The impact of intermediate reflectors on light absorption in tandem solar cells with randomly textured surfaces

Rockstuhl, C.; Lederer, F.; Bittkau, K.; Beckers, T.; Carius, R.
May 2009
Applied Physics Letters;5/25/2009, Vol. 94 Issue 21, p211101
Academic Journal
The impact of dielectric intermediate reflectors on the light absorption in the top cell of an a-Si:H/μc-Si:H tandem solar cell comprising randomly textured surfaces was investigated by rigorous diffraction theory. Despite the strong light scattering, we found Fabry–Pérot oscillations for the absorption with a decreasing modulation for an increasing thickness of the intermediate layer, a larger oscillation period when compared to thin films and a homogenization of the absorption profile. Optimized intermediate reflectors generate an absorption enhancement in the a-Si:H film, which varies between a factor of 2 and more than 3 for wavelengths of strong and weak absorption, respectively.


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