Nano-domain behaviour in P3HT:PCBM nanoparticles, relating material properties to morphological changes

被引：64

作者：

Holmes, Natalie P. ^{[1
]}

Burke, Kerry B. ^{[1
]}

Sista, Prakash ^{[2
]}

Barr, Matthew ^{[1
]}

Magurudeniya, Harsha D. ^{[2
]}

Stefan, Mihaela C. ^{[2
]}

Kilcoyne, A. L. David ^{[3
]}

Zhou, Xiaojing ^{[1
]}

Dastoor, Paul C. ^{[1
]}

Belcher, Warwick J. ^{[1
]}

机构：

[1] Univ Newcastle, Ctr Organ Elect, Callaghan, NSW 2308, Australia

[2] Univ Texas Dallas, Dept Chem, Richardson, TX 75080 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2013年 / 117卷

基金：

美国国家科学基金会;

关键词：

Nanoparticle; Polymer molecular weight; Morphology; Organic photovoltaic; PHASE-SEPARATION; MOLECULAR-WEIGHT; SOLAR-CELLS; POLYMER; P3HT/PCBM; POLY(3-HEXYLTHIOPHENE); MISCIBILITY;

D O I：

10.1016/j.solmat.2013.06.003

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：

In this article we report a morphological study of the poly(3-hexylthiophene) (P3HT): phenyl-C61butyric acid methyl ester (PCBM) material system in nanoparticle organic thin films. The morphology and chemical composition of unannealed and annealed P3HT:PCBM nanoparticles has been investigated using scanning transmission X-ray microscopy (STXM) for a range of P3HT molecular weights (M-w= 5-72 kg mol(-1)). Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) have been used to support the STXM data. We find that unannealed P3HT:PCBM nanoparticles (NPs) exhibit a common core-shell morphology, with a PCBM-rich core and P3HT-rich shell. The morphology of the thermally annealed NP films is highly dependent upon the molecular weight of the P3HT and is determined by PCBM diffusion through the P3HT matrix. Two PCBM diffusion mechanisms operate within this system: (1) at high molecular weights diffusion of molecular PCBM dominates whilst, (2) at low molecular weights diffusion of the PCBM cores is significant. The Stokes-Einstein continuum model for diffusion has been used to determine a threshold molecular weight at which the diffusion of PCBM cores is activated in these films. The calculated value (M-W similar to 38-25 kg mol(-1)) is shown to agree very well with experimental observations. Finally, a model for the morphological evolution of annealed P3HT: PCBM NP films is developed. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：437 / 445

页数：9

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