Please someone should help me on how to experimentally determination of refractive index and extinction coefficient of solar cell absorbing layer ?

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Shibghatullah Muhammady

Please use spectroscopic ellipsometry.

Xuhua Wang

You may find a method using UV-VIS spectrophotometer to do simple modelling more practical.

You could make thicker absorber films to measure the interference fringes for refractive index, and thinner films to get an extinction coefficient.

The technique is mentioned in the following publication.

https://www.researchgate.net/publication/265257853_Wang_XH_Grell_M_Lane_PA_Bradley_DDC_close_2001_Determination_of_the_linear_optical_constants_of_poly99-dioctylfluorene_Synthetic_Metals_Vol119_ISSN0379-6779_Pages535-536

Ammar Qasem

Please read the attached paper