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首页> 外文期刊>RSC Advances >Design and synthesis of new ultra-low band gap thiadiazoloquinoxaline-based polymers for near-infrared organic photovoltaic application
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Design and synthesis of new ultra-low band gap thiadiazoloquinoxaline-based polymers for near-infrared organic photovoltaic application

机译：近红外有机光伏应用的新型超低频胶质氧喹喔啉基聚合物的设计与合成

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摘要

Two D–A copolymers, F1 and F2 , with fluorene and thiazole units were substituted, respectively, on a thiadiazoloquinoxaline (TDQ) unit to enhance the electron-accepting strength of TDQ. The copolymers were synthesized by a cross-coupling Stille reaction and their optical and electrochemical properties were examined, which revealed that they have ultra-low band gaps and absorption in the near-infrared. These copolymers were employed as donors along with PC _(71) BM as an electron acceptor for the fabrication of solution-processed bulk heterojunction (BHJ) polymer solar cells. After the optimization of the donor-to-acceptor weight ratio and the solvent additive (4 v% DIO as solvent additive), devices with F1 :PC _(71) BM and F2 :PC _(71) BM displayed power conversion efficiencies (PCEs) of 5.80% and 3.32%, respectively. Although F2 possesses a broader absorption profile compared with F1 , the lower value of PCE for the F2 -based device was attributed to the low LUMO offset between F2 and PC _(71) BM, which limited the exciton dissociation. The abovementioned results indicate that these copolymers can be utilized for ternary BHJ and tandem solar cells to achieve a high PCE.
机译：两种D-A共聚物，F1和F2，分别在噻二唑喹喔啉（TDQ）单元上分别取代芴和噻唑单元以增强TDQ的电子接受强度。通过交叉偶联的STILLE反应合成共聚物，并检查它们的光学和电化学性质，显示它们具有超低频带间隙和近红外吸收的吸收。这些共聚物用作供体以及PC _（71）BM作为制造溶液加工的本体异质结（BHJ）聚合物太阳能电池的电子受体。优化供体 - 受体重量比和溶剂添加剂（4 V％DIO作为溶剂添加剂），具有F1：PC _（71）BM和F2：PC _（71）BM显示的功率转换效率（ PCE分别为5.80％和3.32％。尽管与F1相比，F2具有更广泛的吸收分布，但是F2基础的装置的PCE的较低值归因于F2和PC _（71）BM之间的低LumO偏移，其限制了激子解离。上述结果表明，这些共聚物可用于三元BHJ和串联太阳能电池来实现高PCE。

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