Dear Othmane,

welcome!

What do you mean with refractive index expansion on solar cells? Do you mean to grade the refractive index from that of air to that of silicon gradually instead of using one layer of anti reflective coating. If this is the case, such refractive index grading will improve reduce the reflectance to a much less value. The direct consequence of this is to increase the photoconversion efficiency of the solar cells. Such grading of the refractive index is becoming possible by the nano materials which changes the surface to good absorbing state.

You may look at the paper in the link: Article Improving Crystalline Silicon Solar Cell Efficiency Using Gr...

Best wishes

Deng, Chun, and Hyungson Ki. "Pulsed laser deposition of refractive-index-graded broadband antireflection coatings for silicon solar cells." Solar Energy Materials and Solar Cells 147 (2016): 37-45.

This link might be helpful

https://www.pveducation.org/pvcdrom/design-of-silicon-cells/optical-losses

Transparency and light scattering effect possibly

Dear Othmane,

welcome!

What do you mean with refractive index expansion on solar cells? Do you mean to grade the refractive index from that of air to that of silicon gradually instead of using one layer of anti reflective coating. If this is the case, such refractive index grading will improve reduce the reflectance to a much less value. The direct consequence of this is to increase the photoconversion efficiency of the solar cells. Such grading of the refractive index is becoming possible by the nano materials which changes the surface to good absorbing state.

You may look at the paper in the link: Article Improving Crystalline Silicon Solar Cell Efficiency Using Gr...

Best wishes

Dear Abdelhalim abdelnaby Zekry

I did a calculation of the refraction index of the absorber CuO thin films, I found an increase in n from 2.88 to 2.96, I would like to know what is the effect of the expansion of the refraction index in solar cells application ?

thank you

Dear Othmane,

For effective antireflective coating there is a relation ship for the best antirefelective function. This relation is

n of the antireflective coating functions = sqroot of ( nair x n solar cell materials)

I do not know what is that layer used for? So i assumed that you will use it for antireflective coating. Therefore , i brought you the matching condition for the antireflective coating above.

For more information about this condition please follow the link: Chapter Solar cells and arrays: Principles, analysis and design

Best wishes

Dear Othmane Daoudi

not sure if this helps:

Article Refractive indices of layers and optical simulations of Cu(I...

Increasing the refractive index means narrowing the band gap of the material which helps solar cell to respond more in higher wavelength region of the solar specturm.