Structural and optical study of core–shell InGaN layers of nanorod arrays with multiple stacks of InGaN/GaN superlattices for absorption of longer solar spectrum

• Si-Young Bae

• Byung Oh Jung

• Kaddour Lekhal

• Dong-Seon Lee

• Manato Deki

• Yoshio Honda

• Hiroshi Amano

Abstract

We report on the material and optical properties of core–shell InGaN layers grown on GaN nanorod arrays. The core–shell InGaN layers were well grown on polarization-reduced surfaces such as semipolar pyramids and nonpolar sidewalls. In addition, to compensate the biaxial strain between GaN and InGaN layers, we grew interlayers underneath a thick InGaN layer. Here, the interlayers were composed of multiple superlattice structures. We could observe that the indium composition of core–shell InGaN structures increased with the number of interlayers. This indicates that the absorption energy band of InGaN alloys can be better matched to the spectral irradiance of the solar spectrum in nature. We also implemented a simulation of Ga-polar and nonpolar InGaN-based solar cells based on the indium composition obtained from the experiments. The result showed that nonpolar InGaN solar cells had a much higher efficiency than Ga-polar InGaN solar cells with the same thickness of the absorption layer.

Journal

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 55 (5S), 05FG03-, 2016-04-01

  IOP Publishing

Keywords

• General Physics and Astronomy
• General Engineering

Details

• CRID: 1360847874820664704
• NII Article ID: 210000146528
• DOI: 10.7567/jjap.55.05fg03
• ISSN: 13474065
• ISSN: 00214922
• Web Site: http://stacks.iop.org/1347-4065/55/i=5S/a=05FG03/pdf
• Web Site: http://stacks.iop.org/1347-4065/55/i=5S/a=05FG03?key=crossref.320c1b091bb94f3d89fb23b95172e25b
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.05FG03
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.05FG03/pdf
• Data Source:
  • Crossref
  • CiNii Articles
  • KAKEN