Electroluminescence enhancement of SiGe/Si multiple quantum wells through nanowall structures

T T Chen; Y P Hsieh; C M Wei; Y F Chen; L-C Chen; K-H Chen; Y H Peng; C H Kuan

doi:10.1088/0957-4484/19/36/365705

Electroluminescence enhancement of SiGe/Si multiple quantum wells through nanowall structures

Nanotechnology. 2008 Sep 10;19(36):365705. doi: 10.1088/0957-4484/19/36/365705. Epub 2008 Jul 28.

Authors

T T Chen¹, Y P Hsieh, C M Wei, Y F Chen, L-C Chen, K-H Chen, Y H Peng, C H Kuan

Affiliation

¹ Department of Physics, National Taiwan University, Taipei 106, Taiwan.

PMID: 21828886
DOI: 10.1088/0957-4484/19/36/365705

Abstract

The enhancement of light extraction from Si(0.5)Ge(0.5)/Si multiple quantum wells (MQWs) with nanowall structures fabricated by electron cyclotron resonance (ECR) plasma etching is presented. It is shown that the ECR plasma treatment does not damage the crystalline quality. At a driving current of 5.5 × 10(6) A m(-2), the light output intensity of the MQWs with nanowall structures shows an enhancement of about 50% compared with that of the original MQWs. In addition to the enhanced light extraction, the improved optoelectronic properties are also attributed to the strain relaxation in nanowall structures.