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Optical Engineering

Optical modeling of thin-film silicon solar cells by combination of the transfer-matrix method and the raytracer algorithm
Author(s): Cordula Walder; Juergen Lacombe; Karsten von Maydell; Carsten Agert
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Paper Abstract

We discuss an optical model which describes silicon thin-film solar cells with rough interfaces in a fast and easy way. In order to simulate thin layer stacks with rough interfaces diffuse scattering as well as interference effects have to be taken into account. Algorithms like the finite-difference time-domain method (FDTD) solve the Maxwell Equations, and therefore fulfil these demands; yet, they take a considerable amount of simulation time and computation capacity. To overcome these drawbacks, an optical model was developed which combines the transfer-matrix method (TMM) and the raytracer algorithm. The fraction of TMM and raytracer in the model is determined by a separating function which can be interpreted as the integral haze. In order to verify the combined optical model, a series of amorphous silicon single cells with varying intrinsic layer thicknesses was produced on two different kinds of textured substrates. The results of the combined optical model are compared to measured data and the simulation results of the FDTD method. We show that the combined optical model yields good results at low simulation time.

Paper Details

Date Published: 6 July 2012
PDF: 9 pages
Opt. Eng. 51(7) 073801 doi: 10.1117/1.OE.51.7.073801
Published in: Optical Engineering Volume 51, Issue 7
Show Author Affiliations
Cordula Walder, Next Energy (Germany)
Juergen Lacombe, Next Energy (Germany)
Karsten von Maydell, Next Energy (Germany)
Carsten Agert, Next Energy (Germany)

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