| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === In recent years, development of higher efficiency of Silicon-Based Solar Cells have gradually reached its technical summit. The complication associated with their manufacture and expensive product cost, has made it difficult to further extend for advanced applications. On the other hand, Dye-Sensitized Solar Cells (DSSCs) gradually received higher attention because of their low-cost, simple manufacture and good for low-light incident. Therefore, the development of DSSCs has emerged as a potential research area in recent years. The development of DSSC still have low efficiency problem and cannot be used to control the electrodes for self-assembled at this stage. However, the development of possesses great potential in near future. In view of that, this thesis intends to systematically investigate the possible multi-layer manufacture of electrode to enhance the overall system efficiency of DSSCs.
Brown dynamics was employed to establish the theory for forming porous membranes in this study. The drying process of membranes in the colloid solution, the working potential energy with Coulomb dipole force and the simulating system in the process of forming porous electrodes are fully developed. The results are then compared with those from literature and found satisfactory. The porosity and average coordination number thus obtained are obviously close to the real situations. The simulation for identifying significant factors in manufacture process of electrodes was carried out to ensure the accuracy of the system model.
By using the electrode of composite film of heterogeneous sensitive dye to replace the electrode made of monolayer film with multi-layers, the capacity of electron diffusion, optical absorption, and region of absorption spectrum of sun light are enhanced effectively so as to increase the efficiency of the DSSC. The model to calculate the efficiency of electrodes of composite film is based on electron continuous equation, electron transmission theorem and redox electrolyte equation. The results are verified and compared with those given in the literature it is found that the model proposed here is accurate and highly feasible. The theory presented in this study is nonlinear and complex, with porous film structure and production parameters of DSSC in electrode and battery system manufacturing. The design theory for a high-accuracy and time-saving model of DSSC by using experimental design method incorporated with both manufacturing of electrode and battery system with significant factors and the associated applications. The employment of both the theory and the experimental model allow the engineers to design the electrode with expected higher efficiency.
Contributions of this research includes: (1) A design theory for high-accuracy and time-saving DSSC systems is proposed. The procedure of optimum parameters can come up with better efficiency of DSSC raise from 13.15% (Y123,YD2-o-C8) to 14.68% (JK-1,Y123,YD2-o-C8) by increasing electrode layers from one to two and three for dye-sensitized(JK-1); (2) For a given specific efficiency and cost, the given expected cost from industry is about US$1.0 in the long run, the corresponding efficiency for our device now is approximately 12.93%, that can already be used in BIPV design for economic benefits; (3) By using the devices given in this study the saturated and power generation cost per watt are approximately at US$1.71 and 14.42% (TiO2,N719,R535-4TBA). This indicated that further research and development for novel materials and new design method for DSSC to save costs and to enhance efficiency are desperately needed.
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