We demonstrate that SiGe solar cells with microscopic compositional distribution could improve the conversion efficiency of the multicrystalline Si solar cells. This improvement was revealed to come from the increase of the total current by a factor of 1.2, which originates from the increase of the internal quantum efficiency at relatively longer wavelength region. The decrease of the open circuit voltage was found to be not critical to affect the overall efficiency when the average Ge composition is lower than 5%. These results imply that SiGe solar cells could be a very promising candidate for new solar cells with higher efficiency, especially when low-cost growth technologies are exploited.
|Number of pages||7|
|Publication status||Published - 2004 Dec 1|
|Event||SiGe: Materials, Processing, and Devices - Proceedings of the First Symposium - Honolulu, HI, United States|
Duration: 2004 Oct 3 → 2004 Oct 8
|Other||SiGe: Materials, Processing, and Devices - Proceedings of the First Symposium|
|Period||04/10/3 → 04/10/8|
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