Effect of structural optimization on the photovoltaic performance of dithieno[3,2-b:2',3'-d]pyrrole-based dye-sensitized solar cells
Effect of structural optimization on the photovoltaic performance of dithieno[3,2-b:2',3'-d]pyrrole-based dye-sensitized solar cells
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结构优化对二噻吩并[3,2-b:2-,3-d]吡咯基染料敏化太阳能电池光伏性能的影响
DOI：
10.1039/c7ra05716d
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发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Yan-Ping Hong
中科院分区：
文献类型：
--
作者：
Hai Zhang;Zafar Iqbal;Zhen-E. Chen;Yan-Ping Hong
以咔唑或三苯胺为给体，二噻吩并[3，2-B：2′，3 ′-d]吡咯为间隔基，氰基乙酸为受体，合成了5种新型有机推拉染料DT、CD-T、TD-T、CD-C和TD-P，并对其结构进行了优化。通过Suzuki偶联反应将二噻吩并[3，2-B：2′，3 ′-d]吡咯与咔唑或三苯胺连接。然后通过Vilsmeier-Haak反应进行缩合，再通过Knoevenagel缩合反应连接氰基乙酸，得到咔唑基染料CD-C和CD-T以及三苯胺基染料TD-P和TD-T。同时合成了染料DT作为对比。咔唑基染料CD-T和CD-C的摩尔消光系数分别为56 370 M−1 cm−1和62 471 M−1 cm−1，而三苯胺基染料TD-T和TD-P的摩尔消光系数分别为44 555 M−1 cm−1和49 945 M−1 cm−1。 CD-T的优化功率转换效率达到6.63%，开路电压为710 mV，短路电流密度为14.55 mV cm−2，填充因子为0.64。
Five novel organic push–pull dyes, DT, CD-T, TD-T, CD-C and TD-P, based on carbazole or triphenylamine as donors, dithieno[3,2-b:2′,3′-d]pyrrole as a π-spacer and cyanoacetic acid as an acceptor were synthesized, and their structures were optimized for DSSCs. Dithieno[3,2-b:2′,3′-d]pyrrole was linked with either carbazole or triphenylamine via a Suzuki coupling reaction. Followed by formylation via a Vilsmeier–Haak reaction, and then a Knoevenagel condensation reaction was employed to link cyanoacetic acid, producing the carbazole-based dyes CD-C and CD-T and the triphenylamine-based dyes TD-P and TD-T. Meanwhile, the dye DT was synthesized as a reference for comparison. The molar extinction coefficients of the carbazole-based dyes CD-T and CD-C were 56 370 M−1 cm−1 and 62 471 M−1 cm−1, while those of the dyes based on triphenylamine, TD-T and TD-P, were 44 555 M−1 cm−1 and 49 945 M−1 cm−1, respectively. The optimized power conversion efficiency of CD-T reached 6.63% with an open-circuit voltage of 710 mV, a short-circuit current density of 14.55 mV cm−2, and a fill factor of 0.64.