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Molecular Crystals and Liquid Crystals Volume 620, 2015 - Issue 1: KJF International Conference on Organic Materials for Electronics and Photonics 2014 (KJF-ICOMEP 2014)
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Original Articles

Morphology of F8T2/PC71BM Blend Film as Investigated by Scanning Transmission X-ray Microscope (STXM)

Yutaka MoritomoGraduate School of Science and Engineering, University of Tsukuba, Tsukuba, JapanCorrespondence[email protected]
,
Kouhei YonezawaGraduate School of Science and Engineering, University of Tsukuba, Tsukuba, Japan
,
Takeaki SakuraiGraduate School of Science and Engineering, University of Tsukuba, Tsukuba, Japan;PRESTO, JST, Saitama, Japan
,
Takeshi YasudaPhotovoltaic Materials Unit, NIMS, Tsukuba, Japan
,
Yasuo TakeichiInstitute of Materials Structure Science, KEK, Tsukuba, Japan
,
Hayato KamiokaGraduate School of Science and Engineering, University of Tsukuba, Tsukuba, Japan
,
Hiroki SugaDepartment of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
,
Yoshio TakahashiDepartment of Earth and Planetary Science, Univ. of Tokyo, Bunkyo-ku, Tokyo, Japan
,
Yuji YoshidaResearch Center for Photovoltaic Technologies, AIST, Tsukuba, Japan
,
Nobuhito InamiInstitute of Materials Structure Science, KEK, Tsukuba, Japan
,
Kazuhiko MaseInstitute of Materials Structure Science, KEK, Tsukuba, Japan
&
Kanta OnoInstitute of Materials Structure Science, KEK, Tsukuba, Japan
 show all
Pages 32-37 | Published online: 16 Dec 2015
 
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Abstract

Clarification of the morphology of bulk heterojunction (BHJ) is indispensable for true comprehension of the organic solar cells. Here, we performed scanning transmission X-ray microscopy (STXM) for a poly-(9,9-dioctylfluorene-co-bithiophene) (F8T2)/[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) blend film annealed at various temperatures (Tan). We found that the fullerene concentration within the polymer-rich domain decreases with Tan while the domain size (∼230 nm) is essentially unchanged. We will discuss the interrelation between the film morphology and the photovoltaic performance.

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