Development of Self-Assembled Electrodes for Efficiency Enhancement of Dye Sensitive Solar Cell Systems

• Main Authors: Pei-hwung Chen, 陳沛桓
• Other Authors: Hsin-Yi Lai
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/43448952960973114081

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 96 === Amorphous Silicon Solar Cells have detrimental light corrosiveness on sunlight in the application of solar cells and low efficiency, so only can be used indoors. In recent years, efficiency in Crystal-Si Solar Cell have gradually reached limit, and because with its complication of manufacture and expensive cost, it is difficult for further to be extensive application. In light exciting dyes, the porous semiconductor electrode of Dye Sensitive Solar Cell can be extented to the absorption spectrum of the sunlight to the visible light and infrared light area. By comparing with the crystallization silicon solar cell, it is simpler to manufacture with lower costs, low pollution, and is suitable for extensive application, stable performance and good resisting corrosiveness, and it’s performance is stable under high temperature, require the low light incidence angle, and still have performance of good batteries on the low angle, so have good potential of development in the future. In tradition we used sol-gel method to manufacture the porous electrode of dye sensitive solar cell, and in this manufacturing process we needed a thermal decomposition of the organic matter in 500-600℃ to limit the large area of the conductive glass membrane. Therefore, if we can use the powder coating method to make the porous electrode and totally have control of the parameters in producing and the structure of the porous electrodes to increase the efficiency of dye sensitive solar cells, these extensive applications of dye sensitive solar cells can be a huge break through in the future. Therefore, in this research we use Brown dynamics theory to establish the theory for forming porous membranes, simulate the drying process of these membranes in the colloid solution, and establish the working potential energy and the simulating system in the process of forming porous electrodes by using the powder coating method. Coordinating with those parameters of the structure of membranes in electrodes like the structure of membranes to estimate the degree of porosity and the coordination number of particles, etc, we will design the simulation for the important factors in systems to find out the noticeable factors and reciprocation terms and establish the return model of noticeable factors. At the same time, we take the structure of membranes to estimate the efficiency of electrodes by using the results of experimental designs combining with the estimating efficient model of the photoelectric conversion of dye sensitive solar cells, and compare with the literatures to prove the correctness and practicability. Finally, we model the results and control the noticeable parameters to estimate the efficiency systematically by the designing procedures to reach the requirement, and take an example to prove the model practicability. In this research, we use Brown dynamics to establish the model of the formation of electrodes, and join the effect of side capillary forces between those particles. By the analysis of side capillary forces, we prove that side capillary forces effect observably and this result raises the correctness of simulations of forming porous membranes. At the same time, we use the experimental design method to discuss the effects of the electrode structure and the procedures to the efficiency dividedly, and establish the theoretical model of the electrode structure to reciprocations of the efficient factors. Then integrating the experimental design model of the electrode formation and the estimating efficiency to estimate efficiency and comparing with literatures, different from the traditional linear model, the experimental design model that taking in the side capillary forces including reciprocation terms can reduce the error from 15.78% to 2.24%. Finally after comparing with literatures to prove the correctness in this research, we design an example in application by this structure of porous electrode membranes. With searching results of the optimum structure and parameters in procedures in our experimental design, we can bring up an optimum structure of the porous electrode membrane to find out the best producing parameters quickly. In my design procedure, as using the same black dye in references, the optimum parameters can make the best photoelectric conversion efficiency raise from 10.4% to 12.45% largely, so this research is helpful to be the reference of optimal procedures of porous electrode in Dye Sensitive Solar Cells in the future.