A Designed Ladder-Type Heteroarene Benzodi(Thienopyran) for High-Performance Fullerene-Free Organic Solar Cells

被引：28

作者：

Wu, Hao ^{[1
,2
]}

Fan, Haijun ^{[1
]}

Xu, Shengjie ^{[1
]}

Zhang, Cheng ^{[1
,2
]}

Chen, Shanshan ^{[3
]}

Yang, Changduk ^{[3
]}

Chen, Daoliang ^{[2
]}

Liu, Feng ^{[1
,2
]}

Zhu, Xiaozhang ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100190, Peoples R China

[3] Ulsan Natl Inst Sci & Technol UNIST, Sch Energy & Chem Engn, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr,Dept Energy Engn, 50 UNIST Gil, Ulsan 44919, South Korea

来源：

SOLAR RRL | 2017年 / 1卷 / 12期

基金：

中国国家自然科学基金;

关键词：

electron acceptors; fused-ring system; organic solar cells; power conversion efficiency; pyran; ELECTRON-ACCEPTOR; POLYMER; EFFICIENT; UNIT;

D O I：

10.1002/solr.201700165

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

To meet the imminent requirement of fullerene-free electron acceptors, a new ladder-type heteroarene benzodi(thienopyran) (BDTP) is designed and synthesized by embedding pyran rings in [2,2-(2,5-dialkyloxy-1,4-phenylene)dithiophene] (PDT) for organic photovoltaic (OPV) applications. Originating from the strong p-conjugation of the oxygen atom in the pyran rings, electron-rich BDTP results in the BDTP-cored molecular acceptor, NBDTP, with strong intramolecular charge transfer effect. With sp(3) carbons in pyran rings, NBDTP have the flexibility of targeted modification to resolve the solubility as well as the morphological tuning by handy alkyl chain attachment. As a result, the fusion of pyran rings in BDTP means that the acceptor exhibits a narrow optical band gap of 1.58eV and a high LUMO energy level of -3.79eV. Meanwhile, blend morphology of NBDTP-based OPVs shows fine tunability via thermal annealing. Owing to the beneficial optical absorption, suitable energy-level alignment, favorable molecule packing, and proper morphology, the optimized NBDTP-based OPVs achieve a power conversion efficiency of up to 10.1%, which exemplifies the potential of utilizing molecular acceptors featuring ladder-type heteroarenes for high-performance OPVs.

引用

页数：6

共 38 条

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