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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S1 — Jan. 13, 2014
  • pp: A53–A67

Analytical solution for haze values of aluminium-induced texture (AIT) glass superstrates for a-Si:H solar cells

Nasim Sahraei, Karen Forberich, Selvaraj Venkataraj, Armin G. Aberle, and Marius Peters  »View Author Affiliations


Optics Express, Vol. 22, Issue S1, pp. A53-A67 (2014)
http://dx.doi.org/10.1364/OE.22.000A53


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Abstract

Light scattering at randomly textured interfaces is essential to improve the absorption of thin-film silicon solar cells. Aluminium-induced texture (AIT) glass provides suitable scattering for amorphous silicon (a-Si:H) solar cells. The scattering properties of textured surfaces are usually characterised by two properties: the angularly resolved intensity distribution and the haze. However, we find that the commonly used haze equations cannot accurately describe the experimentally observed spectral dependence of the haze of AIT glass. This is particularly the case for surface morphologies with a large rms roughness and small lateral feature sizes. In this paper we present an improved method for haze calculation, based on the power spectral density (PSD) function of the randomly textured surface. To better reproduce the measured haze characteristics, we suggest two improvements: i) inclusion of the average lateral feature size of the textured surface into the haze calculation, and ii) considering the opening angle of the haze measurement. We show that with these two improvements an accurate prediction of the haze of AIT glass is possible. Furthermore, we use the new equation to define optimum morphology parameters for AIT glass to be used for a-Si:H solar cell applications. The autocorrelation length is identified as the critical parameter. For the investigated a-Si:H solar cells, the optimum autocorrelation length is shown to be 320 nm.

© 2013 Optical Society of America

OCIS Codes
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(240.5770) Optics at surfaces : Roughness
(290.0290) Scattering : Scattering
(290.5835) Scattering : Scattering, Harvey

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: September 23, 2013
Revised Manuscript: November 7, 2013
Manuscript Accepted: November 8, 2013
Published: November 27, 2013

Citation
Nasim Sahraei, Karen Forberich, Selvaraj Venkataraj, Armin G. Aberle, and Marius Peters, "Analytical solution for haze values of aluminium-induced texture (AIT) glass superstrates for a-Si:H solar cells," Opt. Express 22, A53-A67 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S1-A53


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