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Effects of Substrate Orientation on the Photovoltaic Performance of InGaAs Solar Cells

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7 Author(s)
Ming-Chun Tseng ; Inst. of Electro-Opt. & Mater. Sci., Nat. Formosa Univ., Huwei, Taiwan ; Ray-Hua Horng ; Snin-Nan Lin ; Dong-Sing Wuu
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In0.16Ga0.84As solar cells grown on GaAs substrates with different miscut angles via metalorganic chemical vapor deposition were utilized to study the effect of substrate orientation on solar cell efficiency. A p-n In0.16Ga0.84As solar cell grown on a 2°-off GaAs substrate exhibited better conversion efficiency than one grown on a 15°-off GaAs substrate. The poor performance of the 15°-off In0.16Ga0.84As solar cell could be attributed to the formation of high-density misfit dislocations through strain relaxation, thereby reducing the minority carrier lifetime. The conversion efficiency of a 15°-off In0.16Ga0.84As solar cell was improved using a p-i-n structure. Using the p-i-n structure design, a 15°-off In0.16Ga0.84As solar cell showed conversion efficiency close to or even better than that of a 2°-off In0.16Ga0.84As solar cell with the same structure.

Published in:

Electron Devices, IEEE Transactions on  (Volume:57 ,  Issue: 9 )

Date of Publication:

Sept. 2010

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