Improved organic solar cell efficiency based on the regulation of an alkyl chain on chlorinated non-fullerene acceptors,Materials Chemistry Frontiers

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Improved organic solar cell efficiency based on the regulation of an alkyl chain on chlorinated non-fullerene acceptors
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-06-05 , DOI: 10.1039/d0qm00151a
Han Yu _{1,

2,

3,

4,

5} , Ruijie Ma _{6,

7,

8,

9} , Yiqun Xiao _{10,

11,

12,

13} , Jianquan Zhang _{6,

7,

8,

9} , Tao Liu _{6,

7,

8,

9} , Zhenghui Luo _{6,

7,

8,

9} , Yuzhong Chen _{6,

7,

8,

9} , Fujin Bai _{6,

7,

8,

9} , Xinhui Lu _{10,

11,

12,

13} , He Yan _{6,

7,

8,

9} , Haoran Lin _{1,

2,

3,

4,

5}

Affiliation

Non-fullerene acceptors (NFAs) have attracted significant research attention as they enable high-performance organic solar cells (OSCs). Recently, a new NFA named Y6 was reported to yield highly efficient OSCs with efficiency up to 15.7%. Then, the research interests regarding the structure–property relationship and further structural optimization of Y6 have risen sharply. In this study, we report a new NFA, N3-4Cl, using IC-2Cl as the end group and replacing the alkyl side chains on the N-position of the pyrrole unit with branched side chains on the third position. The combined substitution on Y6 yields electronic effects on energy levels and thus the open-circuit voltage (V_oc) of the corresponding OSCs. The lowest unoccupied molecular orbital (LUMO) level of N3-4Cl is up-shifted compared to that of Y6-4Cl; thus, a higher V_oc of 0.85 V is obtained. In addition, PM6: an N3-4Cl blend film can also maintain an optimal blend morphology with reasonably high and balanced charge mobility, which leads to a high fill factor (FF) of up to 74.9%. As a result, PM6:N3-4Cl-based device reached a PCE of 16.5% in binary devices. The results suggest that tuning the side chains of NFAs is an effective method for optimizing energy levels and aggregation properties, thus enhancing the OSC performances.

中文翻译：

基于氯化非富勒烯受体上烷基链的调节，提高了有机太阳能电池的效率

非富勒烯受体（NFA）由于能够实现高性能有机太阳能电池（OSC）而引起了广泛的研究关注。最近，据报道，一个名为Y6的新NFA可以产生效率高达15.7％的高效OSC。然后，关于Y6的结构-性质关系以及进一步的结构优化的研究兴趣急剧上升。在这项研究中，我们报告了一个新的NFA，N3-4Cl，使用IC-2Cl作为端基，并用第三个位置的支链侧链取代了吡咯单元N位置的烷基侧链。Y6上的组合取代对能级产生电子效应，因此对开路电压（V _oc）的相应OSC。最低未占分子轨道（LUMO）的水平N3-4Cl是上移相比的Y6-4Cl ; 因此，可获得0.85V的更高的V _oc。此外，PM6：N3-4Cl混合膜还可以保持最佳的混合形态，并具有相当高且平衡的电荷迁移率，从而导致高达74.9％的高填充因子（FF）。结果，在二进制设备中，基于PM6：N3-4Cl的设备的PCE达到16.5％。结果表明，调节NFA的侧链是优化能级和聚集性质的有效方法，从而增强了OSC性能。

更新日期：2020-07-30

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