Enhanced power conversion efficiency of organic solar cells by embedding Ag nanoparticles in exciton blocking layer

Inho Kim, Tyler Fleetham, Hyung Woo Choi, Jea Young Choi, Taek Sung Lee, Doo Seok Jeong, Wook Seong Lee, Kyeong Seok Lee, Yong Kyun Lee, Terry Alford, Jian Li

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We demonstrate the power conversion efficiency of bulk heterojunction organic solar cells can be enhanced by introducing Ag nanoparticles into organic exciton blocking layer. The Ag nanoparticles were incorporated into the exciton blocking layer by thermal evaporation. Compared with the conventional cathode contact materials such as Al, LiF/Al, devices with Ag nanoparticles incorporated in the exciton blocking layer showed lower series resistances and higher fill factors, leading to a 3.2% power conversion efficiency with a 60 nm active layer; whereas, the conventional devices have only 2.0-2.3% power conversion efficiency. Localized surface plasmon resonances by the Ag nanoparticles and their contribution to photocurrent were also discussed by simulating optical absorptions using a FDTD (finite-difference-time-domain) method.

Original languageEnglish (US)
Pages (from-to)2414-2419
Number of pages6
JournalOrganic Electronics
Volume15
Issue number10
DOIs
StatePublished - Oct 2014

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Keywords

  • Ag nanoparticle
  • Exciton blocking layer
  • Organic solar cells
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Kim, I., Fleetham, T., Choi, H. W., Choi, J. Y., Lee, T. S., Jeong, D. S., Lee, W. S., Lee, K. S., Lee, Y. K., Alford, T., & Li, J. (2014). Enhanced power conversion efficiency of organic solar cells by embedding Ag nanoparticles in exciton blocking layer. Organic Electronics, 15(10), 2414-2419. https://doi.org/10.1016/j.orgel.2014.06.020