利用軟性微影技術改善有機太陽能電池及白光發光二極體之效能

Using soft lithography to improve device efficiency of organic solar cells and white-light light emitting diodes

陳泰翔(Tai-Hsiang Chen)

指導教授 ： 陳學禮

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.02957

摘要

在本論文中，利用低成本，可量產化的軟性微影技術，在光電元件中製作有利於元件效率的微結構。其中，在第一部分的主題中，將在共軛高分子型有機太陽能電池上製作微結構，實驗中利用軟性微影技術在P3HT/PCBM主動層上方製作微結構後，藉著熱蒸鍍鋁在主動層上方，可以成功製作出具有結構的鋁電極。具有結構的鋁電極能夠具備有幾項優點，其中包括可以增加光線吸收量，其次可以增加有機太陽能電池中載子收集的機率，第三個優點則是可以大幅下降有機太陽能電池的串聯電阻值。綜合以上三點，製做出具有結構的鋁電極可以很明顯的改善有機太陽能電池的元件效能。
在第二部份的論文中，則針對螢光粉型白光發光二極體之出光效率作改善。在此部分的實驗中，同樣利用軟性微影技術，在螢光粉封裝層表面，製做出最有利於出光的結構。實驗先利用RCWA嚴格耦合波分析尋找出具有最好出光效率之結構，接著再利用光子能隙理論計算結構之光子能隙位置，最後實際將結構製作在螢光粉封裝曾上，進行出光效率的量測。由實驗結果可得知，在封裝層表面上製作結構，最佳的結構參數可以使出光效率增加10%。除此之外，實驗中還可以利用製作不同的微結構，改變元件不同出光的行為。

關鍵字

軟性微影術 ； 有機太陽能電池 ； 白光發光二極體 ； 出光效率

並列摘要

In this thesis, the author demonstrates a method utilizing soft lithography technique to construct various microstructures in organic photovoltaic devices (OPVs) and white-light light emitting diodes. The advantages of soft lithography are its large-area production, low-cost process and mechanical flexibility. In the first part of thesis, the author utilizes soft lithography to make the active layer surface of organic solar cells possess different structures, including periodic structure and non-periodic structure. Organic photovoltaic devices having microstructures can obtain more light absorption and better charge collection efficiency. Besides, these microstructures can reduce overall device resistance and obviously increase the efficiency of OPVs as well.
In the second part of this thesis, soft lithography is applied for patterning various microstructures on the surface of phosphor-converted white-light light emitting diodes. The microstructures can be used to improve light extraction efficiency of light emitting diodes. By using RCWA (Rigorous Coupled Wave Analysis) optical simulations, optimal parameters of different textured structures are obtained. Moreover, photonic band diagrams are obtained by using theoretical calculation for the optimization of microstructures. Then, experiment results are performed to prove optical simulation results. At least 10% light extraction efficiency enhancement can be achieved in this study.

並列關鍵字

soft lithography ； organic photovoltaic devices ； light emitting diodes ； light extraction rfficiency

參考文獻

1. Y. Xia, and G. M. Whitesides, Annu. Rev. Mater. Sci. (1998). 28:153–84

5. S. K. Sia, G. M. Whitesides, Electrophoresis (2003), 24, 3563–3576

6. D. Zhang, B. Su, T. W. Button, Advanced Engineering Materials(2003), 5 No12

7. K. M. Coakley and M. D. McGehee, Chem. Mater. (2004), 16, 4533-4542

8. C. W. Tang, Appl. Phys. Lett. (1986), 48, 183.