The enhanced photovoltaic performance of fluorinated acenaphtho[1,2-b]quinoxaline based low band gap polymer
The enhanced photovoltaic performance of fluorinated acenaphtho[1,2-b]quinoxaline based low band gap polymer
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DOI：
10.1016/j.polymer.2015.06.049
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发表时间：
2015-08
期刊：
影响因子：
4.6
通讯作者：
Tao Fang;Zhen Lu;Heng Lu;Cuihong Li;Guangwu Li;Chong Kang;Zhishan Bo
中科院分区：
文献类型：
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作者：
Tao Fang;Zhen Lu;Heng Lu;Cuihong Li;Guangwu Li;Chong Kang;Zhishan Bo
设计并合成了一种以含氟苊并[1，2-B]喹喔啉（AQ）为受体单元，苯并[1，2-B：4，5-B′]二噻吩为给体单元的新型低带隙聚合物P1。与其非氟化类似聚合物P2相比，P1显示出1.76 eV的较低带隙和-5.54 eV的较深HOMO能级。以P1和PC 71 BM的共混物作为有源层的聚合物太阳能电池在没有添加剂或退火的情况下显示出4.72%的PCE，这高于基于P2的器件的PCE（1.65%）。显然，P1可以赋予器件0.77 V的aVoc和10.75 mA cm-2的aJsc，高于基于P2的器件0.75 V的aVoc和4.41 mA cm-2的aJsc，这种增强的光伏性能可以归因于更宽的吸收、膜形态的改善和更高的电荷迁移率。因此，氟化AQ可以是构建窄带隙共轭聚合物的有用受体单元。据我们所知，这是AQ基聚合物太阳能电池的最高PCE报告。
A new low band gap polymerP1with fluorinated acenaphtho[1,2-b]quinoxaline (AQ) as the acceptor unit and benzo[1,2-b:4,5-b′]dithiophene as the donor unit has been designed and synthesized. Comparing with its non-fluorinated analog polymerP2,P1shows a lower band gap of 1.76 eV with a deeper HOMO energy level of −5.54 eV. Polymer solar cells with the blend ofP1and PC71BM as the active layer without the additive or annealing showed a PCE of 4.72%, which was higher thanP2based devices with a PCE of 1.65%. Obviously,P1can endow devices with aVocof 0.77 V and aJscof 10.75 mA cm−2, which are higher than that ofP2based devices with aVocof 0.75 V andaJscof 4.41 mA cm−2, such an enhanced photovoltaic performance can be attributed to the broader absorption, the improvement of film morphology, and the higher charge mobility. Thus, fluorinated AQ can be a useful acceptor unit to construct narrow band gap conjugated polymers. To the best of our knowledge, this is the highest PCE report for AQ based polymer solar cells.