染料改質二氧化鈦與有機半導體異質接面混摻太陽能電池的機制研究

在本研究中我們建構一個混合式異質接面結構有機導電高分子太陽電池的理論模型，其中包含光子在活化層被受體吸收、光激子的移動、電子電洞的分離、電子(電洞)在活化層內的漂移和邊界上的載子熱注入。利用數值方法解卜瓦松與連續體方程式，再藉由布朗模型描述電子與電動的解離，藉此來描述導電高分子太陽能電池的放電表現，而後更進一步的將其拓展到表面改質金屬氧化物與導電高分子混掺的太陽能電池。我們發現在表面改質金屬氧化物與導電高分子混掺太陽能電池中，可以有效的把電荷轉移態與自由載子間的解離速率大幅提升，造成二氧化鈦表面改質與導電高分子混摻太陽能電池的填充因子(fill factor)與開環電壓(open circuit voltage)比純有機混摻太陽能電池大的多。但與純有機系統相較，其光激子轉變為電荷轉移態的效率沒有來的好(~100%)，應是其光電轉化效率較低的主因。

關鍵字

表面改質二氧化鈦與導電高分子混掺太陽能電池；數值模型；延伸指數函數；優化

並列摘要

In this thesis, we develop a theoretical model for modeling the current-voltage characteristics of surface modified TiO2/P3HT hybrid solar cells. This model considers the adsorption of photons, the excitation and transport of excitons, the formation of polaron, and its dissociation to free charge carriers. The transport of free charge carriers is governed by the poisson and continuity equations. We found that the surface modifier enhances the efficiency of polaron dissociation. The efficient polaron dissociation can result in high fill factor and high open circuit voltage. However, compared with the organic polymer solar cells, there is a significant loss of excitons before they can be converted to poalrons in surface modified TiO2/P3HT solar cell. This is the main reason for the lowered efficiency of the surface modified TiO2/P3HT solar cells.

並列關鍵字

surface modifier TiO2/P3HT hybrid solar cell ； stretched exponential ； theoretical model

參考文獻

10. Chidichimo, G. and L. Filippelli, Organic Solar Cells: Problems and Perspectives. International Journal of Photoenergy, 2010.

2. Blom, P.W.M., V.D. Mihailetchi, L.J.A. Koster, and D.E. Markov, Device physics of polymer : fullerene bulk heterojunction solar cells. Advanced Materials, 2007. 19(12): p. 1551-1566.

5. Gratzel, M., Photoelectrochemical cells. Nature, 2001. 414(6861): p. 338-344.

6. Tang, C.W. and A.C. Albrecht, Photovoltaic Effects of Metal-Chlorophyll-A-Metal Sandwich Cells. Journal of Chemical Physics, 1975. 62(6): p. 2139-2149.

7. Tang, C.W., 2-Layer Organic Photovoltaic Cell. Applied Physics Letters, 1986. 48(2): p. 183-185.

國際替代計量

染料改質二氧化鈦與有機半導體異質接面混摻太陽能電池的機制研究

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