Synthesis, Characterization, and Photovoltaic Properties of Novel Semiconducting Polymers with Thiophene−Phenylene−Thiophene (TPT) as Coplanar Units

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• 作者：Shu-Hua Chan ; Chih-Ping Chen ; Teng-Chih Chao ; Ching Ting ; Chin-Sheng Lin ; Bao-Tsan Ko
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：August 12, 2008
• 年：2008
• 卷：41
• 期：15
• 页码：5519-5526
• 全文大小：363K
• 年卷期：v.41,no.15(August 12, 2008)
• ISSN：1520-5835

文摘

Four novel conjugated polymers (P1, P2, P3, and P4) based on coplanar thiophene−phenylene−thiophene (TPT) derivatives have been designed and synthesized for application in polymer solar cells (PSCs). The optical, electrochemical, field effect carrier mobility, and photovoltaic properties of P1−P4 are investigated and compared with those of poly(3-hexylthiophene) (P3HT). PSCs are fabricated based on the blend of the polymers and [6,6]-phenyl-C61-butyric acid methyl ester (PC₆₁BM) or 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-C-71 (PC₇₁BM) with a weight ratio of 1:3. The maximum power conversion efficiency (PCE) of the PSCs based on P3/PC₇₁BM system reaches 3.3% with a short circuit current density (J_sc) of 7.6 mA/cm², an open circuit voltage (V_oc) of 0.8 V, and a fill factor (FF) of 0.54 under AM 1.5G (100 mW/cm²) illumination. The results indicate that the coplanar TPT conjugated derivatives are promising PSC materials.