氟硼二吡咯高分子於有機光電池之應用

BODIPY-containing polymers for OPV application

歐思晨(Shi-Chen Ou)

指導教授 ： 邱靜雯

國立臺灣大學/理學院/化學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.02484

摘要

因具有特殊的光電性質，含硼化合物在各方面都有相當多的研究。近年來發表了許多使用具有化學及熱穩定性的氟硼二吡咯衍生物作為太陽能電池材料的文獻。儘管氟硼二吡咯衍生物在染料敏化太陽能電池領域得到了相當不錯的結果，在異質接面太陽能電池上的應用仍不理想。藉由與BDT連接，我們合成了一系列的BODIPY-BDT低能隙共軛高分子，並將其應用於有機光伏打。有趣的是，雖然這系列材料具有相近的光學性質，但在太陽能電池的表現上卻有相當大的差異。使用BODIPY(Ph)-BDT/PC71BM做為主動層的元件達到了1.55 % 的效率。薄膜形態學上的研究結果顯示meso位置的芳香取代基與BODIPY的兩面角會限制材料的堆疊並影響元件表現。

關鍵字

有機光伏打 ； 氟硼二吡咯 ； 太陽能電池 ； 異質接面太陽能電池

並列摘要

Boron derivatives have found numerous applications for their intriguing optoelectronic properties. Recently, solar cells containing the chemically and thermally stable boron-dipyrromethene (BODIPY) have also been reported. Although successes of BODIPYs in dye-sensitized solar cell (DSSC) were achieved, studies on BOIDPY-containing polymers in bulk-heterojunction solar cell (BHJ) were relatively scarce. By connecting with 4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)benzo[1,2-b:4,5-b’] dithiophene donor (BDT), a series of BODIPY-BDT low band gap conjugating polymers were synthesized and evaluated for organic photovoltaic applications. Interestingly, although the optical properties of these polymers are similar, significant discrepancies in OPV performance are observed. A power conversion efficiency (PCE) of 1.55 % was achieved with the BODIPY(Ph)-BDT/PC71BM device. Further investigation on the thin-film morphology suggested that large dihedral angle between the meso-aryl group and BODIPY core decrease the crystallinity of the active layer and leads to low PCE value.

並列關鍵字

organic photovoltaic ； BODIPY ； solar cell ； bulk heterojunction solar cell

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