organic subcell with inverted structure as back cell. In order to optimize the hybrid tandem cell, we have performed a simulation based on transfer matrix method. We have compared the characteristics of this novel structure with a conventional structure. As a result, a power conversion efficiency (PCE) of 6.1% and 24% improvement compared to the conventional hybrid tandem cell was achieved. We also discuss the high potential of this novel structure for realizing high stability organic-inorganic hybrid photovoltaic devices. 2) We use a metallic grating structure for application to an inverted organic solar cell. The grating structure provides broadband optical absorption spectra. A coupled optical-electrical simulation shows a ~11% enhancement in the efficiency and ~26% in short circuit current.
- Keywords:
- Metallic Grating ; Organic Solar Cells ; Bulk Heterojunction ; Hybrid Solar Cell
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