Donor Polymers Containing Benzothiadiazole and Four Thiophene Rings in Their Repeating Units with Improved Photovoltaic Performance
Donor Polymers Containing Benzothiadiazole and Four Thiophene Rings in Their Repeating Units with Improved Photovoltaic Performance
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DOI：
10.1021/ma900601y
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发表时间：
2009-05
期刊：
影响因子：
5.5
通讯作者：
Ergang Wang;Ming Wang;Li Wang;Chunhui Duan;Jie Zhang;Wanzhu Cai;Chao He;Hongbin Wu;Yong Cao
中科院分区：
文献类型：
--
作者：
Ergang Wang;Ming Wang;Li Wang;Chunhui Duan;Jie Zhang;Wanzhu Cai;Chao He;Hongbin Wu;Yong Cao
合成并表征了一系列含苯并噻二唑和四个噻吩环（双（2，2 ′-二噻吩基）苯并噻二唑）的内给体-受体型共聚物。研究了烷基在不同噻吩环上的位置对其光学、电化学和光伏性能的影响，并与聚（2，7-（9，9-二辛基芴）-alt-5，5-（4′，7 ′-二-2-噻吩基苯并[c][1，2，5]噻二唑））（PFO-DBT）进行了比较.一种新的聚合物，聚（2，7-（9，9-二辛基芴）-alt-5′，5 ′-（4，7-双（3′-己基-2，2 ′-联噻吩-5-基）苯并[c][1，2，5]噻二唑））（PFO-M3）显示出最好的器件性能，其功率转换效率为2.63%，开路电压为0.86 V，短路电流密度为5.86 mA cm-2，填充因子为0.52，与PFO-DBT相比更好。这项工作表明，增加给体-受体聚合物重复单元中噻吩环的数量是一种简单而有效的方法。
A series of internal donor−acceptor type of copolymers containing benzothiadiazole and four thiophene rings (bis(2,2′-dithienyl)benzothiadiazole) in their repeating units were synthesized and characterized. The effect of the position of alkyl groups attached to different thiophene rings of the new polymers on their optical, electrochemical, and photovoltaic properties was investigated and compared with poly(2,7-(9,9-dioctylfluorene)-alt-5,5-(4′,7′-di-2-thienylbenzo[c][1,2,5]thiadiazole)) (PFO-DBT). One of the new polymers, poly(2,7-(9,9-dioctylfluorene)-alt-5′,5′-(4,7-bis(3′-hexyl-2,2′-bithiophen-5-yl)benzo[c][1,2,5]thiadiazole)) (PFO-M3), showed the best device performance with a power-conversion efficiency of 2.63%, an open-circuit voltage of 0.86 V, a short-circuit current density of 5.86 mA cm−2 and a fill factor of 0.52, which is better as compared with PFO-DBT. This work demonstrated that increasing the number of thiophene rings in the repeating units of the donor−acceptor polymers is a simple and e...