Mixing Behavior in Small Molecule:Fullerene Organic Photovoltaics

被引：88
作者：
Oosterhout, Stefan D. [1 ]
Savikhin, Victoria [1 ,5 ]
Zhang, Junxiang [2 ,3 ]
Zhang, Yadong [2 ,3 ]
Burgers, Mark A. [4 ]
Marder, Seth R. [2 ,3 ]
Bazan, Guillermo C. [4 ]
Toney, Michael F. [1 ]
机构：
[1] SLAG Natl Accelerator Lab, 2575 Sand Hill Rd,Bldg 137, Menlo Pk, CA 94025 USA
[2] Georgia Inst Technol, Sch Chem & Biochem, 901 Atlantic Dr, Atlanta, GA 30332 USA
[3] Georgia Inst Technol, Ctr Organ Photon & Elect, 901 Atlantic Dr, Atlanta, GA 30332 USA
[4] Univ Calif Santa Barbara, Dept Mat & Chem & Biochem, Santa Barbara, CA 93106 USA
[5] Stanford Univ, Elect Engn Dept, 350 Serra Mall, Stanford, CA 94305 USA
来源：
CHEMISTRY OF MATERIALS | 2017年 / 29卷 / 07期
关键词：
POLYMER SOLAR-CELLS; POWER-CONVERSION EFFICIENCY; EXCITON DIFFUSION LENGTH; CARRIER MOBILITY; PERFORMANCE; MORPHOLOGY; MISCIBILITY; MOLECULES; MICROSTRUCTURE; POLYTHIOPHENE;
D O I：
10.1021/acs.chemmater.7b00067
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：
We report a novel method to determine the amount of pure, aggregated phase of donor and acceptor in organic photovoltaic (OPV) bulk heterojunctions. By determination of the diffraction intensity per unit volume for both donor and acceptor, the volume content of pure, aggregated donor and acceptor in the blend can be determined. We find that for the small molecule X2:[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) system, in contrast to most polymer systems, all the PCBM is aggregated, indicating there is negligible miscibility of PCBM with X2. This provides an explanation why the performance of OPV devices of X2:PCBM are high over a large range of PCBM concentrations. This is in contrast to many other OPV blends, where PCBM forms a mixed phase with the donor and does not provide sufficient transport for electrons when the PCBM concentration is low. This study demonstrates that a mixed phase is not necessarily a requirement for good OPV device performance.
引用
收藏
页码：3062 / 3069
页数：8
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