Small Molecules with Asymmetric 4-Alkyl-8-alkoxybenzo[1,2-b:4,5-b′]dithiophene as the Central Unit for High-Performance Solar Cells with High Fill Factors

被引：26

作者：

Guo, Yuan-Qiang ^{[1
,2
]}

Wang, Yunchuang ^{[1
,2
]}

Song, Li-Cheng ^{[1
,2
]}

Liu, Feng

Wan, Xiangjian ^{[1
,2
]}

Zhang, Hongtao ^{[1
,2
]}

Chen, Yongsheng ^{[1
,2
,3
]}

机构：

[1] Nankai Univ, Ctr Nanoscale Sci & Technol, Tianjin 300071, Peoples R China

[2] Nankai Univ, Key Lab Funct Polymer Mat,Coll Chem, State Key Lab Elementoorgan Chem, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300071, Peoples R China

[3] Nankai Univ, Natl Inst Adv Mat, Sch Mat Sci & Engn, Tianjin 300071, Peoples R China

来源：

CHEMISTRY OF MATERIALS | 2017年 / 29卷 / 08期

基金：

美国国家科学基金会;

关键词：

POWER CONVERSION EFFICIENCY; PROCESSED SMALL-MOLECULE; OPEN-CIRCUIT VOLTAGE; ORGANIC PHOTOVOLTAICS; BENZODITHIOPHENE UNIT; CATHODE INTERLAYER; POLYMER; MORPHOLOGY; 10-PERCENT; BREAKING;

D O I：

10.1021/acs.chemmater.7b00642

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A small molecule named DRBDTCO based on benzo[1,2-b:4,5-b']dithiophene (BDT) with an asymmetric side chain and its dimer, dDRBDTCO, with the octamethylene connector were designed and synthesized as donor materials for solution-processed bulk heterojunction solar cells. The optimized power conversion efficiency of a DRBDTCO-based device was 8.18% under AM 1.5 G irradiation (100 mW cm(-2)), which is higher than that of its dDRBDTCO-based device. Both molecule based devices exhibited high fill factors of >73%, which are attributed to their optimized morphologies with a feature size of 15-20 nm, highly efficient charge collection, less bimolecular recombination, and well-balanced charge transport properties. The results demonstrate that the asymmetric BDT unit could be a promising building block for donor materials with high efficiencies and high fill factors.

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页码：3694 / 3703

页数：10

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