Fine Structural Tuning of Cyanated Dithieno[3,2-b:2鈥?3鈥?d]silole鈥揙ligothiophene Copolymers: Synthesis, Characterization, and Photovoltaic Response

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• 作者：Mirko Seri ; Margherita Bolognesi ; Zhihua Chen ; Shaofeng Lu ; Wouter Koopman ; Antonio Facchetti ; Michele Muccini
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：August 27, 2013
• 年：2013
• 卷：46
• 期：16
• 页码：6419-6430
• 全文大小：690K
• 年卷期：v.46,no.16(August 27, 2013)
• ISSN：1520-5835

文摘

We report here the synthesis and characterization of a new series of semiconducting polymers based on dithieno[3,2-b:2鈥?3鈥?d]silole (SiDT) copolymerized with cyanated oligothiophenes (-2T- or -4T-) units. The effect of the fine structural tuning of the thiophene-based spacer on optical, electronic, morphological, and photophysical properties of the resulting polymers is investigated and correlated with the organic photovoltaic (OPV) performance. Bulk heterojunction (BHJ) solar cells, using this class of copolymers as electron donor material, are fabricated, optimized, and fully characterized. As a result of rational structural modifications, PCEs of 5% and open-circuit voltages (V_OC) greater than 0.8 V are achieved without the need of additional thermal annealing.