The Side-Chain Effects on Photovoltaic Properties of Copolymers Based on Phenothiazine and Thiophene

Abstract:

In this study, the alternating conductive polymers based on phenothiazine and bithiophene unit, poly[(N-10-dodecyl-phenothiazin-3,7-ylene)-alt-(2,2’-bithiophen-5-yl)] (P1) and poly[(N-10- dodecyl-phenothiazin-3,7-ylene)-alt-(4,4’-didodecyl-2,2’-bithiophen-5-yl)] (P2), were synthesized by Suzuki coupling reaction in the presence of palladium catalyst. The structures of synthesized compounds were confirmed by 1H NMR. The optical, electrochemical properties of synthesized polymers were investigated by UV-Vis, cyclic voltammetry (CV). The optical band gap of 2.22 eV and 2.50 eV was obtained from absorption onset of UV-Vis spectrum. Then, the two devices using blends of the polymer, as a donor, and PC71BM, as an acceptor, were fabricated by spin-coating. The device with a P1:PC71BM (1:4, w/w) as an active layer exhibited the best performance with an open circuit voltage (VOC) of 0.68 V, short circuit current (JSC) of 3.5 mA/cm2, fill factor (FF) of 31.8 % and power conversion efficiency (PCE) of 0.74 %.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2621-2628
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2621
• Online since: January 2013
• Authors: Han Sol Yoo, Dae Hee Yun, Tae Won Ko, Yong Sung Park, Je Wan Woo
• Keywords: Conducting Polymer, Phenothiazine Derivatives, Photovoltaics, Thiophene Derivatives

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