Efficient polymer solar cells based on poly(thieno[2,3-f]benzofuran-co-thienopyrroledione) with a high open circuit voltage exceeding 1 V
Efficient polymer solar cells based on poly(thieno[2,3-f]benzofuran-co-thienopyrroledione) with a high open circuit voltage exceeding 1 V
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DOI：
10.1016/j.dyepig.2017.07.057
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发表时间：
2017-11
影响因子：
4.5
通讯作者：
Yueyue Gao;Aziz Saparbaev;Yong Zhang;Renqiang Yang;F. Guo;Yulin Yang;Liancheng Zhao
中科院分区：
文献类型：
--
作者：
Yueyue Gao;Aziz Saparbaev;Yong Zhang;Renqiang Yang;F. Guo;Yulin Yang;Liancheng Zhao
合成了一种新型的基于二维(2D)共轭烷基硫代[2，3-f]苯并呋喃(TBF)和硫代吡咯二酮(TPD)单元的施主-受体型共轭聚合物(PTBFTPD)，并将其应用于体异质结聚合物太阳电池的施主材料。作为对比，还合成了基于烷基亚硫基取代的[2，3-f]苯并噻吩基(BDT)和TPD单元的对应共轭聚合物(PBDTTPD)。对两种聚合物的热性能、光学和电化学性质、能级、分子链取向堆积行为和光伏性能进行了深入的研究。这两种聚合物表现出相似的光学性质。与PBDTTPD相比，PTBFTPD在溶液和薄膜中表现出相似的吸收特性。PTBFTPD的带隙略窄，为1.83 eV，而PBDTTPD的带隙为1.85 eV。PTBFTPD表现出更深的最高占据分子轨道能级(−5.64eV)，比PBDTTPD低0.1eV。X射线衍射研究表明，PTBFTPD比PBDTTPD具有更紧密的π-π堆积。对不同条件下的光伏特性进行了研究，得到了最优的功率转换效率(PCE)为4.33%，开路电压(VOC)高达1.09nV，与相同条件下的PBDTTPD/PC71BM器件相比提高了32%。
A new donor-acceptor type conjugated polymer (PTBFTPD) based on two-dimensional (2D) conjugated alkylthienyl substituted thieno[2,3-f]benzofuran (TBF) and thienopyrroledione (TPD) unit, was synthesized and applied as donor material for bulk heterojunction polymer solar cells. As a comparison, its counterpart conjugated polymer (PBDTTPD) based on alkylthienyl substituted thieno[2,3-f]benzothiophene (BDT) and TPD unit, was also synthesized. The thermal properties, optical and electrochemical properties, energy levels, molecular chain orientation stacking behavior and photovoltaic properties of two polymers were intensively investigated. Both polymers showed similar optical properties. Compared with PBDTTPD, PTBFTPD shown the similar absorption properties in solution and in a thin film. PTBFTPD had a slightly narrow bandgap of 1.83 eV while that of 1.85 eV for PBDTTPD. PTBFTPD displayed a deeper highest occupied molecular orbital (HOMO) energy level of (−5.64 eV), which was 0.1 eV lower than that for PBDTTPD. The XRD study showed that PTBFTPD possessed a closer π-π stacking than PBDTTPD. The photovoltaic properties were investigated under various conditions, the optimized power conversion efficiency (PCE) of 4.33% with an open-circuit voltage (Voc) of as high as 1.09 V were obtained, which resulted in a 32% improvement in comparison with PBDTTPD/PC71BM-based device under the same conditions.