Novel Alternating Dioctyloxyphenylene Vinylene-Benzothiadiazole Copolymer: Synthesis and Photovoltaic Performance

✍ Scribed by Shengli Lu; Mujie Yang; Jie Luo; Yong Cao; Fenglian Bai

• Book ID: 102485023
• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 162 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200400487

✦ Synopsis

Abstract

Summary: A novel alternating conjugated copolymer (poly[(dioctyloxyphenylene vinylene)‐alt‐(2,1,3‐benzothiadiazole)], C8‐PPV‐BT) consisting of electron‐rich dioctyloxybenzene and electron‐deficient 2,1,3‐benzothiadiazole repeat units was synthesized via a Pd‐catalyzed Heck cross‐coupling polycondensation. The thermal, electrochemical, optical properties, and photophysics of C8‐PPV‐BT blended with [6,6]‐phenyl‐C~61~‐butyric acid methyl ester (PCBM) have been investigated. Photovoltaic devices of ITO/PEDOT‐PSS/C8‐PPV‐BT + PCBM (1/4, w/w)/Ba/Al were fabricated and their photovoltaic parameters were measured. The results showed the energy conversion efficiency (η~e~) and external quantum efficiency (EQE) were 0.335 and 11.7% (451 nm), respectively, under simulated solar light illumination having light intensity of 78.2 mW · (cm^2^)^−1^ (AM1.5), which were both higher than those of devices based on poly[(dioctyloxyphenylene ethynylene)‐alt‐(2,1,3‐benzothiadiazole)] (C8‐PPE‐BT) and PCBM blend under the same conditions. Optical, electrochemical, and photovoltaic properties of C8‐PPV‐BT and C8‐PPE‐BT copolymers were also compared and discussed.
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