Increase in open-circuit voltage and improved stability of organic solar cells by inserting a molybdenum trioxide buffer layer

Hideyuki Murata, Yoshiki Kinoshita, Yoshihiro Kanai, Toshinori Matsushima, Yuya Ishii

Research output: Contribution to journalConference articlepeer-review

Abstract

We report an increase in open-circuit voltage (Voc) by inserting an MoO3 layer on ITO substrate to improve built-in potential of organic solar cells (OSCs). In the OSCs using 5,10,15,20-tetraphenylporphyrine (H2TPP) as p-type material and C60 as n-type material, the V0c. effectively increased from 0.57 to 0.97 V with increasing MoO3 thickness. The obtained highest Voc (0.97 V) is consistent with the theoretical value estimated from the energy difference between the LUMO (-4.50 eV) of C60 and the HOMO (-5.50 eV) of H 2TPP layer. Importantly, the enhancement in the Voc was achieved without affecting the short-circuit current density (Jsc) and the fill-factor (FF). Thus, the power conversion efficiency of the device increased linearly from 1.24% to 1.88%. We also demonstrated that a MoO 3 buffer layer enhances the stability of OSCs after photo-irradiation. We have investigated the stability of OSCs using H 2TPP and N,N'-di(1-naphthyl)-N,N-diphenylbenzidine as p-type layer. Both devices with MoO3 layer showed improved stability. These results clearly suggest that the interface between ITO and p-type layer affects device stability.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume1154
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event2009 MRS Spring Meeting: MRS Symposium B on Concepts in Molecular and Organic Electronics - San Francisco, CA, United States
Duration: Apr 13 2009Apr 17 2009

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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