| Summary: | 博士 === 國立中興大學 === 電機工程學系所 === 99 === Due to the material cost dropping and the efficiency improving, the manufacturing cost can be reduced under US$ 0.7/W. Thin film solar cells become the most potential photovoltaic cells. In this dissertation, the basic theorem and the electrical character of photovoltaic are first introduced; and, the advantage/disadvantage and the limitation of traditional thin film solar cells are discussed. For the solutions, novel thin film solar cells are then provided.
The main idea of novel solar cells is based on the dividing methods of photon absorption and carrier transport to improve the photo voltaic efficiency. TCAD, a popular tool for device simulations, is used to verify the idea. Before the simulation, the material character and the model parameters of the silicon-based solar cells, such as density of state for the a-Si(a-SiC) band structure, generation and recombination model and so on, are first studied to calibrate and simulate the device electrical behavior. The AM 1.5 solar radiation and transfer matrix (TMM) are further used to simulate the optical field in the novel cells. Finally, these models are used to simulate, to compare the traditional cells with the novel cells, and to find the efficiency improvement of the novel cells. The different cells dimensions are also used to see the change of the efficiency. The results can prove the thinking for this study and provide the consultation for the future work.
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