Exploration of parameters influencing the self-absorption losses in luminescent solar concentrators with an experimentally validated combined ray-tracing/Monte-Carlo model

Z. Krumer, W.G.J.H.M. van Sark, C. de Mello Donegá, R.E.I. Schropp

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

5 Citations (Scopus)

Abstract

Luminescent solar concentrators (LSCs) are low cost photovoltaic devices, which reduce the amount of necessary semiconductor material per unit area of a photovoltaic solar energy converter by means of concentration. The device is comprised of a thin plastic plate in which luminescent species (fluorophores) have been incorporated. The fluorophores absorb the solar light and radiatively re-emit a part of the energy. Total internal reflection traps most of the emitted light inside the plate and wave-guides it to a narrow side facet with a solar cell attached, where conversion into electricity occurs. The eficiency of such devices is as yet rather low, due to several loss mechanisms, of which self-absorption is of high importance. Combined ray-tracing and Monte-Carlo simulations is a widely used tool for eficiency estimations of LSC-devices prior to manufacturing. We have applied this method to a model experiment, in which we analysed the impact of self-absorption onto LSC- eficiency of fluorophores with different absorption/emission-spectral overlap (Stokes-shift): several organic dyes and semiconductor quantum dots (single compound and core/shell of type-II). These results are compared with the ones obtained experimentally demonstrating a good agreement. The validated model is used to investigate systematically the influence of spectral separation and luminescence quantum eficiency on the intensity loss in consequence of increased self-absorption. The results are used to adopt a quantity called the self-absorption cross-section and establish it as reliable criterion for self-absorption properties of materials that can be obtained from fundamental data and has a more universal scope of application, than the currently used Stokes-shift.

Original languageEnglish
Title of host publicationHigh and low copncetrator systems for solar electric applications VIII
EditorsA.P. Plesniak
DOIs
Publication statusPublished - 2013
EventHigh and Low Concentrator Systems for Solar Electric Applications VIII - San Diego, CA, United States
Duration: 27 Aug 201327 Aug 2013

Publication series

NameProceedings of Spie
Volume8821

Conference

ConferenceHigh and Low Concentrator Systems for Solar Electric Applications VIII
CountryUnited States
CitySan Diego, CA
Period27/08/1327/08/13

Keywords

  • luminescent solar concentrators
  • Monte- Carlo simulations
  • ray-tracing simulations
  • re-absorption
  • self-absorption

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