Conjugated Polymer Consisting of Quinacridone and Benzothiadiazole as Donor Materials for Organic Photovoltaics: Coplanar Property of Polymer Backbone

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• 作者：Ho-Jun Song ; Doo-Hun Kim ; Eui-Jin Lee ; Soo-Won Heo ; Jang-Yong Lee ; Doo-Kyung Moon
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：October 9, 2012
• 年：2012
• 卷：45
• 期：19
• 页码：7815-7822
• 全文大小：600K
• 年卷期：v.45,no.19(October 9, 2012)
• ISSN：1520-5835

文摘

Highly soluble poly[quinacridone-alt-benzothiadiazole] (PQCDTB) has been synthesized through the Suzuki coupling reaction by introducing planar quinacridone and highly absorbing benzothiadiazole. The PQCDTB dissolved in general organic solvents, and the M_n was 49.8 kg/mol. The optical band gap energy was 1.92 eV, which was similar to the band gap of benzothiadiazole. The HOMO and LUMO levels of PQCDTB were 鈭?.24 eV and 鈭?.32 eV, respectively. According to the XRD measurement, PQCDTB showed the formation of ordered lamellar structure as an out-of-plane peak (h00) by the alkyl side chain of quinacridone and conventional edge-on 蟺- stacking. This study also evaluated the OPV characteristics by fabricating a bulk-heterojunction鈥搕ype polymer solar cell. When PQCDTB and PC₇₁BM were fabricated in a 1:1 weight ratio, the open-circuit voltage (V_OC), short-circuit current (J_SC), fill factor (FF), and power conversion efficiency (PCE) were 0.79 V, 5.6 mA cm^鈥?, 55.8% and 2.5%, respectively. In particular, PQCDTB exhibited higher FFs compared with poly[carbazole-alt-benzothiadiazole] (PCZDTB).