Numerical simulation of innovative device structures for silicon thin-film solar cells

We investigate the optical and electronic properties of thin-film silicon solar cells by means of numerical simulations. The optical design under investigation is the encapsulated-V texture which is capable of absorbing sunlight corresponding to a maximum short circuit current density of 35 mA/cm/su...

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Bibliographic Details
Main Authors: Rau, U., Meyer, T., Goldbach, A., Brendel, R., Werner, J.H.
Format: Conference Proceeding
Language:English
Subjects:
Charge carrier lifetime
Charge carriers
Numerical simulation
Optical design
Optical films
Photovoltaic cells
Semiconductor thin films
Short circuit currents
Silicon
Thin film circuits
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Summary:We investigate the optical and electronic properties of thin-film silicon solar cells by means of numerical simulations. The optical design under investigation is the encapsulated-V texture which is capable of absorbing sunlight corresponding to a maximum short circuit current density of 35 mA/cm/sup 2/. Since the layer thickness can be restricted to only 4 /spl mu/m, the encapsulated-V structure provides also a good collection efficiency for photogenerated charge carriers. Practical efficiencies around 12% can be expected for Si material with a minority carrier lifetime as low as 10 ns. Increased lifetimes of 100 ns allow for about 14% efficiency. The benefit of multiple junctions strongly depends on surface recombination. The efficiency of a single junction cell can be improved from 10% to 13% by a three junction device if the surface recombination velocity is as high as 10/sup 5/ cm/s. For moderate surface recombination the gain is only 1%.
ISSN:0160-8371
DOI:10.1109/PVSC.1996.564045