Benzodithiophene with multiple side-chains for efficient wide-bandgap D–A copolymers,Journal of Materials Chemistry A

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Benzodithiophene with multiple side-chains for efficient wide-bandgap D–A copolymers
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-01-13 , DOI: 10.1039/d2ta08629h
Zhijian Li _{1,

2} , Yunlong Ma ₂ , Qingdong Zheng _{1,

2}

Affiliation

The limited selections of wide-bandgap polymer donors have prevented the further increase in the power conversion efficiency (PCE) of organic solar cells. In this work, we report two novel wide-bandgap alternating copolymers (PL4 and PL5), which were synthesized by copolymerizing a new benzodithiophene-derived electron-rich unit (D) with two electron-deficient units (A) of 5,6-difluoro-2-(2-hexyldecyl)-4,7-di(thiophen-2-yl)-2H-benzo[d][1,2,3]triazole and 1,3-bis(2-ethylhexyl)-5,7-di(thiophen-2-yl)-4H,8H-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione, respectively. PL5 shows a broader and red-shifted absorption spectrum compared to PL4 due to the more electron-withdrawing feature of its A moiety. Moreover, the energy levels of PL5 are relatively down-shifted compared to those of PL4. When blended with a low-bandgap non-fullerene acceptor (Y6), the best-performing PL5:Y6-based device exhibits a significantly higher PCE of 15.77% with an enhanced V_OC of 0.818 V, an excellent J_SC of 26.60 mA cm⁻², and a higher fill factor (FF) of 72.47% in comparison with the PL4:Y6-based PSC which shows a PCE of 7.53% with a V_OC of 0.718 V, a J_SC of 21.60 mA cm⁻², and a FF of 48.58%. The improved PCE of the PL5:Y6-based device can be ascribed to its more efficient charge transfer, dramatically increased charge carrier mobilities and reduced charge recombination.

中文翻译：

具有多个侧链的苯并二噻吩用于高效宽带隙 D-A 共聚物

宽带隙聚合物供体的有限选择阻碍了有机太阳能电池功率转换效率（PCE）的进一步提高。在这项工作中，我们报告了两种新型宽带隙交替共聚物（PL4 和 PL5），它们是通过将一种新的苯并二噻吩衍生的富电子单元 (D) 与两个 5,6- 缺电子单元 (A) 共聚合合成的二氟-2-(2-己基癸基)-4,7-二(噻吩-2-基)-2 H-苯并[ d ][1,2,3]三唑和1,3-双(2-乙基己基)- 5,7-二(噻吩-2-基)-4 H ,8 H -苯并[1,2- c :4,5- c']dithiophene-4,8-dione，分别。与 PL4 相比，PL5 显示出更宽且红移的吸收光谱，这是因为其 A 部分具有更多的吸电子特性。此外，与 PL4 相比，PL5 的能级相对较低。当与低带隙非富勒烯受体 (Y6) 混合时，性能最好的基于 PL5:Y6 的器件表现出 15.77% 的显着更高的 PCE，增强的V _OC为 0.818 V，出色的J _SC为 26.60 mA cm ⁻²，与基于 PL4:Y6 的 PSC 相比，填充因子 (FF) 更高，为 72.47%，后者显示出 7.53% 的 PCE，V _OC为 0.718 V，J _SC为 21.60 mA cm ^-2, FF 为 48.58%。基于 PL5:Y6 的设备的改进 PCE 可归因于其更有效的电荷转移、显着增加的电荷载流子迁移率和减少的电荷复合。

更新日期：2023-01-14

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