Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6536253 | Solar Energy Materials and Solar Cells | 2013 | 6 Pages |
Abstract
Two solar cells based on an InGaN/GaN p-i-n hetero-junction, but having different dislocation densities, were fabricated and characterized. The structures were grown on c-plane (0001) GaN-on-sapphire templates with different threading dislocation (TD) densities of 5Ã108 and 5Ã109Â cmâ2. Structural characterization revealed the presence of V-defects in the InGaN epilayer. Since each V-defect was associated with a TD, the structural as well as the optical properties worsened with a higher TD density in the GaN/sapphire template. It was also found that additional dislocations were generated in the p-GaN layer over the V-defects in the InGaN layer. Because of its superior structural quality, the peak external quantum efficiency (EQE) of the low TD density sample was three times higher than that of the high TD density sample.
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Authors
Y. Zhang, M.J. Kappers, D. Zhu, F. Oehler, F. Gao, C.J. Humphreys,