期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 67, 期 1-4, 页码 145-150出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-0248(00)00274-9
关键词
solar cells; CIGS; band gap grading; high efficiency
High efficiencies in Cu(In,Ga)(S,Se)(2) solar cells result from alloying CuInSe2 base material with the corresponding Ga- or S-containing compound. Compositional grading is one important issue in these devices. To obtain high efficiencies a reconstructed Cu-depleted absorber surface is essential. We consider this Cu/In grading non-intentional, process related and present a model which explains its importance. Another approach to improve performance is controlled intentional band gap grading via Ga/In and S/Se grading during the deposition. We show that appropriate grading can improve current and voltage of the device simultaneously. The key objective is to design a larger band gap for recombination and a lower band gap for absorption to energetically separate the mechanisms of carrier recombination and current generation. (C) 2001 Elsevier Science B.V. All rights reserved.
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