Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment

碩士 === 國立交通大學 === 照明與能源光電研究所 === 103 === AlGaN/GaN HEMTs have high electron mobility, high saturation velocity and high breakdown, comparing with other electron device. AlGaN/GaN HEMTs have been wide applications for high frequency and high power densities. However, their performance is limited by c...

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Main Authors: Chang, Chia-Hao, 張家豪
Other Authors: Chang, Yi
Format: Others
Language:en_US
Published: 2014
Online Access:http://ndltd.ncl.edu.tw/handle/szuz3z
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spelling ndltd-TW-103NCTU53990062019-05-15T22:33:36Z http://ndltd.ncl.edu.tw/handle/szuz3z Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment 藉氮化鋁鈍化層與表面處理改善氮化鎵高電子遷移率電晶體 直流與高頻特性之研究 Chang, Chia-Hao 張家豪 碩士 國立交通大學 照明與能源光電研究所 103 AlGaN/GaN HEMTs have high electron mobility, high saturation velocity and high breakdown, comparing with other electron device. AlGaN/GaN HEMTs have been wide applications for high frequency and high power densities. However, their performance is limited by current collapse. The surface passivation layer has shown remarkable improvement in reducing the current collapse effect. Compared with those of SiNx, AlN thin film has a larger band-gap (6.2 eV), which can suppress traps to surface. DC and pulse IV measurement results are used to compare with AlGaN/GaN HEMTs with SiNx passivation layer .The results indicated that AlGaN/GaN HEMTs with AlN passivation layer, larger current-gain cutoff frequency (fT) and maximum oscillation frequency (fmax). Beside, small signal equivalent circuits are used to extract variation of intrinsic capacitance. AlGaN/GaN HEMTs with AlN passivation layer has small intrinsic capacitances. Complementary, the wet chemical treatments of AlGaN surface prior to deposition AlN passivation layer can reduce surface roughness and the presence of dangling bond (Ga-O). It can improve the device performance. Chang, Yi Maa, Jer-Shen 張翼 馬哲申 2014 學位論文 ; thesis 67 en_US
collection NDLTD
language en_US
format Others
sources NDLTD
description 碩士 === 國立交通大學 === 照明與能源光電研究所 === 103 === AlGaN/GaN HEMTs have high electron mobility, high saturation velocity and high breakdown, comparing with other electron device. AlGaN/GaN HEMTs have been wide applications for high frequency and high power densities. However, their performance is limited by current collapse. The surface passivation layer has shown remarkable improvement in reducing the current collapse effect. Compared with those of SiNx, AlN thin film has a larger band-gap (6.2 eV), which can suppress traps to surface. DC and pulse IV measurement results are used to compare with AlGaN/GaN HEMTs with SiNx passivation layer .The results indicated that AlGaN/GaN HEMTs with AlN passivation layer, larger current-gain cutoff frequency (fT) and maximum oscillation frequency (fmax). Beside, small signal equivalent circuits are used to extract variation of intrinsic capacitance. AlGaN/GaN HEMTs with AlN passivation layer has small intrinsic capacitances. Complementary, the wet chemical treatments of AlGaN surface prior to deposition AlN passivation layer can reduce surface roughness and the presence of dangling bond (Ga-O). It can improve the device performance.
author2 Chang, Yi
author_facet Chang, Yi
Chang, Chia-Hao
張家豪
author Chang, Chia-Hao
張家豪
spellingShingle Chang, Chia-Hao
張家豪
Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment
author_sort Chang, Chia-Hao
title Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment
title_short Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment
title_full Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment
title_fullStr Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment
title_full_unstemmed Study of DC and RF Characteristic Improvements on GaN HEMTs by AlN Passivation Layer and Surface Treatment
title_sort study of dc and rf characteristic improvements on gan hemts by aln passivation layer and surface treatment
publishDate 2014
url http://ndltd.ncl.edu.tw/handle/szuz3z
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