Synthesis and photovoltaic properties of new conjugated polymers based on syn- and anti-benzodifuran
Synthesis and photovoltaic properties of new conjugated polymers based on syn- and anti-benzodifuran
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DOI：
10.1039/c2py20504a
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发表时间：
2012-08
影响因子：
4.6
通讯作者：
Chao Hu;Yingying Fu;Shugang Li;Zhiyuan Xie;Qing Zhang
中科院分区：
文献类型：
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作者：
Chao Hu;Yingying Fu;Shugang Li;Zhiyuan Xie;Qing Zhang
以苯并[1，2-B：5，4-B′]二呋喃（syn-BDF）或苯并[1，2-B：5，4-B′]二呋喃（anti-BDF）为给体，异靛为受体，通过Stille交叉偶联反应合成了给体-受体共轭聚合物。研究了顺式和反式重复单元对聚合物光学、电化学和光伏性能的影响。反PBDFID比顺式PBDFID具有更低的光学带隙和更高的HOMO能级。顺式PBDFID比反式PBDFID具有更好的溶解性。并与苯并[1，2-B：4，5-B′]二噻吩（BDTs）类聚合物的能级进行了比较。结果表明，利用syn-BDF等共轭程度较低的重复单元，消除BDF中心苯环上的给电子基团，可以有效降低聚合物的HOMO能级。syn-PBDFID的低HOMO能级使得PSC器件中的开路电压高。
Donor–acceptor conjugated polymers based on benzo[1,2-b:5,4-b′]difuran (syn-BDF) or benzo[1,2-b:5,4-b′]difuran (anti-BDF) as donors and isoindigo as acceptors were synthesized by Stille cross-coupling reaction. The effects of syn- and anti-repeating units on optical, electrochemical and photovoltaic properties of polymers were investigated. The anti-PBDFID displayed lower optical bandgap and higher HOMO energy level than syn-PBDFID. The syn-PBDFID had better solubility than anti-PBDFID. The energy levels of two new polymers were compared with some related benzo[1,2-b:4,5-b′]dithiophenes (BDTs) based polymers. The results suggested that the utilization of less conjugated repeating units such as syn-BDF and the elimination of electron donating groups on the central phenyl ring of BDF can effectively lower the HOMO energy level of polymer. The low HOMO energy level of syn-PBDFID enabled high open circuit voltages in PSC devices.