Indole-based A–DA′D–A type acceptor-based organic solar cells achieve efficiency over 15 % with low energy loss,Sustainable Energy & Fuels

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Indole-based A–DA′D–A type acceptor-based organic solar cells achieve efficiency over 15 % with low energy loss
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-10-21 , DOI: 10.1039/d0se01343a
Yu Chen _{1,

2,

3,

4} , Rui Cao _{1,

2,

3,

4} , Hui Liu _{1,

2,

3,

4} , M. L. Keshtov _{5,

6,

7} , Emmanuel N. Koukaras _{8,

9,

10,

11,

12} , Hemraj Dahiya _{13,

14,

15,

16} , Yingping Zou _{1,

2,

3,

4} , Ganesh D. Sharma _{13,

14,

15,

16}

Affiliation

College of Chemistry and Chemical Engineering
Central South University
Changsha
P. R. China
Institute of Organoelement Compounds of the Russian Academy of Sciences
Moscow 119991
Russian Federation
Laboratory of Quantum and Computational Chemistry
Department of Chemistry
Aristotle University of Thessaloniki
GR-54124 Thessaloniki
Greece
Department of Physics
The LNM Institute for Information Technology
Jaipur 302031
India

In order to increase the power conversion efficiency (PCE) of organic solar cells, developing high-performance non-fullerene small molecule acceptors is important for efficient charge generation and small energy loss. Herein, we design and synthesize a new member of the A–DA′D–A-series acceptor family, Y18-ID, which employs 1-hexyl-1H indole (ID) instead of the traditional 2-hexylthieno[3.2-b]thiophene as the electronic donor. Compared to Y18, Y18-ID exhibits extended optical absorption towards the longer wavelength region and an upshift in both the highest occupied molecular orbital and the lowest unoccupied molecular orbital energy levels. Organic solar cells based on P:Y18-ID delivered a power conversion efficiency of 15.25% with a very low energy loss of 0.51 eV. We believe that Y18-ID may become one of the most important candidates among non-fullerene acceptors, owing to its broader absorption profile and higher lowest unoccupied molecular orbital, which allow it to achieve both high open circuit voltage and short circuit current simultaneously.

中文翻译：

基于吲哚的A–DA'D–A型受体有机太阳能电池的效率超过15％，且能量损失低

为了提高有机太阳能电池的功率转换效率（PCE），开发高性能的非富勒烯小分子受体对于有效产生电荷和减少能量损失很重要。本文中，我们设计并合成了A–DA'D–A系列受体家族的新成员Y18-ID，该成员使用1-己基-1 H吲哚（ID）代替了传统的2-己基噻吩并[3.2- b ]噻吩作为电子供体。与Y18相比，Y18-ID对更长的波长区域表现出更大的光学吸收，并且在最高占据的分子轨道和最低的未占据分子轨道能级上都有上移。基于P的有机太阳能电池：Y18-ID的功率转换效率为15.25％，而能量损失仅为0.51 eV，非常低。我们认为，Y18-ID可能由于其更宽的吸收分布和更高的最低未占据分子轨道而成为非富勒烯受体中最重要的候选者之一，这使其可以同时实现高开路电压和短路电流。

更新日期：2020-11-06

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