Study on interactions among ortho-biphenyl groups in oligothiophene for structural control of bulk heterojunction films

Yosei Shibata, Takahiro Kono, Noboru Ohashi, Yuji Yoshida

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

To elucidate the optimal bulk heterojunction (BHJ) film for high-performance organic photovoltaics, structural control of BHJ films based on small molecules is one of the great challenges. A homogeneous BHJ structure based on oligothiophene and fullerene has been fabricated by means of terminalmodification using the sterically bulky t-butyl group. However, the suppression of interaction among the oligothiophene molecules produces a low fill factor. Molecular design of donor material in order to obtain good fill factor was not clear. Herein, we synthesized oligothiophene with sterically bulky o-biphenyl groups possessing molecular flexibility. We achieved balance between the morphological control of BHJ films and improvement of the fill factor. In this study, we suggest that improvement of fill factor is attributed to increasing hole mobility and crystallinity by ortho-biphenyl group.

Original languageEnglish
Pages (from-to)163-169
Number of pages7
JournalThin Solid Films
Volume583
Issue number1
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Bulk heterojunction structure
  • Mobility
  • Morphological control
  • Oligothiophene
  • Organic photovoltaics
  • Terminal modification

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Study on interactions among ortho-biphenyl groups in oligothiophene for structural control of bulk heterojunction films'. Together they form a unique fingerprint.

Cite this