Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9830089 | Journal of Crystal Growth | 2005 | 7 Pages |
Abstract
We investigated structural properties of polycrystalline SiGe grown by directional growth method for solar cells. The average Ge composition was systematically changed in the range between 0 and 10Â at%. Distributions of concentration and crystallographic orientation in the SiGe crystal were measured and the preferential growth orientation was found to change from (1Â 1Â 1) to (1Â 1Â 0) with increasing average Ge composition. Misfit dislocation was observed using transmission electron microscope. There was few dislocations in SiGe crystals when the average Ge composition was between 0 and 5Â at% though a lot of dislocations existed at the average Ge composition of 10Â at%. We concluded that the optimum Ge composition is around 5Â at% for solar cells.
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Authors
Kozo Fujiwara, Wugen Pan, Noritaka Usami, Kohei Sawada, Akiko Nomura, Toru Ujihara, Toetsu Shishido, Kazuo Nakajima,