Quinoxaline based new polymers with differenet carrier mobility by side-chain effects for non-fullerene organic solar cells
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초록
내용
Three new BDT-alt-di(thiophen-2-yl) quinoxaline polymers were prepared with the aim of exploring thiophen difluoroquinoxaline (TFQ)-based polymers on fullerene-free organic solar cells (OSCs). The electron-rich BDT unit contains three different substituents, namely BDTO, BDTT, and BDTS. These were polymerized with electron deficient (Dibromo TFQ) to afford the polymers P(BDTO-TFQ), P(BDTT-TFQ), and P(BDTS-TFQ). The OSCs made with a blend of polymer and ITIC gave the maximum power-conversion efficiencies (PCEs) of 3.49, 7.06, and 0.75%, respectively. Overall, the substituents attached at the 4- and 8-positions of the BDT unit of the TFQ-based polymers were found to exhibit greatly altered properties, mobility. This resulted in dissimilar photovoltaic performance for the resulting polymers.