Narrow-Band-Gap Conjugated Polymers Based on 2,7-Dioctyl-Substituted Dibenzo[a,c]phenazine Derivatives for Polymer Solar Cells

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• 作者：Ruifeng He ; Lei Yu ; Ping Cai ; Feng Peng ; Jin Xu ; Lei Ying ; Junwu Chen ; Wei Yang ; Yong Cao
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：May 13, 2014
• 年：2014
• 卷：47
• 期：9
• 页码：2921-2928
• 全文大小：485K
• 年卷期：v.47,no.9(May 13, 2014)
• ISSN：1520-5835

文摘

A series of new 2,7-dioctyl-substituted dibenzo[a,c]phenazine (BPz) derivatives were designed and synthesized as electron-deficient units, which were copolymerized with an electron-rich indacenodithiophene (IDT) to construct narrow-band-gap copolymers PIDT鈥揙HBPz, PIDT鈥揙FBPz, and PIDT鈥揙BPQ via Stille polycondensation. The 2,7-dioctyl substituents enhanced solubility and offered a new approach for developing various BPz derivatives. All copolymers showed high hole mobilities above 0.01 cm² V^鈥? s^鈥? as measured by field effect transistors. The best performance of polymer solar cell was achieved based on PIDT鈥揙FBPz with inverted device structure of ITO/ZnO/PFN/polymer:PC₆₁BM/MoO₃/Al, which showed an open-circuit voltage (V_oc) of 0.97 V, a short-circuit current (J_sc) of 8.96 mA/cm², and a fill factor (FF) of 58.99%, leading to a high power conversion efficiency (PCE) of 5.13%. These results indicate that 2,7-alkyl-substituted BPz derivatives can be used as an excellent electron-deficient building block for the construction of high-performance organic electronic materials.