Over 17.5% efficiency ternary organic solar cells with enhanced photon utilization via a medium band gap non-fullerene acceptor,Journal of Materials Chemistry A

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Over 17.5% efficiency ternary organic solar cells with enhanced photon utilization via a medium band gap non-fullerene acceptor
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-07-07 , DOI: 10.1039/d1ta04454k
Congcong Cao _{1,

2,

3,

4} , Hanjian Lai _{1,

2,

3,

4} , Hui Chen _{1,

2,

3,

4,

5} , Yulin Zhu _{1,

2,

3,

4} , Mingrui Pu _{1,

2,

3,

4} , Nan Zheng _{4,

6,

7,

8,

9} , Feng He _{1,

2,

3,

4,

10}

Affiliation

The light harvesting and photocurrent generation from acceptors largely determine the photovoltaic performance of organic solar cells (OSCs). We have designed and prepared two medium band gap non-fullerene acceptors (NFAs), BTIC-EH-2ThBr and BTIC-BO-2ThBr, containing end groups with low electron affinity. The absorption spectrum and the energy level are simultaneously finely tuned through the weak electron-withdrawing end group to serve as an excellent third component in ternary organic solar cells (TOSCs). The emission spectra of BTIC-EH-2ThBr and BTIC-BO-2ThBr mostly overlap with the absorption spectrum of the Y6 film, and efficient energy transfer is achieved from BTIC-EH-2ThBr or BTIC-BO-2ThBr to Y6. A cascade in the energy alignment could also be obtained. The morphology of the PM6:Y6:BTIC-EH-2ThBr blend film has been optimized with the addition of BTIC-EH-2ThBr as a third component. The introduction of a medium band gap molecule, BTIC-EH-2ThBr, alleviates excessive aggregation behavior and the crystallinity of the PM6:Y6 blend film. In this way, a high efficiency ternary device has been obtained with improved charge separation, transportation, collection and reduced exciton recombination. Overall, a TOSC based on PM6:Y6:BTIC-EH-2ThBr delivers the highest photovoltaic performance of 17.54% with enhanced photo utilization.

中文翻译：

通过中等带隙非富勒烯受体提高光子利用率的三元有机太阳能电池效率超过 17.5%

受体的光收集和光电流产生在很大程度上决定了有机太阳能电池 (OSC) 的光伏性能。我们设计并制备了两种中等带隙非富勒烯受体 (NFAs)，BTIC-EH-2ThBr 和 BTIC-BO-2ThBr，它们含有低电子亲和力的端基。吸收光谱和能级同时通过弱吸电子端基进行微调，作为三元有机太阳能电池 (TOSC) 中出色的第三组分。BTIC-EH-2ThBr和BTIC-BO-2ThBr的发射光谱大部分与Y6薄膜的吸收光谱重叠，实现了BTIC-EH-2ThBr或BTIC-BO-2ThBr到Y6的高效能量转移。还可以获得能量对准的级联。PM6:Y6的形态：BTIC-EH-2ThBr 共混薄膜通过添加 BTIC-EH-2ThBr 作为第三种成分进行了优化。中等带隙分子 BTIC-EH-2ThBr 的引入减轻了 PM6:Y6 共混膜的过度聚集行为和结晶度。通过这种方式，获得了具有改进的电荷分离、传输、收集和减少激子复合的高效三元器件。总体而言，基于 PM6:Y6:BTIC-EH-2ThBr 的 TOSC 可提供 17.54% 的最高光伏性能，并提高了光利用率。收集和减少激子重组。总体而言，基于 PM6:Y6:BTIC-EH-2ThBr 的 TOSC 可提供 17.54% 的最高光伏性能，并提高了光利用率。收集和减少激子重组。总体而言，基于 PM6:Y6:BTIC-EH-2ThBr 的 TOSC 可提供 17.54% 的最高光伏性能，并提高了光利用率。

更新日期：2021-07-26

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