Double plasmonic structure design for broadband absorption enhancement in molecular organic solar cells

Wenli Bai, Qiaoqiang Gan, Guofeng Song, Lianghui Chen, Zakya Kafafi, Filbert Bartolia

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Absorption enhancement by a double plasmonic nanostructure in molecular organic photovoltaics (OPVs) is theoretically investigated. The structure consists of a periodic array of metal nanodiscs on one side of the OPV active layers and a thin metal nanohole array on the other side. Excitation of coupled modes of localized surface plasmon polaritons at the nanodiscs and short-range surface plasmon polaritons at the nanohole array causes the electromagnetic field to be highly concentrated within the organic active layers, leading to a polarizationindependent, broadband absorption enhancement in the visible and near-infrared portion of the solar spectrum. Calculations show that an optimized double plasmonic structure can enhance the total photon absorption by >125% for molecular OPVs based on a double heterojunction of an electron donor/hole transporter and an electron acceptor/transporter. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).
Original languageEnglish (US)
JournalJournal of Photonics for Energy
Volume1
Issue number1
DOIs
StatePublished - Dec 1 2011
Externally publishedYes

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Atomic and Molecular Physics, and Optics

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