藉由小分子摻雜與具奈米結構之陰極以提升有機太陽能電池之效能

由於多數能源的存量非常地有限，包含石油、煤碳及天然氣均有用盡的一天，發展再生能源是極為重要的工作。有機太陽能電池具有非常多的優點，是指日可待之能量來源。優點如：成本低廉、可大面積製作、及可製作在可撓性基板上。然而，目前有機太陽能電池之元件效率不如無機太陽能電池之元件效率。本論文旨在引入奈米結構電極與摻雜之方法，希望可以提升有機太陽能電池之效率。　　本研究第一個部分是透過摻雜小分子有機材料TES-ADT在主動層材料內，透過TES-ADT高載子遷移率及好的結晶性，並透過摻雜不同TES-ADT之濃度以最佳化有機太陽能電池的光電轉換效率。經由實驗結果得知，在最佳摻雜比例之下(5 %)，除了薄膜之結晶性及薄膜吸收光譜有效地被改善之外，且主動層材料摻雜TES-ADT之元件效率可從1.38 % 提升至2.70 % ，短路電流密度可從6.46 mA/cm2 提升至9.23 mA/cm2，電洞遷移率也因TES-ADT的摻雜而提升。本研究第二個部分是引入奈米結構於陰極電極上以提升散射光，更進而提升光吸收量與光電流。透過將PS奈米球均勻分布地成長在主動層薄膜上再蒸鍍陰極鋁，即可簡便的透過PS奈米球改變陰極鋁的幾何結構。由實驗結果得知，具有奈米結構元件的吸收光譜可大幅提升，且散射光的增強使得光程變長，元件效率從2.79 % 提升至3.35 % (提升20.07 %)，短路電流密度從9.47 mA/cm2提升至14.18 mA/cm2。

關鍵字

有機半導體；有機太陽能電池； PS奈米球； 5 11-雙(三乙基矽烷基乙炔基)雙噻吩蒽

並列摘要

The development of renewable energy is important because current energy source, such as fossil fuel, coal and nature gas will be ultimately exhausted. Organic solar cells have many advantages, such as low cost and large-area fabrication on flexible substrate. However, the power conversion efficiency of organic solar cells is inferior to the one of inorganic solar cells. The aim of this work is to enhance the efficiency through introducing nanostructure and doping in organic solar cells. The first part of this work is to blend small molecule TES-ADT in photoactive layer, trying to increase carrier mobility, crystallinity and efficiency. According to our results, it demonstrated that, through optimizing the doping concentration of TES-ADT (5%), the carrier mobility, crystallinity and device efficiency can be increased. The efficiency can be increased from 1.38% to 2.71%. The short-circuit current density can be increased from 6.46 mA/cm2 to 9.23 mA/cm2. The second part of this work is to realize nanostructured cathode for light scattering, which can increase optical path and light absorption. Through depositing aluminum on non-close-packed polystyrene sphere array, the nanostructured cathode can be easily fabricated. According to the dark-field optical microscope image, the nanostructured cathode indeed enhanced the light scattering. The device with nanostructured cathode shows higher absorption and evviciency. The efficiency can be increased from 2.79 % to 3.35 %. The short-circuit current density can be increased from 9.47 mA/cm2 to 14.18 mA/cm2.

並列關鍵字

OPV ； Organic solar cells ； Organic semiconductors ； PS Spheres ； TES-ADT

參考文獻

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藉由小分子摻雜與具奈米結構之陰極以提升有機太陽能電池之效能

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