Thermal characterisation and analysis of GaN power devices

The main objective of this final year project is to do thermal analysis of the high-voltage AlGaN/GaN high-electron-mobility transistors (HEMTs) on Silicon (Si), Silicon Carbide (SiC) and CVD-Diamond (Dia) substrate. The measurements in this project were all done on fabricated 0.25 µm gate CPW GaN H...

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Main Author: Wirna
Other Authors: Ng Geok Ing
Format: Final Year Project
Language:English
Published: 2018
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Online Access:http://hdl.handle.net/10356/76291
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-762912023-07-07T17:13:57Z Thermal characterisation and analysis of GaN power devices Wirna Ng Geok Ing School of Electrical and Electronic Engineering Temasek Laboratories @ NTU DRNTU::Engineering::Electrical and electronic engineering The main objective of this final year project is to do thermal analysis of the high-voltage AlGaN/GaN high-electron-mobility transistors (HEMTs) on Silicon (Si), Silicon Carbide (SiC) and CVD-Diamond (Dia) substrate. The measurements in this project were all done on fabricated 0.25 µm gate CPW GaN HEMTs on Si, SiC and Dia substrate. In this work, electrical and pulse measurements of the HEMTs were done and it was observed that GaN-on-Si device has largest current reduction, GaN-on-Dia has the lowest current reduction with GaN-on-SiC in between. After which, junction temperature measurements were carried out. It was found that GaN-on-Si device has the largest delta temperature increase as compared to the other two substrates and GaN-on-Dia has the smallest delta temperature increase. This shows that Silicon device has the largest device self-heating due to the lowest thermal conductivity. Diamond substrate having the highest thermal conductivity, the self-heating of the device is lowest. Finally, the lifetime of both Silicon and Silicon Carbide substrate devices from the degradation rate derived from short term step temperature stress test was evaluated. Instead of using the conventional failure rate to calculate the activation energy, the rates of drain current degradation of Silicon and Silicon Carbide devices were used. With the activation energy plot, the lifetime can be derived from any junction temperature. With the same output power and similar bias conditions, Device fabricated on Silicon Carbide had cooler junction temperature than Silicon. This in turn resulted in slower degradation rate and longer device lifetime. Studies on different types of substrates to achieve the best performance is increasing. Most of the studies are to explore the types of substrate that allow quick dissipation of heat under high power application, to enable high output power, high efficiency and low energy consumption. This project present the test methodology used to test and evaluate three different substrates by measuring and evaluating the performance of GaN HEMT devices grown on each type to determine the best substrate material for power amplifier devices. Bachelor of Engineering (Electrical and Electronic Engineering) 2018-12-17T14:28:32Z 2018-12-17T14:28:32Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/76291 en Nanyang Technological University 85 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Electrical and electronic engineering
spellingShingle DRNTU::Engineering::Electrical and electronic engineering
Wirna
Thermal characterisation and analysis of GaN power devices
description The main objective of this final year project is to do thermal analysis of the high-voltage AlGaN/GaN high-electron-mobility transistors (HEMTs) on Silicon (Si), Silicon Carbide (SiC) and CVD-Diamond (Dia) substrate. The measurements in this project were all done on fabricated 0.25 µm gate CPW GaN HEMTs on Si, SiC and Dia substrate. In this work, electrical and pulse measurements of the HEMTs were done and it was observed that GaN-on-Si device has largest current reduction, GaN-on-Dia has the lowest current reduction with GaN-on-SiC in between. After which, junction temperature measurements were carried out. It was found that GaN-on-Si device has the largest delta temperature increase as compared to the other two substrates and GaN-on-Dia has the smallest delta temperature increase. This shows that Silicon device has the largest device self-heating due to the lowest thermal conductivity. Diamond substrate having the highest thermal conductivity, the self-heating of the device is lowest. Finally, the lifetime of both Silicon and Silicon Carbide substrate devices from the degradation rate derived from short term step temperature stress test was evaluated. Instead of using the conventional failure rate to calculate the activation energy, the rates of drain current degradation of Silicon and Silicon Carbide devices were used. With the activation energy plot, the lifetime can be derived from any junction temperature. With the same output power and similar bias conditions, Device fabricated on Silicon Carbide had cooler junction temperature than Silicon. This in turn resulted in slower degradation rate and longer device lifetime. Studies on different types of substrates to achieve the best performance is increasing. Most of the studies are to explore the types of substrate that allow quick dissipation of heat under high power application, to enable high output power, high efficiency and low energy consumption. This project present the test methodology used to test and evaluate three different substrates by measuring and evaluating the performance of GaN HEMT devices grown on each type to determine the best substrate material for power amplifier devices.
author2 Ng Geok Ing
author_facet Ng Geok Ing
Wirna
format Final Year Project
author Wirna
author_sort Wirna
title Thermal characterisation and analysis of GaN power devices
title_short Thermal characterisation and analysis of GaN power devices
title_full Thermal characterisation and analysis of GaN power devices
title_fullStr Thermal characterisation and analysis of GaN power devices
title_full_unstemmed Thermal characterisation and analysis of GaN power devices
title_sort thermal characterisation and analysis of gan power devices
publishDate 2018
url http://hdl.handle.net/10356/76291
_version_ 1772826891868176384