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[[abstract]]In this thesis, we investigated that quasi-one-dimensional nanomaterials of single-walled carbon nanotubes (SWCNTs) and boron-nitride nanotubes(BNNTs) been used to enhance the photovoltaic performance and device lifetime in an organic photovoltaic (OPV) cells, respectively. In the first task, we fabricated and characterized OPV devices with hybrid composite anodes containing SWCNT networks sandwiched between ITO and PEDOT:PSS. We found that Voc of our OPV devices was insensitive to SWCNTs’ work function shifting caused by the employed chemical treatments, while Jsc and PCE both increased in the order of : reference devices < devices with pristine SWCNT networks < devices with H2SO4/HNO3-treated SWCNT networks < cells with N2H4-treated SWCNT networks. Compared to reference devices, Jsc and PCE of devices with N2H4-treat...
[[abstract]]奈米碳管於1991年發現以來,已經被證實具有多種獨特的材料性質,因此也被應用在許多的領域,然而如何控制奈米碳管之定位、定向及定量的成長,至今仍是奈米碳管於實際應用上的一個瓶頸。回顧過去文獻,已經有許多控制成長的方法被提出,但仍然無法提供一高良率且製程簡易之方法。因此探討奈米碳管控制成長之方法及其機制,是本論文的研究主題。 本論文提出三種定位成長奈米碳管的方法 : (1)引洞成長(CNTs growth in holes) (2)旋塗催化微粒(spin-on iron catalysts) (3)舉離法(lift-off method)。並以thermal CVD及MPCVD成長奈米碳管,探討電漿功率、成長溫度及碳源比例等參數,對奈米碳管結構及定位成長之影響。由實驗結果分析,引洞成長奈米碳管並以電子束鄰近效應縮小孔徑至0.1μm,可提高孔洞內成長單根奈米碳管之良率。此外,比較三種定位成長奈米碳管的方法,以舉離法可以定位成長高準直性且良率較高之單根奈米碳管。 而在定向成長奈米碳管的研究上,利用MPCVD之電漿鞘層所產生的自我偏壓,形成一個方向性的電場,而此電場主宰著奈米碳管成長的方向,利用此一機制可以控制奈米碳管具有方向性之成長。此外,經由實驗結果分析,在MPCVD成長奈米碳管的實驗,增加微波電漿功率可使奈米碳管的準直性及石墨化程度提高,並有較佳之場發射特性。 !!
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