Collection of Photocarriers in Ga{sub X}In{sub 1-x}N{sub Y}As{sub 1-y} Solar Cells
Auteur : R. R. King, S. Kurtz, D. C. Law, J. F. Geisz, D. J. Friedman, N. H. Karam, A. J. Ptak
Date de publication : 2005
Éditeur : United States. Department of Energy
Nombre de pages : 7
Résumé du livre
Collection of photocarriers in Ga{sub x}In{sub 1-x}N{sub y}As{sub 1-y} solar cells is limited by the poor quality of the Ga{sub x}In{sub 1-x}N{sub y}As{sub 1-y}. Some reports have shown collection of photocarriers outside of the depleted layer in annealed Ga{sub x}In{sub 1-x}N{sub y}As{sub 1-y}, but the key to achieving the higher collection has been unclear. In this paper, we attempt to quantify the diffusion and collection lengths that contribute to the photocurrent in Ga{sub x}In{sub 1-x}N{sub y}As{sub 1-y} solar cells. The data imply that the effective {mu}{tau} product for the lightly doped Ga{sub x}In{sub 1-x}N{sub y}As{sub 1-y} material may vary when a field is applied. We conclude that the fields present in most of our best Ga{sub x}In{sub 1-x}N{sub y}As{sub 1-y} cells are large enough to aid collection of photocarriers.