I'm looking at characterizing the light intensity dependent performance of the solar cells. As a part of this work need to know if the effect of intensity dependent refractive index/ dielectric constant on the device absorption, and any saturation like effects on the optical absorption. If you can direct me to any literature or experimental datasets relevant to this topic that would be really helpful.
Thanks in advance.
Dear Waranatha,
welcome,
You excite an important topic which is the effect of nonlinear dielectric response on the absorption of light. The linear dielectric material has a dielectric consent which is independent of the applied electric field. However what can happen if they are subjected to very high intensity fields. The linearity may be no longer holds and one has to take it into consideration for predicting the correct behavior of the materials under strong electric field for example in case of very high intensity illumination with light.
For the nonlinear refractive index modelling you can see the paper in the link: https://arxiv.org/pdf/1702.04338
and for the absorption coefficient modelling you can follow the paper in the link:https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC)
Best wishes
Thank you for your answers!
Adding to my original question, how significant is the contribution due to change in the intensity dependent optical constants? I presume this should be quite small for low light intensities and in case of non absorptive materials the effects are negligible except for very high intensities.
what I'm looking for specifically is the intensity dependent performance of the solar cell absorber such as silicon or the active layer or an organic solar cell.
The contribution is absolutely insignificant for what you want to understand. If you want to get a feeling for the necessary intensities to generate significant non-linear effects see e.g.
http://scienceblogs.com/builtonfacts/2010/08/27/if-you-take-a-flashlight/
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