Ultrasonic spray coating of 6.5% efficient diketopyrrolopyrrole-based organic photovoltaics

Jeffrey G. Tait, Cindy Wong, David Cheyns, Mathieu Turbiez, Barry P. Rand, Paul Heremans

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Ultrasonic spray coating was tailored for the deposition of diketopyrrolopyrrole-based polymer: fullerene films. Concurrently pumped spray coating was used to rapidly and precisely sweep photoactive layer thickness and donor:acceptor ratio. The highest reported efficiency for a spray-coated device of 6.5% was achieved and verified by external quantum efficiency. The short-circuit current density of the complete device stack was optically simulated as a function of thickness, agreeing with experimentally measured device performance. Charge carrier mobilities were studied as a function of fullerene loading, suggesting electron mobility limited performance. This paper shows that implementing the industrially relevant deposition technique of spray coating results in no performance loss relative to lab-based spin coating.

Original languageEnglish (US)
Article number6906235
Pages (from-to)1538-1544
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume4
Issue number6
DOIs
StatePublished - Nov 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Keywords

  • Bulk heterojunction
  • diketopyrrolopyrrole,optical modeling
  • organic
  • photovoltaic cells
  • space charge limited current
  • spray coating

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