Aggregates of plasmonic nanoparticles for broadband light trapping in dye-sensitized solar cells

Sharifi, N ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1088/2040-8978/18/1/015902
  3. Publisher: Institute of Physics Publishing , 2015
  4. Abstract:
  5. Metallic nanoparticles (NPs) have not been effective in improving the overall performance of the cells with micrometer-thick absorbing layers mainly due to the parasitic optical dissipation in the metal. Here, using both experiment and theory, we demonstrate that aggregates of metallic NPs enhance the light absorption of dye-sensitized solar cells of a few micrometer-thick light absorbing layers. The composite electrode containing the optimal concentration of 5 wt% Au@SiO2 aggregates shows the enhancement of 80% and 52% in external quantum efficiency and photocurrent density, respectively. The superior performance of the aggregates relative to NP is attributed to their larger scattering efficiency using full-wave optical simulations. This is further confirmed by optical spectroscopic measurements showing that a large fraction of the incident light couples into the diffused components because of the presence of these metallic aggregates. The optical absorption enhancement is broadband and it is particularly strong at wavelengths larger than 680 nm where the optical absorption of dye molecules is weak
  6. Keywords:
  7. Aggregates ; Efficiency ; Electromagnetic wave absorption ; Light absorption ; Light scattering ; Metal nanoparticles ; Metals ; Micrometers ; Nanoparticles ; Plasmons ; Solar cells ; Absorption enhancement ; External quantum efficiency ; Metallic nanoparticles ; Optical spectroscopic ; Optimal concentration ; Plasmonic nanoparticle ; Scattered field ; Scattering efficiency ; Dye-sensitized solar cells
  8. Source: Journal of Optics (United Kingdom) ; Volume 18, Issue 1 , November , 2015 ; 20408978 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/2040-8978/18/1/015902/meta;jsessionid=580214380FB8E513B1CD4B55F955CA3A.c4.iopscience.cld.iop.org