Hexafluoroquinoxaline Based Polymer for Nonfullerene Solar Cells Reaching 9.4% Efficiency,ACS Applied Materials & Interfaces

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Hexafluoroquinoxaline Based Polymer for Nonfullerene Solar Cells Reaching 9.4% Efficiency
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-05-22 00:00:00 , DOI: 10.1021/acsami.7b03947
Shutao Xu ₁ , Liuliu Feng ₁ , Jun Yuan ₁ , Zhi-Guo Zhang ₂ , Yongfang Li ₂ , Hongjian Peng ₁ , Yingping Zou _{1,

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Affiliation

Through introducing six fluorine atoms onto quinoxaline (Qx), a new electron acceptor unit-hexafluoroquinoxaline (HFQx) is first synthesized. On the basis of this unit, we synthesize a new donor–acceptor (D–A) copolymer (HFQx-T), which is composed of a benzodithiophene (BDT) derivative donor block and an HFQx accepting block. The strong electron-withdrawing properties of fluorine atoms increase significantly the open-circuit voltage (V_oc) by tuning the highest occupied molecular orbital (HOMO) energy level. In addition, fluorine atoms enhance the absorption coefficient of the conjugated copolymer and change the film morphology, which implies an increase of the short-circuit current density (J_sc) and fill factor (FF). Indeed, the HFQx-T:ITIC blended film achieves an impressive power conversion efficiency (PCE) of 9.4% with large short-current density (J_sc) of 15.60 mA/cm², high V_oc of 0.92 V, and FF of 65% via two step annealing (thermal annealing (TA) and solvent vapor annealing (SVA) treatments). The excellent results obtained show that the new copolymer HFQx-T synthesized could be a promising candidate for organic photovoltaics.

中文翻译：

用于非富勒烯太阳能电池的六氟喹喔啉类聚合物的效率达到9.4％

通过将六个氟原子引入喹喔啉（Qx），首先合成了一个新的电子受体单元-六氟喹喔啉（HFQx）。在此单元的基础上，我们合成了一种新的供体-受体（DA）共聚物（HFQx-T），该共聚物由苯并二噻吩（BDT）衍生物供体嵌段和HFQx接受嵌段组成。氟原子的强吸电子特性通过调节最高占据分子轨道（HOMO）的能级来显着提高开路电压（V _oc）。此外，氟原子可提高共轭共聚物的吸收系数并改变膜的形态，这意味着短路电流密度会增加（J _sc）和填充因子（FF）。的确，HFQx-T：ITIC混合膜实现了令人印象深刻的9.4％的功率转换效率（PCE ），15.60 mA / cm ^2的大短电流密度（J _sc），0.92 V的高V _oc和65的FF ％通过两步退火（热退火（TA）和溶剂蒸气退火（SVA）处理）。获得的优异结果表明，合成的新型共聚物HFQx-T可能是有机光伏的有前途的候选者。

更新日期：2017-05-31

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