1 / 3

To overcome these issues, a “ dual-stage MQW ” structure was

To overcome these issues, a “ dual-stage MQW ” structure was proposed to enhance the electron injection and improve the crystalline quality of the overlying MQW. As an effort to do so, a triangular quantum well (TQW) structure

gervaise-odin
Télécharger la présentation

To overcome these issues, a “ dual-stage MQW ” structure was

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. To overcome these issues, a “dual-stage MQW” structure was proposed to enhance the electron injection and improve the crystalline quality of the overlying MQW. • As an effort to do so, a triangular quantum well (TQW) structure in the InGaN/GaN MQW active region has been recently proposed to weaken the polarization field. • In this paper, we propose a LED structure, named shallow TQW structure, to improve the emission property of LED devices.

  2. Experiments p-GaN layer： 200 nm , grown at 920℃ Active region ： three pairs InGaN/GaN MQW (2.7 nm/7.5 nm, grown at 745℃/865℃) with In% ＝ 16% in each InGaN well Si-doped n-GaN layer ： 3 μm , grown at 1050 ℃ Buffer layer ： low temperature, grown at 530 ℃ Sample A ： TQW structure Shallow QWs structure ： Sample B ： RQW structure Sample C ： without shallow QWs FIG. 1. (a) Schematic diagram of the epitaxial LEDs with the shallow QWs structure.

  3. (b) Schematic band profiles of the shallow QWs structure and the active region of LEDs with shallow TQW (Sample A), (c) LEDs with shallow RQW (Sample B), and (d) conventional LEDs (Sample C). Diagram is not to scale.

More Related