3,6-Carbazole Incorporated into Poly[9,9-dioctylfluorene-alt-(bisthienyl)benzothiadiazole]s Improving the Power Conversion Efficiency

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• 作者：Yuanhe Fu ; Hyojung Cha ; Gang-Young Lee ; Byung Joon Moon ; Chan Eon Park ; Taiho Park
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：April 10, 2012
• 年：2012
• 卷：45
• 期：7
• 页码：3004-3009
• 全文大小：423K
• 年卷期：v.45,no.7(April 10, 2012)
• ISSN：1520-5835

文摘

A novel concept of D鈥揂-type copolymers based on fluorene polymer incorporated with 3,6-carbazole unit enhances the device performance for organic photovoltaic cells. P(F₄₅C₅-DTBT), incorporating 5 mol % 3,6-carbazole into P(2,7F-DTBT), shows an almost 2-fold improvement (5.1%) in power conversion efficiency relative to P(2,7F-DTBT) (2.6%). This results is ascribed to the good balance between electron and hole mobilities in the devices (渭_e/渭_h 1.8 for P(F₄₅C₅-DTBT) vs 152 for P(2,7F-DTBT)), and the formation of a nanoscale morphology in the blend of the copolymer and [6,6]-phenyl C71-butyric acid methyl ester (PC₇₁BM).