Dear Gholamhosain, the permittivity has to be established from experimental (or quantum-mechanical) sources, see for instance http://xplqa30.ieee.org/ielx5/5503869/6055237/6004802/html/img/6004802-fig-2-large.gif
This graph may be easily converted to numerical data using Engauge or similar program. Then I fit the curve manually by one (or few more) Lorentzian oscillators for the spectral region of interest. I put some interesting spectra on the page http://fzu.cz/~dominecf/misc/eps/, where also the data for the materials may be downloaded. But it will be surely easy to build a Lorentzian model for the photovoltaic materials. F. 2013/6/4, Gholamhosain Haidari <moh1...@gmail.com>: > *Hi all* > I am interested in meep for organic solar cell. > My problem is that I do not know the Drude-Lorentz parameter for regular > organic materilas (PEDOT:PSS and PCBM:P3HT, ITO) > Is there any program or code for finding Drude-Lorentz parameters from > experimental data (for example e1 and e2 ( e=e1 + ie2)). > All the best > *Thank you very much in advance* > moh > _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
