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Photoelectric conversion; solar cells and arrays

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  • Physics [3]
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  • 1977 [3]

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Crystal-violet/tin-oxide solar cell
Author(s): E.W. Williams
Source: IEE Journal on Solid-State and Electron Devices, Volume 1, Issue 6, 1977 , p. 185 - 192
Type: Article
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The crystal-violet/tin-oxide solar cell which has been reported briefly in a recent patent was tested for u.v. stability under a variety of chemical conditions, and, in every case, was found to be unstable. Degradation effects produced by chemical reactions are strongly indicated by absorption and action spectra as the pH of the cell was varied. The p-n junction model is rejected for this type of crystal-violet/tin-oxide heterojunction cell. The potential of organic solar cells based on a dye-oxide semiconductor junction for cheap, lightweight and large-area devices is discussed, and some of the possible materials are reviewed.

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Computer-aided design of multilayer-structure Ga1-xAIxAS-GaAs Solar cells
Author(s): Akira Usami, Yoshihiko Hamamoto
Source: IEE Journal on Solid-State and Electron Devices, Volume 1, Issue 6, 1977 , p. 182 - 184
Type: Article
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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.

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Influence of junction roughness on solar-cell characteristics
Author(s): G. de Mey, B. Jacobs, F. Fransen
Source: Electronics Letters, Volume 13, Issue 22, October 1977, p. 657 - 658
Type: Article
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Most theoretical investigations of solar cells use a 1-dimensional model for the calculation of the minority-carrier concentration and the characteristics. However, if the surface of the junction is no longer flat, a more-dimensional analysis will, be necessary. A numerical 2-dimensional analysis based on an integral-equation technique is presented to solve the problem.

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