Flexible organic tandem solar modules: A story of up-scaling

George D. Spyropoulos*, Peter Kubis, Ning Li, Luca Lucera, Michael Salvador, Derya Baran, Florian Machui, Tayebeh Ameri, Monika M. Voigt, Christoph J. Brabec

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The competition in the field of solar energy between Organic Photovoltaics (OPVs) and several Inorganic Photovoltaic technologies is continuously increasing to reach the ultimate purpose of energy supply from inexpensive and easily manufactured solar cell units. Solution-processed printing techniques on flexible substrates attach a tremendous opportunity to the OPVs for the accomplishment of low-cost and large area applications. Furthermore, tandem architectures came to boost up even more OPVs by increasing the photon-harvesting properties of the device. In this work, we demonstrate the road of realizing flexible organic tandem solar modules constructed by a fully roll-to-roll compatible processing. The modules exhibit an efficiency of 5.4% with geometrical fill factors beyond 80% and minimized interconnection-resistance losses. The processing involves low temperature (<70 °C), coating methods compatible with slot die coating and high speed and precision laser patterning.

Original languageEnglish (US)
Title of host publicationOrganic Photovoltaics XV
EditorsZakya H. Kafafi, Paul A. Lane, Ifor D. W. Samuel
ISBN (Electronic)9781628412116
StatePublished - 2014
Externally publishedYes
EventOrganic Photovoltaics XV - San Diego, United States
Duration: Aug 19 2014Aug 21 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOrganic Photovoltaics XV
Country/TerritoryUnited States
CitySan Diego

Bibliographical note

Publisher Copyright:
© 2014 SPIE.


  • Flexible solar cells
  • Laser patterning
  • Organic solar modules
  • Organic tandem solar cells
  • Solution-processing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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