4.7 Article

The effect of dislocations on the efficiency of InGaN/GaN solar cells

Journal

SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 117, Issue -, Pages 279-284

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2013.06.022

Keywords

GaN; InGaN; TEM characterization; EQE; Defects

Funding

  1. Engineering and Physical Sciences Research Council (EPSRC) UK, Science Bridge Award scheme
  2. EPSRC [EP/H019324/1, EP/G042330/1, EP/I012591/1] Funding Source: UKRI
  3. Engineering and Physical Sciences Research Council [EP/H019324/1, EP/G042330/1, EP/I012591/1] Funding Source: researchfish

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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 5 x 10(8) and 5 x 10(9) cm(-2). 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 TO 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 TO density sample was three times higher than that of the high TD density sample. (C) 2013 Elsevier B.V. All rights reserved.

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