The two files are photocurrent pictures of silicon solar cell with pyramid and without by Silvaco TCAD. Compared with the picture wihout pyramid, the red line is not parallel the greent line at the point that the wavelength is 500nm. I want to konw the reason？ I try to increase silicon thickness, however, this is not a reason. Please giving me answers! Great Masters.Thanks!
Dear Wang Triumph ,
At first you would like to define the different currents.
The other issue is that the effect of surface texturing is very clear. It enhances the absorbed light in the range of the shorter wavelengths of the spectrum while it seems to to increase the reflectance at the longer wavelength.
I think the matter of the penalization is not the big issue.
From my point of view you must change the representation of your data to represent the spectral response of the cell with and without the pyramid.
where you draw Icathode /I source.
You need also to determine the spectral reflectance with and without the pyramid.
In this way you can explain your results!
Best wishes
Texturing of surface of silicon solar cell effects well on photoelectric parameters of solar cells. Photo current increase in visible region of solar spectrum, because of textures decrease the absorption length, reflection and transmission coefficients, as well as increase the absorption coefficient. There are some disadvantages in creating textures on the surface of solar cells. First, the surface recombination is increased due to enlarging of surface. Therefore, source photo current will not be parallel to available photo current after texturing.
What is period of the pyramids? Can it be around 1000nm? - then they effectively form waveguide with cut-off (max propagating) wavelength of 1000nm/2
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