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標題: | 利用乙氧基聚乙烯亞胺陰極介面層與石墨烯陰極製備倒置型有機太陽能電池及其元件特性分析 Fabrications and device characterizations of inverted organic solar cells using polyethylenimine ethoxylated cathode interlayers and graphene cathodes |
作者: | Chih-Ting Yeh 葉治鼎 |
指導教授: | 吳志毅(Chih-I Wu) |
關鍵字: | 有機太陽能電池,倒置結構,乙氧基聚乙烯亞胺陰極介面層,石墨烯陰極, organic solar cells,inverted structure,polyethylenimine ethoxylated (PEIE) cathode interlayer,graphene cathode, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 本篇論文以乙氧基聚乙烯亞胺(PEIE)陰極介面層和石墨烯陰極製備本體異質接面有機太陽能電池,並探討其電池特性。
本篇論文皆以倒置型結構、P3HT:ICBA為主動層製備太陽能電池。首先,針對PEIE陰極介面層進行最佳化,經過實驗測試元件效率提升至5.23%,而PEIE使ITO的功函數下降為最主要原因,讓ITO更適合當作陰極製備倒置型元件。接下來,將AZO加入元件結構中,利用PEIE調控功函數以及使其與主動層的接面更加平整,效率來到最佳的5.72%。其中,透過UPS量測可清楚看到PEIE使介面功函數下降的結果,而AFM則可了解PEIE對於表面型態的影響。 接著本論文利用石墨烯為陰極取代ITO製備太陽能電池,石墨烯元件在製程上較為複雜,利用PMMA方法轉印三層氟化銫(CsF)層間參雜之石墨烯後,尚須利用氧電漿轟擊石墨烯表面方能進行後續的製程。CsF參雜後使得石墨烯功函數下降,對於石墨烯當作陰極更加有利;而受到石墨烯本質疏水性的限制,氧電漿則用來增加石墨烯的親水性,提升接下來的溶劑式製程薄膜的品質。最終,石墨烯陰極元件的效率來到了3.22%,與ITO陰極的元件仍有不小的差距,過高的片電阻值以及親水性不足是兩個最重要的原因。但即使如此,在石墨烯製程尚未成熟的情況下,些許的突破仍然令人鼓舞,增加日後廣泛使用的可能性。 In this study, we fabricate bulk heterojunction organic solar cells with polyethylenimine ethoxylated (PEIE) cathode interlayers and graphene cathodes. The performance of solar cells is systematically investigated. The solar cells investigated in this thesis are fabricated in inverted structures with P3HT:ICBA as the active layer. First, we optimize the PEIE cathode interlayer, and the efficiency can reach 5.23% after optimization. The PEIE layer lowers the ITO work function (WF) , and can be used as a cathode . Then, the AZO layer is introduced in the devices along with PEIE to modify the WF and make the active layer junction smoother and the PCE achieves 5.72%. UPS measurements on PEIE-coated ITO or AZO film show the consequence of WF modification. AFM measurements were also carried out to figure out the morphology of these layers. In addition, we fabricate solar cells using graphene as cathodes. We transfer three layer graphene with cesium fluoride (CsF) interlayer doping to make the graphene WF lower and is more favorable as cathodes. Due to graphene’s hydrophobic nature, we use oxygen plasma treatment to improve the hydrophilicity of graphene. After this treatment, the follow-up AZO film quality can be enhanced. The PCE of graphene-cathode solar cell is 3.22%, which is still a little bit lower than that of ITO-based device. The high sheet resistance and the inadequate hydrophilicity are the two main reasons for the low PCE of the graphene solar cells. However, these works still make the graphene as cathodes realized for the first time. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57065 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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