Modulated surface textures for enhanced light trapping in thin-film silicon solar cells

Substrates with a modulated surface texture were prepared by combining different interface morphologies. The spatial frequency surface representation method is used to evaluate the surface modulation. When combining morphologies with appropriate geometrical features, substrates exhibit an increased scattering level in a broad wavelength region. We demonstrate that the improved scattering properties result from a superposition of different light scattering mechanisms caused by the different geometrical features integrated in a modulated surface texture.

[1]  Miro Zeman.  Advanced Amorphous Silicon Solar Cell Technologies , 2006 .

[2]  P. Beckmann,et al.  The scattering of electromagnetic waves from rough surfaces , 1963 .

[3]  C. K. Carniglia,et al.  Scalar Scattering Theory for Multilayer Optical Coatings , 1979 .

[4]  G. Mie.  Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen , 1908 .

[5]  S. Guha,et al.  Triple-junction amorphous silicon alloy solar cell with 14.6% initial and 13.0% stable conversion efficiencies , 1997 .

[6]  Jef Poortmans,et al.  Thin Film Solar Cells: Fabrication, Characterization and Applications , 2006 .

[7]  J. Bennett,et al.  Introduction to Surface Roughness and Scattering , 1999 .

[8]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[9]  Christophe Ballif,et al.  Asymmetric intermediate reflector for tandem micromorph thin film silicon solar cells , 2009 .

[10]  Christophe Ballif,et al.  Optical management in high‐efficiency thin‐film silicon micromorph solar cells with a silicon oxide based intermediate reflector , 2008 .

[11]  J. Krč,et al.  Potential of thin-film silicon solar cells by using high haze TCO superstrates , 2010 .

[12]  P. A. van Nijnatten.  An automated directional reflectance/transmittance analyser for coating analysis , 2003 .

[13]  B. Rech,et al.  ZnO:Al films deposited by in-line reactive AC magnetron sputtering for a-Si:H thin film solar cells , 2006 .

[14]  Ihsanul Afdi Yunaz,et al.  ZnO Films with Very High Haze Value for Use as Front Transparent Conductive Oxide Films in Thin-Film Silicon Solar Cells , 2010 .

[15]  M. Zeman,et al.  Effect of surface roughness of ZnO:Al films on light scattering in hydrogenated amorphous silicon solar cells , 2003 .

[16]  H. Schade,et al.  Mie scattering and rough surfaces. , 1985, Applied optics.