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Effect of Crystalline Quality on Photovoltaic Performance for {\rm In}_{0.17}{\rm Ga}_{0.83}{\rm As} Solar Cell Using X-Ray Reciprocal Space Mapping

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4 Author(s)
Ming-Chun Tseng ; Dept. of Electro-Opt. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Ray-Hua Horng ; Dong-Sing Wuu ; Yang, Min-De

This paper presents the In0.17Ga0.83As solar cell grown on misoriented GaAs substrate (2°- and 15°-off) by metalorganic chemical vapor deposition. The crystalline quality of the In0.17Ga0.83As solar cell is determined by X-Ray reciprocal space mapping (RSM). RSM results show that the crystalline quality of In0.17Ga0.83As solar cell grown on 2°-off GaAs substrate is better than that of 15°-off GaAs substrate. Moreover, the photovoltaic performance of In0.17Ga0.83As solar cell grown on 2°-off GaAs substrate is found to be better than that of In0.17Ga0.83As solar cell grown on a 15°-off GaAs substrate, because the InxGa1-xAs epilayer grown on 15°-off GaAs substrate shows a large strain relaxation in the active layer of the solar cell. A large strain relaxation causes high dislocation density at the initial active layer/InxGa1-xAs graded layer interface for the solar cell grown on 15°-off GaAs substrate. The effect of dislocation defects on the solar cell performance can be alleviated using the p-i-n structure as the epilayer grown on 15°-off GaAs substrate.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:47 ,  Issue: 11 )

Date of Publication:

Nov. 2011

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