Enhancement of light harvesting in flexible photovoltaics

Ying Liu, Michelle Casper, Omer Gozen, Sharvil Desai, Ethan Klem, Jay Lewis, Jan Genzer, Jon Paul Maria, Michael D. Dickey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This talk describes a simple, low-cost technique to improve light harvesting in thin-film photovoltaics. Spontaneous surface buckling is a low-cost strategy for producing hierarchically corrugated surfaces while avoiding lithographic patterning and is attractive for use in mechanically flexible, thin-film technologies. Our studies use organic photovoltaics (OPVs) as model systems and our preliminary results suggest that thin film photovoltaic efficiencies experience improvements when prepared on corrugated topographies, which is supported by recent theories of light trapping in solar cells. Thus, understanding the origins of buckling instabilities and controlling such topographies is of importance for the engineering of functional textured surfaces. We investigate the origins of buckling instabilities in indium tin oxide (ITO) - polymer multilayer systems and explore strategies for controlling the morphology with the potential for reversibility and tunability. We identify the key processing parameters and also identify several origins of stress generation. By varying the thickness of the ITO and polymer layers we can prepare buckled topographies with characteristic wavelengths of 2-12 μm. We have deposited known absorber materials onto both buckled and planar surfaces and investigated the change in absorbance. Preliminary results of organic solar cells fabricated on buckled ITO/PS indicate a 20% greater power conversion efficiency compared to a comparable planar device.

Original languageEnglish (US)
Title of host publication11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2011
Event2011 AIChE Annual Meeting, 11AIChE - Minneapolis, MN, United States
Duration: Oct 16 2011Oct 21 2011

Publication series

Name11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings

Other

Other2011 AIChE Annual Meeting, 11AIChE
CountryUnited States
CityMinneapolis, MN
Period10/16/1110/21/11

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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  • Cite this

    Liu, Y., Casper, M., Gozen, O., Desai, S., Klem, E., Lewis, J., Genzer, J., Maria, J. P., & Dickey, M. D. (2011). Enhancement of light harvesting in flexible photovoltaics. In 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings (11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings).