Design Strategy of Incorporating Flexible Chain Polymer Donors for High-efficiency, Large-Area Flexible Organic Solar Cells with Non-halogen Solvent Processability

Jing Li; Yu-han Wang; Ding-ding Qiu; Sheng-wei Shi; Zhi-xiang Wei; Kun Lu

doi:10.11777/j.issn1000-3304.2024.24304

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Design Strategy of Incorporating Flexible Chain Polymer Donors for High-efficiency, Large-Area Flexible Organic Solar Cells with Non-halogen Solvent Processability

Research Article | 更新时间：2025-07-08

- Design Strategy of Incorporating Flexible Chain Polymer Donors for High-efficiency, Large-Area Flexible Organic Solar Cells with Non-halogen Solvent Processability
- Acta Polymerica Sinica Vol. 56, Issue 7, Pages: 1074-1087(2025)
- 作者机构：
  
  1.武汉工程大学材料科学与工程学院等离子体化学与新材料湖北省重点实验室武汉 430205
  2.国家纳米科学中心中国科学院纳米系统与多级次制造重点实验室北京 100190
- 作者简介：
  
  Sheng-wei Shi, E-mail: shisw@wit.edu.cn
  Kun Lu, E-mail: lvk@nanoctr.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2024.24304
  CLC：
- CSTR：32057.14.GFZXB.2025.7348
- Received：23 December 2024，
  
  Accepted：26 January 2025，
  
  Published Online：07 April 2025，
  
  Published：20 July 2025
- 稿件说明：
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李静, 王昱涵, 仇丁丁, 石胜伟, 魏志祥, 吕琨. 引入柔性链的聚合物给体设计策略获得可非卤溶剂加工的高效柔性大面积有机太阳能电池. 高分子学报, 2025, 56(7), 1074-1087

Li, J.; Wang, Y. H.; Qiu, D. D.; Shi, S. W.; Wei, Z. X.; Lu, K. Design strategy of incorporating flexible chain polymer donors for high-efficiency, large-area flexible organic solar cells with non-halogen solvent processability. Acta Polymerica Sinica, 2025, 56(7), 1074-1087
李静, 王昱涵, 仇丁丁, 石胜伟, 魏志祥, 吕琨. 引入柔性链的聚合物给体设计策略获得可非卤溶剂加工的高效柔性大面积有机太阳能电池. 高分子学报, 2025, 56(7), 1074-1087 DOI： 10.11777/j.issn1000-3304.2024.24304. CSTR： 32057.14.GFZXB.2025.7348.

Li, J.; Wang, Y. H.; Qiu, D. D.; Shi, S. W.; Wei, Z. X.; Lu, K. Design strategy of incorporating flexible chain polymer donors for high-efficiency, large-area flexible organic solar cells with non-halogen solvent processability. Acta Polymerica Sinica, 2025, 56(7), 1074-1087 DOI： 10.11777/j.issn1000-3304.2024.24304. CSTR： 32057.14.GFZXB.2025.7348.

摘要

开发兼具优异器件性能和良好加工性能的聚合物给体是推进有机太阳能电池产业化的有效措施. 聚(2

6-(4

8-双(5-(2-乙基己基-3-氟)噻吩-2-基)-苯并(1

2-b:4

5-b')二噻吩))-(2-丁基辛基)噻吩-2-基-8-(4-(2-丁基辛基)-5-甲基噻吩-2-基)二噻吩并(3'

2':3

4;2''

3'':5

6)苯并(1

2)(1

5)噻二唑 (简称：D18)因其高效率的优势受到了很多研究者的兴趣，但是其强聚集特性限制了其用非卤溶剂加

工. 本文介绍了一种在聚合物给体D18共轭主链中引入含柔性烷基桥联单元的结构改性方法，通过改变柔性烷基链的长度，调节引入含柔性烷基的桥联单元的含量，合成了D18-3C-5%和D18-4C-5%两种溶解性显著改善的新型聚合物给体. 测试结果表明，当引入的柔性烷基链包含4个碳原子，含柔性烷基的桥联单元在聚合物主链中含量为5%时，所得的聚合物给体D18-4C-5%在使用非卤素溶剂邻二甲苯制备器件时可以获得高达17.32%的优异能量转换效率(PCE)，器件的开路电压(

)为0.87 V，短路电流密度(

)为25.53 mA·cm

-2

，填充因子(FF)为0.78. D18-4C-5%减弱的分子聚集和结晶性大大改善了其在非卤溶剂中的溶解性，表现出优异的器件加工性能. 基于D18-4C-5%:L8-BO的大面积柔性器件(1 cm

)也可实现14.00%的优异PCE. 本工作阐明了柔性链削弱聚集策略对聚合物给体加工性能改善的重要作用，能够解决强聚集聚合物给体材料在大面积溶液加工中的局限性，对高效有机太阳能电池的进一步发展具有重要意义.

Abstract

Developing polymer donors with both excellent device performance and good processability is an effective approach to advancing the commercialization of organic solar cells. D18 has attracted considerable interest from researchers due to its high efficiency

but its strong aggregation behavior limits its processability with non-halogen solvents. This paper introduces a structural modification method by incorporating flexible alkyl-br

idged units into the conjugated backbone of the polymer donor D18. By adjusting the length of the flexible alkyl chains and the content of the alkyl-bridged units

two novel polymer donors

D18-3C-5% and D18-4C-5%

with significantly improved solubility were synthesized. Test results show that when the flexible alkyl chain contains four carbon atoms and the content of flexible alkyl-bridged units in the polymer backbone is 5%

the resulting polymer donor D18-4C-5% achieves an outstanding power conversion efficiency (PCE) of 17.32% when devices are fabricated with the non-halogen solvent

-xylene. The device exhibits an open-circuit voltage (

) of 0.87 V

a short-circuit current density (

) of 25.53 mA·cm

-2

and a fill factor (FF) of 0.78. The reduced molecular aggregation and crystallinity of D18-4C-5% significantly improve its solubility in non-halogen solvents

demonstrating excellent device processability. Large-area flexible devices (1 cm²) based on D18-4C-5%:L8-BO can also achieve an excellent PCE of 14.00%. This work highlights the critical role of the flexible chain-induced aggregation reduction strategy in improving the processability of polymer donors and addresses the limitations of highly aggregated polymer donor materials in large-area solution processing. This study has significant implications for the further development of high-efficiency organic solar cells.

关键词

Keywords

references

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