Stacked organic solar cells based on pentacene and C60

David Cheyns*, Hans Gommans, Mathieu Odijk, Jef Poortmans, Paul Heremans

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

69 Citations (Scopus)

Abstract

In order to improve photon harvesting, two small molecule organic solar cells are placed in series on top of each other. These stacked cells need an efficient recombination center in between both cells. In this study we test vacuum deposited metal layers as recombination centers with pentacene and buckminsterfullerene (C60) as donor and acceptor, respectively. S-shaped curves are visible in the I-V characteristics when using thin layers of aluminum, indicating a barrier for extraction inside the device. Thin metal layers of gold or silver result in an increased open-circuit voltage without the appearance of these S-shaped features.

Original languageEnglish
Pages (from-to)399-404
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume91
Issue number5
DOIs
Publication statusPublished - 6 Mar 2007
Externally publishedYes

Keywords

  • Fullerene
  • Planar heterojunction solar cells
  • Stacked solar cells
  • Tandem

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