Design considerations for a-Si solar cells

1 April 1980

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electron Devices

Vol. 27 (4) , 662-670
https://doi.org/10.1109/T-ED.1980.19920

Abstract

Amorphous Si (a-Si) is potentially an attractive material for thin-film solar cells. However, its potential for high-efficiency devices to date has not been realized. In this paper, we examine the design considerations which can be used to develop high-efficiency devices from a-Si. The design analysis takes full advantage of the flexibility in bandgap and other material properties offered by a-Si. Several structures, such as light-trapped cells, graded layer cells, and tandem junction a-Si/a-Si cells are analyzed in detail for collection efficiency, Voc, and fill factors. It is shown that using these innovative structures, realistic conversion efficiencies exceeding 10 percent can be realized in a-Si in spite of the very low diffusion lengths (∼0.1 µm). Technological considerations for achieving such structures are also discussed.

Keywords

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