Syntheses and Characterization of Benzimidazole Derivatives Based Conjugated Polymers for Organic Solar Cells
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Recently, polymer solar cells (PSC) drew great recognition and became a promising photovoltaic technique because of its remarkable advantages such as low cost, good flexibility, lightweight and can be processed easily in large area.[1] Despite of those advantages, polymer solar cells still have rather low efficiency but it is still usable because of its low cost process. In this research, we designed a new electron donor-acceptor conjugated polymers using benzimidazole derivatives with different electron-deficient ability and applied for PSC. The synthesized polymers composed of electron-rich group thienylthienoindole (TTI) for organic solar cells. The TTI and benzimidazole were coupled using Stille polymerization. We synthesized new polymers named HS-5618, HS-5611 and HS-5616. The device composed of HS-5611 showed a VOC of 0.7 V, a JSC of 9.16 mA/cm2, and a FF of 0.43, giving a PCE of 2.84%. [1] Su, Y.-W; Lan, S.-C.; Wei, K.-H. Organic photovoltaics. Mater. Today, 2012, 15, 554-562.