Fused thienobenzene-thienothiophene electron acceptors for organic solar cells

作     者：Ye Xu Haotian Jiang Tsz-Ki Lau Jingshuai Zhu Jiayu Wang Xinhui Lu Xiaowei Zhan Yuze Lin Ye Xu;Haotian Jiang;Tsz-Ki Lau;Jingshuai Zhu;Jiayu Wang;Xinhui Lu;Xiaowei Zhan;Yuze Lin

作者机构：Department of ChemistryCapital Normal UniversityBeijing 100048China Department of Materials Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China Department of PhysicsThe Chinese University of Hong KongNew TerritoriesHong KongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2019年第28卷第10期

页      面：58-65页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：NSFC (21504058) NSFC/RGC Joint Research Scheme No. N_CUHK418/17 Research Grant Council of Hong Kong (General Research Fund No. 14314216) the beam time and technical supports provided by 19U2 beamline at SSRF, Shanghai 

主　　题：Organic solar cell Fused ring electron acceptor Thienobenzene Non-fullerene 

摘      要：Small molecule ladder-type heteroarenes IHBT-2F is designed and synthesized with strong electrondonating and molecular packing properties, where the central unit, fused thienobenzene-thienothiphene (IHBT), is attached with the strong electron-deficient 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (2FIC) as the end group. The counterpart IDBT-2F with indancenodibenzothiophene (IDBT) mainchain is sythesized for comparison, in which thieno[3,2-b]thiophene (TT) core of IHBT is replaced by benzene core. Relative to benzene-core IDBT-2F, TT-core IHBT-2F shows a much higher highest occupied molecular orbital energy level (IHBT-2F:-5.46 eV;IDBT-2F:-5.72 eV) and significantly redshifted absorption, due to the π-donor capability of the sulfur atom, the larger π-conjugation and stronger intermolecular π-π stacking. The as-cast organic solar cells (OSCs) based on blends of PTB7-Th donor and IHBT-2F acceptor without additional treatments exhibit power conversion efficiencies (PCEs) as high as 8.74%, which is much higher than that of PTB7-Th:IDBT-2F (6.73%).