Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3873
標題: 側鏈含芳香胺之聚噻吩共軛高分子之合成及太 陽能電池應用與光電性質探討
Novel Polythiophene-Based Conjugated Copolymers comprising Aromatic Amine Pendants for Photovoltaic Applications
作者: 曾健瑜
Tseng, Jiann-Yu
關鍵字: Triphenylamine
三苯胺
Carbazole
Polymer solar cells
HOMO
Voc
太陽能電池
能階
開路電壓
出版社: 化學工程學系所
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摘要: 本研究分別選用不同的未取代共軛單元單噻吩 (thiophene, PT),雙噻吩 (bithiophene, PT2) 與不同側基三苯胺 (triphenylamine, TPA),咔唑 (carbazole, Cz) 透過 Stille coupling 共聚反應合成一系列具有低能隙之 P 型共軛高分子。主鏈上導入 2-乙基己基 (2-ethylhexyl) 分枝型烷鏈,增進溶解度和高分子分子量,本研究之共軛高分子皆可溶於一般有機溶劑並具備良好熱穩定性。 本實驗針對共軛高分子 HOMO 能階進行調控,在主鏈分別導入不同側基含三苯胺 (triphenylamine, TPA),咔唑 (carbazole, Cz),能有效調整材料的 HOMO 能階,使共軛高分子 HOMO 能階降低,克服高分子太陽能電池在氧化穩定性與開路電壓的問題,使太陽能電池獲得較佳的開路電壓。高分子主鏈分別選用不同的未取代共軛單元單噻吩 (thiophene, PT),雙噻吩 (bithiophene, PT2) 皆能提供有效自由空間提升與碳球衍生物 PC61BM 的混摻相容性。將材料製成元件後進行光伏特性質量測,觀察材料與 PC61BM 混摻型態顯示,本實驗之共軛高分子與 PC61BM 有著很好的相容性,形成均勻奈米尺度微相分離,有利於激子之拆離,因此獲得不錯的短路電流,助於增加元件之光電轉換效率。 由我們的結果表現,主鏈含雙噻吩未取代單元且側鏈含三苯胺之共軛高分子 tEHPT2TPA 與 PC61BM 1:1 (w/w) 混摻之太陽能電池開路電壓為 0.69 V,短路電流為 8.78 mA/cm2,光電轉換效率為 1.94 %。因此,噻吩與側鏈含三苯胺衍生物之 P 型共軛高分子,對未來太陽能電池有很好的發展潛力及應用。
A new series of low-band gap of P-type conjugated polymers containing pendant triphenylamines and carbazole were synthesized via Stille coupling reactions. The introduction of 2-ethylhexyl groups as side chains increased the polymer solubility and high molecular weight. All polymers exhibited good solubility in common organic solvents, and stable thermal properties. Moreover, further introduction of triphenylamines and carbazoles as side chains would broaden the absorption of solar spectra and modulate the HOMO levels of polymers, and resulted in much better oxidative stability. We were able to lower HOMO levels and increased the polymer open circuit voltage (Voc). Consequently, a larger open circuit voltage was acquired. Due to the fact that the incorporation of unsubstituted conjugated moieties in the polymer backbones could provide sufficient free volume, much better miscibility of bulk heterojunction was observed. All polymers exhibited good miscibility with PC61BM, which provided more chances for exciton dissociation. Thus a higher short-circuit current ( Jsc ) was obtained. The best performance was achieved in the following : a power conversion efficiency of 1.94 % and a Voc of 0.69 V, Jsc 8.78 mA/cm2 under illumination of AM 1.5, 100 mW/cm2. This finding suggests that the polythiophene derivative comprising pendants bulky steric groups as side chains are potentially useful for solar cell applications.
URI: http://hdl.handle.net/11455/3873
其他識別: U0005-0808201116191500
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