Determining two-dimensional electron densities in AlGaN/GaN high electron mobility transistors using photoluminescence excitation
Abstract
GaN/AlGaN high electron mobility transistors (HEMTs) are important devices due to their high-frequency and high-power applications. The two-dimensional (2D) electron density in AlGaN/GaN heterostructures is essential for the design of the state-of-the-art HEMTs. Here, the electro-absorption of GaN/AlGaN HEMTs was investigated using photoluminescence excitation (PLE), which is a sensitive and noncontact optical technique. The built-in electric fields of the GaN and AlGaN layers in HEMTs were derived from the Stark effect in PLE. According to the discontinuity in the displacement electric fields, the 2D electron density in the heterostructures can be estimated from PLE, which agrees with the values obtained from the Hall-effect measurements.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (13)
Yu-Ting Chen
Ching-Hsueh Chiu
Department of Electronic Engineering, Chung Yuan Christian University 2 , Chung-Li 32023,
Lu-Hsun Chen
Department of Physics and Research Center for Semiconductor Materials & Advanced Optics, Chung Yuan Christian University 1 , Chung-Li 320314,
Chuan-Hsien Li
Department of Electronic Engineering, Chung Yuan Christian University 2 , Chung-Li 32023,
Chii-Bin Wu
Department of Physics and Research Center for Semiconductor Materials & Advanced Optics, Chung Yuan Christian University 1 , Chung-Li 320314,
Chi-Tsu Yuan
Department of Physics and Research Center for Semiconductor Materials & Advanced Optics, Chung Yuan Christian University 1 , Chung-Li 320314,
Wen-Yu Wen
Department of Physics and Research Center for Semiconductor Materials & Advanced Optics, Chung Yuan Christian University 1 , Chung-Li 320314,
Chiashain Chuang
Department of Electronic Engineering, Chung Yuan Christian University 2 , Taoyuan City 320,
Dung-Sheng Tsai
Department of Electronic Engineering, Chung Yuan Christian University 2 , Chung-Li 32023,
Yueh-Chien Lee
Department of Electronic Engineering, Lunghwa University of Science and Technology 3 , Guishan, Taoyuan County 333326,
Hertz Hsu
Wafer Works Corporation 4 , Taoyuan 32542,
Wei Jen Hsueh
Wafer Works Corporation 4 , Taoyuan 32542,
Ji-Lin Shen
Department of Physics and Research Center for Semiconductor Materials & Advanced Optics, Chung Yuan Christian University 1 , Chung-Li 320314,