MRS Proceedings

Articles

Periodic textures for enhanced current in thin film silicon solar cells

2008 MRS Spring Meeting.

Franz-Josef Hauga1, Thomas Söderströma2, Oscar Cuberoa3, Vanessa Terrazzoni-Daudrixa4, Xavier Niquillea5, Stephanie Perregeauxa6 and Christophe Ballifa7

a1 franz-josef.haug@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, 2000 Neuchatel, Switzerland, Neuchatel, N/A, Switzerland, 41327183325

a2 thomas.soderstrom@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, Neuchatel, N/A, Switzerland

a3 oscar.cuber@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, Neuchatel, N/A, Switzerland

a4 vanessa.terrazzoni-daudrix@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, Neuchatel, N/A, Switzerland

a5 xavier.niquille@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, Neuchatel, N/A, Switzerland

a6 stephanie.perregeaux@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, Neuchatel, N/A, Switzerland

a7 ballif@unine.ch, University of Neuchatel, Institute of Microtechnology, Rue A.-L. Breguet 2, Neuchatel, N/A, Switzerland

Abstract

For thin film silicon solar cells it is vital to increase the optical path of light in the absorber because this allows for thinner cells with better stability and higher production throughput. We discuss the effect of periodically textured interfaces for the case of thin film silicon solar cells in n-i-p configuration using embossed plastic substrate which allows us studying the effect of a wide range of random or periodic textures. Due to the moderate thickness of the individual layers the texture is carried into each interface with a high degree of conformity even for the front contact which is the last layer. Solar cells on periodic structures show excellent performance; in a microcrystalline cell on a simple sinusoidal grating we achieved a gain in current density of 30%. Furthermore, the periodicity serves as a useful tool for the study of light management because the underlying phenomena like diffraction or grating coupling to plasma excitations of the metallic back reflector are governed by a relatively low number of well defined parameters like the periodicity and the amplitude of the grating.

(Received July 10 2008)

(Accepted July 12 2008)

Key Words

  • optical properties;
  • amorphous;
  • Si
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