Influence of the ZnO buffer layer on the guided mode structure in Si/ZnO/Ag multilayers

We present a study of the optical mode structure in metal-dielectric multilayer structures that represent amorphous silicon thin film solar cells with metallic back contact. Knowledge of the modal structure represents a first step toward describing absorption enhancement by the interface texture in solar cells. We present a method for determining experimentally the dispersion relations of multilayer films by coupling polarized light in a spectral reflection measurement to eigenmodes, using a one-dimensional sinusoidal grating. Because the used grating represents only a minor perturbation that establishes the coupling, the experimental data is well explained by the modal structure of a geometry with flat interfaces. On the basis of the measured mode structure, we propose an explanation for the beneficial effect of a low index buffer layer between the silicon absorber and the metallic back reflector. © 2009 American Institute of Physics.


Published in:
Journal of Applied Physics, 106, 044502
Year:
2009
Keywords:
Note:
IMT-NE Number: 511
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2010-01-28, last modified 2018-03-17

n/a:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)