Influence of Stacking Order of Phthalocyanine and Fullerene Layers on the Photoexcited Carrier Dynamics in Model Organic Solar Cell

Kenichi Ozawa, Susumu Yamamoto, Tetsuya Miyazawa, Keita Yano, Koji Okudaira, Kazuhiko Mase, Iwao Matsuda

Research output: Contribution to journalArticlepeer-review

Abstract

Metal phthalocyanine and fullerene are typical p-type and n-type organic semiconductors and are often used as constituents of model systems of organic photovoltaics (OPVs). The light-electricity conversion efficiency of the OPVs is influenced by many factors, and a composite structure is one of them. In the present study, time-resolved X-ray photoelectron spectroscopy has been utilized to examine the influence of the stacking order of copper phthalocyanine (CuPc) and fullerene (C60) on photoexcited carrier dynamics in layered CuPc-C60thin-film OPVs fabricated on a rutile TiO2(110) substrate. TiO2is a strong n-type semiconductor and is found to serve as an electron acceptor, which collects the excited electrons in both CuPc and C60layers irrespective of their stacking order. However, a clear difference is found in the electron transfer from C60to TiO2in short delay times below 1 ns; an electron transfer is facilitated in CuPc/C60/TiO2stacking, whereas the fast electron transfer is suppressed in C60/CuPc/TiO2stacking. The insertion of the CuPc layer between C60and TiO2is effective to block the C60→ TiO2electron transfer even though the CuPc layer has a monolayer thickness.

Original languageEnglish
Pages (from-to)13963-13970
Number of pages8
JournalJournal of Physical Chemistry C
Volume125
Issue number25
DOIs
Publication statusPublished - 2021 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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