Thieno[3,4-c]pyrrole-4,6-dione-Based Donor鈭扐cceptor Conjugated Polymers for Solar Cells

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• 作者：Xugang Guo ; Hao Xin ; Felix Sunjoo Kim ; Arawwawala D. T. Liyanage ; Samson A. Jenekhe ; Mark D. Watson
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：January 25, 2011
• 年：2011
• 卷：44
• 期：2
• 页码：269-277
• 全文大小：1072K
• 年卷期：v.44,no.2(January 25, 2011)
• ISSN：1520-5835

文摘

Three new donor鈭抋cceptor conjugated polymers incorporating thieno[3,4-c]pyrrole-4,6-dione (TPD) acceptor and dialkoxybithiophene or cyclopentadithiophene units as donor have been synthesized and explored in bulk heterojunction (BHJ) solar cells and organic field-effect transistors (OFETs). The TPD-containing polymers had optical band gaps of 1.50鈭?.70 eV and HOMO levels of 鈭?.85 to 鈭?.26 eV. The highly electron-rich character of dialkoxybithiophene in P1 and P2 destabilizes their HOMOs which significantly affects the photovoltaic efficiency. However, polymer P3 containing cyclopentadithiophene donor units results in a deeper HOMO level of 鈭?.26 eV. The field-effect mobility of holes varied from 2 脳 10^鈭? cm²/(V s) in P2 to 1 脳 10^鈭? cm²/(V s) in P3-based transistors. BHJ solar cells using polymer P1 or P2 as the electron donor and (6,6)-phenyl-C₇₁-butyric acid ester (PC₇₁BM) as the electron acceptor exhibit low open circuit voltages (V_oc = 0.40鈭?.60 V) and power conversion efficiencies below 1.5%. However, BHJ solar cells based on the TPD鈭抍yclopentadithiophene copolymer (P3) achieved a high V_oc of 0.8 V and power conversation efficiency greater than 3%. These results demonstrate the tuning of the open circuit voltage and thus the photovoltaic efficiency of BHJ solar cells based on copolymers containing thieno[3,4-c]pyrrole-4,6-dione acceptor.