Morphological analysis of co-evaporated blend films based on initial growth for organic photovoltaics

Yosei Shibata, Tetsuya Taima, Ying Zhou, Noboru Ohashi, Takahiro Kono, Yuji Yoshida

Research output: Contribution to journalArticlepeer-review

Abstract

Bulk heterojunction structures composed of electron donor and acceptor molecules for application in high-performance organic photovoltaics studied. To fabricate these structures, the co-evaporation method in vacuum is commonly applied; however, the details of the crystal growth process during co-evaporation have not yet been established. Here, we focused on structural analysis of blend films composed of phthalocyanine and fullerene based on initial growth stage. Similar crystal growth behavior to that typically observed in single-component molecules is obtained for the films. These results suggest that the competitive crystal growth between donors and acceptors occurs during co-evaporation process. The balance of thin film growth among donor and acceptor molecules can be related to improved photovoltaic performance. The homogeneous blend structure leads to improvement of the power conversion efficiency from 1.2% to 3.0%.

Original languageEnglish
Pages (from-to)1261-1266
Number of pages6
JournalApplied Surface Science
Volume355
DOIs
Publication statusPublished - 2015 Nov 15
Externally publishedYes

Keywords

  • Blend morphology
  • Bulk heterojunction
  • Co-evaporation
  • Initial growth
  • Organic photovoltaics

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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