Influence of Ester-functionalized Thiazole on Crystallization, Film Morphology, and Photovoltaic Performance of the Ternary Copolymers

Ke-xin Zhao; Wen-jing Liu; Shuai-shuai Shen; Ya-hui Liu; Jin-sheng Song

doi:10.11777/j.issn1000-3304.2025.25044

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Influence of Ester-functionalized Thiazole on Crystallization, Film Morphology, and Photovoltaic Performance of the Ternary Copolymers

Research Article | 更新时间：2025-07-08

- Influence of Ester-functionalized Thiazole on Crystallization, Film Morphology, and Photovoltaic Performance of the Ternary Copolymers
- Acta Polymerica Sinica Vol. 56, Issue 7, Pages: 1129-1139(2025)
- 作者机构：
  
  1.河南大学纳米科学与工程研究院开封 475100
  2.青岛大学纺织服装学院生物多糖纤维成形与生态纺织国家重点实验室青岛 266071
- 作者简介：
  
  Jin-sheng Song, E-mail: songjs@henu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25044
  CLC：
- CSTR：32057.14.GFZXB.2025.7382
- Received：20 February 2025，
  
  Accepted：12 March 2025，
  
  Published Online：16 April 2025，
  
  Published：20 July 2025
- 稿件说明：
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赵可新, 刘文静, 申帅帅, 刘亚辉, 宋金生. 酯基噻唑对三元共聚物结晶成膜行为的调控及光伏性能研究. 高分子学报, 2025, 56(7), 1129-1139

Zhao, K. X.; Liu, W. J.; Shen, S. S.; Liu, Y. H.; Song, J. S. Influence of ester-functionalized thiazole on crystallization, film morphology, and photovoltaic performance of the ternary copolymers. Acta Polymerica Sinica, 2025, 56(7), 1129-1139
赵可新, 刘文静, 申帅帅, 刘亚辉, 宋金生. 酯基噻唑对三元共聚物结晶成膜行为的调控及光伏性能研究. 高分子学报, 2025, 56(7), 1129-1139 DOI： 10.11777/j.issn1000-3304.2025.25044. CSTR： 32057.14.GFZXB.2025.7382.

Zhao, K. X.; Liu, W. J.; Shen, S. S.; Liu, Y. H.; Song, J. S. Influence of ester-functionalized thiazole on crystallization, film morphology, and photovoltaic performance of the ternary copolymers. Acta Polymerica Sinica, 2025, 56(7), 1129-1139 DOI： 10.11777/j.issn1000-3304.2025.25044. CSTR： 32057.14.GFZXB.2025.7382.

摘要

有机太阳能电池(OSCs)的长足进步，得益于非富勒烯受体的快速发展，这也对聚合物给体提出了更高要求. 无规三元共聚策略作为一种简单有效的方法，能够实现对聚合物能级、吸收、结晶性以及聚集行为的微调. 设计并合成了一系列含不同比例噻唑-4-羧酸乙酯(E-Tz)的聚合物给体LTz-0、LTz-5、LTz-10和LTz-15. 随着E-Tz含量的增加，给体聚合物表现出更显著的温度依赖聚集特性、结晶性减弱、HOMO能级逐渐降低，从而实现了共混膜形貌的调控和高开路电压(

). 最终，基于LTz-10:Y6的共混膜展现出更均匀的纤维网络结构和优异的电荷传输特性，实现了18.02%能量转换效率(PCE)，较参照系LTz-0提高了13%，为目前基于芳香内酯三元共聚物体系中的领先效率之一. 研究表明，E-Tz的引入能够实现给体聚合物聚集行为的有效调控，并显著提升光伏性能.

Abstract

The remarkable progress of organic solar cells (OSCs) has been driven by the rapid advancement of non-fullerene acceptors

which has in turn raised high demands for polymer donors. As a simple and effective approach

the random ternary copolymerization strategy optimizes existing polymers to enhance their energy levels

absorption

crystallinity

and aggregation behavior. A series of polymer donors LTz-0

LTz-5

LTz-10

and LTz-15 containing different ratios of ester-functionalized thiazole (E-Tz) were designed and synthesized. As the E-Tz content increases

the polymer donor exhibits ideal temperature-dependent aggregation characteristics

crystallinity decreases

and its HOMO energy level gradually deepens

effectively regulating the phase separation of the blend film and increasing the open circuit voltage (

). Finally

the device based on LTz-10:Y6 exhibits compact interpenetrated networks and excellent charge transport properties. Its power conversion efficiency (PCE) reaches 18.02%

which is 13% higher than that of LTz-0

marking it one of the highest efficiencies among the reported lactone based copolymers. The results shows that the addition of E-Tz can optimize the film morphology and significantly improve the final photovoltaic performance.

关键词

Keywords

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