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Strategy for tailoring the size distribution of nanospheres to optimize rough backreflectors of solar cells

 
: Nanz, S.; Abass, A.; Piechulla, P.M.; Sprafke, A.; Wehrspohn, R.B.; Rockstuhl, C.

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Volltext ()

Optics Express 26 (2018), Nr.2, S.A111-A123
ISSN: 1094-4087
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IMWS ()

Abstract
We study the light-trapping properties of surface textures generated by a bottom-up approach, which utilizes monolayers of densely deposited nanospheres as a template. We demonstrate that just allowing placement disorder in monolayers from identical nanospheres can already lead to a significant boost in light-trapping capabilities. Further absorption enhancement can be obtained by involving an additional nanosphere size species. We show that the Power Spectral Density provides limited correspondence to the diffraction pattern and in turn to the short-circuit current density enhancement for large texture modulations. However, in predicting the optimal nanosphere size distribution, we demonstrate that full-wave simulations of just a c-Si semi-infinite halfspace at a single wavelength in the range where light trapping is of main importance is sufficient to provide an excellent estimate. The envisioned bottom-up approach can thus reliably provide good light-trapping surface textures even with simple nanosphere monolayer templates defined by a limited number of control parameters: two nanosphere radii and their occurrence probability.

: http://publica.fraunhofer.de/dokumente/N-524930.html