Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 87, Issue 1-4, Pages 251-259Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2004.07.025
Keywords
solar cells; tandem cells; amorphous silicon; microcrystalline silicon; tunnel recombination junction
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For amorphous and 'micromorph' silicon multi-junction solar cells, we have developed tunnel recombination junctions consisting of two microcrystalline doped layers with a defect-rich interface. While the solar cells performed reasonably well under AM 1.5 light, we found in spectral response measurements that the first deposited cell of tandem structures in nip and pin configuration was apparently leaking under low light conditions. Insertion of a thin protection layer of n-type amorphous silicon solved this issue, and led to an increase in open-circuit voltage. Voltages as high as 1.76 V have been obtained for a-Si/a-Si pinpin tandem cells. (c) 2004 Elsevier B.V. All rights reserved.
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