Synthesis of thieno[3,4-d]thiazole-based conjugated polymers and HOMO level tuning for high VOC photovoltaic cell
Synthesis of thieno[3,4-d]thiazole-based conjugated polymers and HOMO level tuning for high VOC photovoltaic cell
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DOI：
10.1016/j.orgel.2012.04.009
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发表时间：
2012-08
影响因子：
3.2
通讯作者：
Jea Woong Jo;S. Kim;W. Jo
中科院分区：
文献类型：
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作者：
Jea Woong Jo;S. Kim;W. Jo
通过新的合成路线合成了一种电子接受结构单元噻吩并[3,4-d]噻唑（TTz）。当它与供电子芴、咔唑或苯并二噻吩衍生物通过偶联反应交替共聚时，三种共聚物的最低占据分子轨道能级均在-3.55eV左右，而共聚物的最高占据分子轨道（HOMO）能级取决于共聚物中给电子单元的给电子能力。当芴衍生物（最弱的给电子单元）被用作给电子结构单元时，共聚物表现出最低的HOMO能量。由TTz和芴衍生物组成的交替共聚物表现出0.91eV的高VOC，因为弱给电子芴降低了交替共聚物的HOMO能级。
An electron-accepting building block, thieno[3,4-d]thiazole (TTz) was synthesized through a new synthetic route. When it was alternatively copolymerized with electron-donating fluorene, carbazole, or benzodithiophene derivatives via coupling reaction, all of the three copolymers had the low-lying lowest occupied molecular orbital energy levels around −3.55eV, while the highest occupied molecular orbital (HOMO) energy level of the copolymer was dependent upon the electron-donating ability of electron-donating unit in the copolymer. When a fluorene derivative, the weakest electron-donating unit, was used as electron-donating building block, the copolymer showed the lowest HOMO energy. The alternating copolymer composed of TTz and fluorene derivative exhibits a high VOCof 0.91eV, because a weak electron-donating fluorene lowers the HOMO level of the alternating copolymer.