The Influence of a Piezoelectric Field on the Dynamic Performance of GaN-Based Green Light-Emitting Diodes With an InGaN Insertion Layer

NCUIR > College of Electrical Engineering & Computer Science > Department of Electrical Engineering > journal & Dissertation > Item 987654321/52112

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52112

Title:	The Influence of a Piezoelectric Field on the Dynamic Performance of GaN-Based Green Light-Emitting Diodes With an InGaN Insertion Layer
Authors:	Shi,JW;Kuo,FM;Huang,HW;Sheu,JK;Yang,CC;Lai,WC;Lee,ML
Contributors:	電機工程學系
Date:	2011
Issue Date:	2012-03-28 10:15:45 (UTC+8)
Publisher:	國立中央大學
Abstract:	In this letter, the mechanism for improvement of the dynamic performance of GaN-based light-emitting diodes with an InGaN insertion layer is investigated using the very fast electrical-optical pump-probe technique. Our measurements indicate that, when the bias current is relatively low (100 A/cm(2)), the device with the InGaN insertion layer (device A) exhibits a shorter response time than does the control (device B) without such a layer. However, when the bias current density reaches 0.5 kA/cm(2), devices A and B exhibit exactly the same response time during operation from room temperature to 200 degrees C. These results indicate that, under low current density (100 A/cm(2)), the piezoelectric (PZ) field inside device A will be stronger, which should result in a lower effective barrier height with a shorter carrier escape time than is the case for device B. On the other hand, under high bias current density, both devices have the same internal response time, which indicates the screening of the PZ field inside due to injected carriers. These dynamic measurement results suggest that the origin of the efficiency droop in our device under low and high bias current densities is carrier leakage and the Auger effect, respectively.
Relation:	IEEE ELECTRON DEVICE LETTERS
Appears in Collections:	[Department of Electrical Engineering] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	472	View/Open

社群 sharing

Loading...