Benzo[1,2-b:4,5-b鈥瞉difuran-Based Donor鈥揂cceptor Copolymers for Polymer Solar Cells

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• 作者：Bo Liu ; Xuewen Chen ; Yingping Zou ; Lu Xiao ; Xinjun Xu ; Yuehui He ; Lidong Li ; Yongfang Li
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：September 11, 2012
• 年：2012
• 卷：45
• 期：17
• 页码：6898-6905
• 全文大小：561K
• 年卷期：v.45,no.17(September 11, 2012)
• ISSN：1520-5835

文摘

Three new benzo[1,2-b:4,5-b鈥瞉difuran-based donor鈥揳cceptor conjugated polymers, namely poly{4,8-bis(2鈥?ethylhexyloxy)benzo[1,2-b;3,4-b鈥瞉difuran-alt-5,5-(4鈥?7鈥?di-2-thienyl-5鈥?6鈥?dioctyloxy-2鈥?1鈥?3鈥?benzothiadiazole)}(PBDFDODTBT), poly{4,8-bis(2鈥?ethylhexyloxy)benzo[1,2-b;3,4-b鈥瞉difuran-alt-5,5-(4鈥?7鈥?di-2-thienyl-2-octyl-2鈥?1鈥?3鈥?benzotriazole)}(PBDFDTBTz), poly{4,8-bis(2鈥? ethylhexyloxy)benzo[1,2-b;3,4-b鈥瞉difuran-alt-5,5-(4鈥?7鈥?di-2-thienyl-5鈥?6鈥?dioctyloxy-benzo[c][1,2,5]oxadiazole)}(PBDFDTBO), were synthesized by Stille coupling polymerization reactions. All of the polymers were found to be soluble in common organic solvents such as chloroform, tetrahydrofuran and chlorobenzene with excellent film forming properties. Their structures were verified by ¹H NMR and elemental analysis, the molecular weights were determined by gel permeation chromatography (GPC) and the thermal properties were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The polymer films exhibited broad absorption bands. The hole mobility of PBDFDODTBT:PC₇₁BM (1:2, w/w) blend reached up to 6.7 脳 10^鈥? cm²路V^鈥?路s^鈥? by the space-charge-limited current (SCLC) method. Preliminary photovoltaic cells based on the device structure of ITO/PEDOT:PSS/PBDFDODTBT:PC₇₁BM(1:2, w/w)/Ca/Al showed an open-circuit voltage of 0.69 V, a power conversion efficiency of 4.5% and a short circuit current of 9.87 mA路cm^鈥?.