Computer-aided design of multilayer-structure Ga1-xAIxAS-GaAs Solar cells

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Computer-aided design of multilayer-structure Ga1-xAIxAS-GaAs Solar cells

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© The Institution of Electrical Engineers
Published

The spectral response, the voltage and current that give maximum power, and the conversion efficiency have all been calculated for Ga1-xAlxAs/p-GaAs/n-GaAs solar cells that have multilayer GaAlAs windows on their surfaces. In the numerical analysis, photo-generated carrier collection in the window layers was considered. The spectral response in the short-wavelength region could be improved if either the Al composition factor x of the window layer was made larger or the window was made thinner. The lifetime of the carriers in the p-GaAs layer is especially important for improving the spectral response and the conversion efficiency. The increases of donor concentration in the n-GaAs bulk region and of acceptor concentration in the p-GaAs layer cause the current and voltage to increase. Thus the multilayer structures can make efficient use of the short-wavelength region of the spectrum and be easier to produce than a continuously graded structure. Conversion efficiencies can be approximately 20% in AMO.

Inspec keywords: solar cells; CAD

Other keywords: acceptor concentration; multilayer structures; Ga1-xAlxAs-GaAs solar cells; carrier lifetime; multilayer GaAlAs windows; spectral response; conversion efficiency; photogenerated carrier collection; donor concentration

Subjects: Solar cells and arrays; Optoelectronics manufacturing; Electronic engineering computing; Design; Photoelectric conversion; solar cells and arrays; Photoelectric devices

References

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