I want to simulate the DSSC solar cells using Silvaco Atlas
.Required Parameters:
Non-radiative singlet exciton decay rate (s-1)-KNRS.EXCITON
Exciton diffusion length (nm)-LDS.EXCITON
Number of excitons generated for each absorbed photon- QE.EXCITON
Singlet exciton radiative decay lifetime (ns)- TAUS.EXCITON
Electron-hole separation distance in exciton (nm)- A.SINGLET
Singlet exciton binding energy (eV)- S.BINDING
Electron mobility (cm2 V-1s-1)
Hole mobility (cm2 V-1s-1)
Any literature review would be helpful.
Dear Md.
You can find this parameters for dies or organic materials which act as light absorber in the papers of numerical simulation of organic solar cells.
As an example please see the paper in the link: Article Simplified numerical simulation of organic photovoltaic devices
It is well known that every photon generates one exciton only so that the number of excitons generated by one photon is mostly equal to one.
The exciton diffusion length Lex is equal to the length of a polymer molecule in amorphous materials. So, it is of the order of 20 nm.
Electron hole separation distance R in the exciton depends on the binding energy Eb in the exciton which can be expressed by
Eb= q/4 pi epsilon R^2 with the units in eV electron volt. q and epsilon have their usual meaning. So, given Eb and epsilon one can calculate R.
If the diffusion coefficient Dexof the excitons is known one can calculate its recombination lifetime T ex= Lex^2/ Dex.
If the thickness of your material is equal or smaller than the the exciton diffusion length you can assume that all the excitons will succeed to reach the interface with between the donor acceptor material. And if the acceptor lumo level is below the lumo level of the donor almost all the excitos will be dissociated.
It is easy to find the mobility value of your material from the literature.
I discussed these issues in a recent paper on analytical modelling of the organic and perovskite solar cells. It will help you to understand the electronic processes in such devices: Conference Paper Generic Analytical Models for Organic and Perovskite Solar Cells
Best wishes
Dear Md.
You can find this parameters for dies or organic materials which act as light absorber in the papers of numerical simulation of organic solar cells.
As an example please see the paper in the link: Article Simplified numerical simulation of organic photovoltaic devices
It is well known that every photon generates one exciton only so that the number of excitons generated by one photon is mostly equal to one.
The exciton diffusion length Lex is equal to the length of a polymer molecule in amorphous materials. So, it is of the order of 20 nm.
Electron hole separation distance R in the exciton depends on the binding energy Eb in the exciton which can be expressed by
Eb= q/4 pi epsilon R^2 with the units in eV electron volt. q and epsilon have their usual meaning. So, given Eb and epsilon one can calculate R.
If the diffusion coefficient Dexof the excitons is known one can calculate its recombination lifetime T ex= Lex^2/ Dex.
If the thickness of your material is equal or smaller than the the exciton diffusion length you can assume that all the excitons will succeed to reach the interface with between the donor acceptor material. And if the acceptor lumo level is below the lumo level of the donor almost all the excitos will be dissociated.
It is easy to find the mobility value of your material from the literature.
I discussed these issues in a recent paper on analytical modelling of the organic and perovskite solar cells. It will help you to understand the electronic processes in such devices: Conference Paper Generic Analytical Models for Organic and Perovskite Solar Cells
Best wishes
Thank you @Abdelhalim Zekry for your explanation of each parameters. both of your suggested papers are helpful and I would try to validate my simulation with those data.
For basic information (NOT especially). You can use ''Farshad Farahbod'' papers in this regards.
Sincerely
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