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Surface Plasmon Assisted Absorption in Conjugated Polymer Thin Films and Devices
D.M. O'Carroll, A.X. Collopy, V.E. Ferry, H.A. Atwater
Organic Solar Cell, Nanoparticle, Absorption
Advanced Photovoltaics: New Concepts and Ultra-high Efficiency
Subtopic: Organic-based PV
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 1DV.4.55
834 - 837
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-1DV.4.55
0,00 EUR
Document(s): paper


Here, we investigate the use of Ag nanoparticle array electrodes on the optical characteristics of polythiophene semiconductor thin films and photovoltaic devices both experimentally and theoretically. Nanostructured electrodes are fabricated by evaporation of Ag through nanoporous alumina masks, and subsequent removal of the alumina. The evolution of reflected light spectra from the devices, as a function of nanoparticle height is studied experimentally and using finite-difference-time-domain simulations. Absorption in the active layer is enhanced by factors of 5-10 in the 570 to 750 nm wavelength range at the red of the polythiophene absorption band using nanoparticles with height:diameter aspect ratios of more than 1. Additionally, the enhanced absorption leads to improved red response in the photocurrent spectra of fabricated test devices.