Influence of an InGaN superlattice pre-layer on the performance of semi-polar (11–22) green LEDs grown on silicon

X. Zhao, K. Huang, J. Bruckbauer, S. Shen, C. Zhu, P. Fletcher, P. Feng, Y. Cai, J. Bai, C. Trager-Cowan, R. W. Martin, T. Wang

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Abstract

It is well-known that it is crucial to insert either a single InGaN underlayer or an InGaN superlattice (SLS) structure (both with low InN content) as a pre-layer prior to the growth of InGaN/GaN multiple quantum wells (MQWs) served as an active region for a light-emitting diode (LED). So far, this growth scheme has achieved a great success in the growth of III-nitride LEDs on c-plane substrates, but has not yet been applied in the growth of any other orientated III-nitride LEDs. In this paper, we have applied this growth scheme in the growth of semi-polar (11–22) green LEDs, and have investigated the impact of the SLS pre-layer on the optical performance of semi-polar (11–22) green LEDs grown on patterned (113) silicon substrates. Our results demonstrate that the semi-polar LEDs with the SLS pre-layer exhibit an improvement in both internal quantum efficiency and light output, which is similar to their c-plane counterparts. However, the performance improvement is not so significant as in the c-plane case. This is because the SLS pre-layer also introduces extra misfit dislocations for the semi-polar, but not the c-plane case, which act as non-radiative recombination centres.

Original languageEnglish
Article number12650
Number of pages8
JournalScientific Reports
Volume10
DOIs
Publication statusPublished - 28 Jul 2020

Keywords

  • light-emitting diode (LED)
  • III-nitride LEDs
  • semi-polar LEDs
  • performance

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