Enhanced device performance using quinoxaline-based polymer donors by thiophene bridge engineering for NFA solar cells
발표자
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초록
내용
A series of new alternating polymers, based on electron-rich benzodithiophene (BDT) derivatives, namely butyloctyloxybenzodithiophene (BDTO), butyloctylthiophenbenzodithiophene (BDTT), and triisopropylsilylethynylbenzodithiophene (BDTSi), as well as electron-deficient hexylthiophen-2-yl)thiophendidodecyldifluoroquinoxaline (TTFQ) units were prepared. The various physical and chemical properties of the new polymers were investigated and compared with reported TFQ-based polymers containing BDTO, BDTT, and BDTSi. This study confirmed that the additional π˗bridges between the BDT and TFQ units of new polymers do not critically alter its properties, but do alter the properties of P(BDTSi-TFQ) only. Consequently, the polymers P(BDTO-TTFQ) and P(BDTT-TTFQ) exhibit comparable power conversion efficiencies (3.99% and 6.69%) compared to those of P(BDTO-TFQ) and P(BDTT-TFQ) (3.49% and 7.06%), but P(BDTSi-TTFQ) shows a improved from PCE of 6.21% to 0.75% from P(BDTSi-TFQ)