Influence of the Position of the Side Chain on Crystallization and Solar Cell Performance of DPP-Based Small Molecules

被引：114

作者：

Gevaerts, Veronique S. ^{[1
]}

Herzig, Eva M. ^{[2
]}

Kirkus, Mindaugas ^{[1
]}

Hendriks, Koen H. ^{[1
]}

Wienk, Martijn M. ^{[1
]}

Perlich, Jan ^{[3
]}

Mueller-Buschbaurn, Peter ^{[2
]}

Janssen, Rene A. J. ^{[1
]}

机构：

[1] Eindhoven Univ Technol, NL-5600 MB Eindhoven, Netherlands

[2] Tech Univ Munich, Dept Phys, Lehrstuhl Funktionelle Mat, D-85748 Garching, Germany

[3] DESY, D-22607 Hamburg, Germany

来源：

CHEMISTRY OF MATERIALS | 2014年 / 26卷 / 02期

关键词：

small molecules; solar cells; side chain engineering; morphology; crystallinity; POWER-CONVERSION EFFICIENCY; OPEN-CIRCUIT VOLTAGE; HIGH PHOTOVOLTAIC EFFICIENCY; HIGH FILL FACTORS; CONJUGATED POLYMER; CHARGE-TRANSPORT; BANDGAP POLYMER; DONOR MATERIALS; TANDEM POLYMER; ENERGY-LEVELS;

D O I：

10.1021/cm4034484

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：

Three isomeric a-conjugated molecules based on diketopyrrolopyrrole and bithiophene (DPP2T) substituted with hexyl side chains in different positions are investigated for use in solution-processed organic solar cells. Efficiencies greater than 3% are obtained when a mild annealing step is used. The position of the side chains on the DDP2Ts has a major influence on the optical and electronic properties of these molecules in thin semicrystalline films. By combining optical absorption and fluorescence spectroscopy, with microscopy (AFM and TEM) and scattering techniques (GIWAXS and electron diffraction), we find that the position of the side chains also affects the morphology and crystallization of these DPP2Ts when they are combined with a C-70 fullerene derivative in a thin film. The study demonstrates that changing the side chain position is an additional, yet complex, tool to influence behavior of conjugated molecules in organic solar cells.

引用

页码：916 / 926

页数：11

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