A 3,3′‐Difluoro‐2,2′‐Bithiophene Based Donor Polymer Realizing High Efficiency (>17%) Single Junction Binary Organic Solar Cells

Author:

Su Zhiyi1,Liu Wenlong1,Lin Yi2,Ma Zaifei12,Zhang Andong3,Lu Hao4,Xu Xinjun1,Li Cuihong1ORCID,Liu Yahui3ORCID,Bo Zhishan13ORCID

Affiliation:

1. Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 China

2. Center for Advanced Low‐dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China

3. College of Textiles & Clothing State Key Laboratory of Bio‐fibers and Eco‐textiles Qingdao University Qingdao 266071 China

4. College of Materials Science and Engineering Qingdao University Qingdao 266071 China

Abstract

AbstractIn this study, two novel donor–acceptor (D–A) copolymers are designed and synthesized, DTBT‐2T and DTBT‐2T2F with 2,2′‐bithiophene or 3,3′‐difluoro‐2,2′‐bithiophene as the donor unit and dithienobenzothiadiazole as the acceptor unit, and used them as donor materials in non‐fullerene organic solar cells (OSCs). Due to enhanced planarity of polymer chains resulted by the intramolecular F···S noncovalent interactions, the incorporation of 3,3′‐difluoro‐2,2′‐bithiophene unit instead of 2,2′‐bithiophene into the polymers can enhance their molecular packing, crystallinity and hole mobility. The DTBT‐2T:L8‐BO based binary OSCs deliver a power conversion efficiency (PCE) of only 9.71% with a Voc of 0.78 V, a Jsc of 20.69 mA cm−2, and an FF of 59.67%. Moreover, the introduction of fluoro atoms can lower the highest occupied molecular orbital levels. As a result, DTBT‐2T2F:L8‐BO based single‐junction binary OSCs exhibited less recombination loss, more balanced charge mobility, and more favorable morphology, resulting in an impressive PCE of 17.03% with a higher Voc of 0.89 V, a Jsc of 25.40 mA cm−2, and an FF of 75.74%. These results indicate that 3,3′‐difluoro‐2,2′‐bithiophene unit can be used as an effective building block to synthesize high performance polymer donor materials. This work greatly expands the selection range of donor units for constructing high‐performance polymers.

Funder

National Natural Science Foundation of China

Publisher

Wiley

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3