Geri Dön

Multiscale electro-thermal modeling of AlGaN/GaN heterostructure field effect transistors

Başlık çevirisi mevcut değil.

PDF İndir

  1. Tez No: 401058
  2. Yazar: FATMA NAZLI DÖNMEZER
  3. Danışmanlar: PROF. SAMUEL GRAHAM
  4. Tez Türü: Doktora
  5. Konular: Makine Mühendisliği, Mechanical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2013
  8. Dil: İngilizce
  9. Üniversite: Georgıa Instıtute Of Technology
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: Belirtilmemiş.

Özet

Özet yok.

Özet (Çeviri)

There has been growing interest in AlGaN/GaN Heterojunction Field E ect Transistors (HFETs) that can operate in high power and high frequency applications. However, due to its large phononic band gap and the Fr ohlich interaction of electrons with high energy polar optical phonons, intense heating and a phonon bottleneck occurs that impacts the ability to dissipate heat locally near the transistor's gate. Thus, an intense hotspot occurs which can impact the overall device reliability. While numerous studies have modeled AlGaN/GaN transistors to estimate the hotspot temperature, little attention has been given to the phonon transport physics which occurs in the devices. In general, these models fail to capture ballistic-di usive phonon conduction which can result in an elevated temperature rise that is not predicted by other models used to analyze AlGaN/GaN HEMTs. Such models will provide greater insight into the thermal transport process and thermal response of the self heating of these technologically important devices. To build a thermal model that will capture these ballistic e ects, rst the methods that can be used for phonon transport modeling were presented. Later, the appropriate method was picked by comparing the performance of two common methods using a gray approximation in ballistic to di usive regimes. After the method was chosen for the ballistic-di usive thermal simulations, a multiscale model was suggested. This multiscale model allows modeling geometries other than the die while still including the ballistic e ects at the hotspot with reasonable computational cost. In the meantime, a non-gray approach that included the e ects of the di erent relaxation times and the thermal conductivities of phonon modes in the crystal was introduced. Later, using this multiscale electro-thermal model, device simulations at di erent biasing conditions were performed on two- nger HFETs grown on SiC substrates and mounted on RF packages. To obtain the Joule heating distribution that might have an impact on device temperature, electrical simulations were performed using hydrodynamic and Monte Carlo simulations. After the electrical Joule heating distribution was obtained, it was used in gray and non-gray multiscale thermal simulations and the temperature distribution within the device and the hotspot was obtained. With this thesis, an electro-thermal approach to investigate the ballistic-di usive nature of the heating in AlGaN/GaN HFETs is presented as well as the impact of electrical bias conditions on the heat generation distribution. This e ort is the rst to employ such a scheme for the analysis of AlGaN/GaN devices for temperature modeling. Finally, this method allowed us to capture the deviation from purely di usive transport. In general, this deviation lasted over 5 to 10 m around the device and the temperature deviation ranged from 5K to 50K at the maximum point depending on the mean free path of phonons, power density, and the biasing condition.

Benzer Tezler

  1. Tez No

    917694

    Pulsar magnetospheres and intra - pulse variability by plasmoid formation

    Atarca manyetosferleri ve plazmoid oluşumu kaynaklı atım - arası değişkenliği

    İBRAHİM CEYHUN ANDAÇ

    Doktora

    İngilizce

    İngilizce

    2024

    Fizik ve Fizik Mühendisliğiİstanbul Teknik Üniversitesi

    Fizik Mühendisliği Ana Bilim Dalı

    PROF. DR. KAZIM YAVUZ EKŞİ

  2. Tez No

    736231

    Micro-scanning mirrors and lenses for improving image resolution

    Görüntü çözünürlüğünün arttırılması amacıyla mikro tarama ayna ve lens geliştirilmesi

    AHMET SÖZAK

    Doktora

    İngilizce

    İngilizce

    2022

    Mekatronik MühendisliğiOrta Doğu Teknik Üniversitesi

    Mikro ve Nanoteknoloji Ana Bilim Dalı (disiplinlerarası)

    DOÇ. DR. KIVANÇ AZGIN

  3. Tez No

    988369

    Innovative brazing of Ti-6Al-4V and inconel 718 using cobalt coated BNi-2 powders

    Kobalt kaplanmış BNi-2 kullanarak Ti-6Al-4V ve inconel 718 için yenilikçi sert lehimleme

    TANSU GÖYNÜK

    Doktora

    İngilizce

    İngilizce

    2025

    Metalurji MühendisliğiOrta Doğu Teknik Üniversitesi

    Metalurji ve Malzeme Mühendisliği Ana Bilim Dalı

    PROF. DR. İSHAK KARAKAYA

    PROF. DR. ZİYA ESEN

  4. Tez No

    991149

    Multi Scale Multi Domain Approach for Modeling of the PEM fuel cell and Li-Ion Batteries

    Pem yakıt pili ve li-iyon bataryaların modellenmesinde çok ölçekli ve çok alanlı yaklaşım

    ONGUN BORA SABAN

    Doktora

    İngilizce

    İngilizce

    2026

    Makine MühendisliğiGebze Teknik Üniversitesi

    Makine Mühendisliği Ana Bilim Dalı

    PROF. DR. MEHMET ALİ ARSLAN

    DOÇ. DR. MUSTAFA FAZIL SERİNCAN

  5. Tez No

    397249

    Utilizing multi-scale modeling and experimentation to uncover the role of micro-deformation mechanisms on the performance of high-strength steels

    Mikro deformasyon mekanizmalarının yüksek mukavemetli çeliklerin performansına etkilerinin çok ölçekli modelleme ve deneysel yöntemlerle belirlenmesi

    BURAK BAL

    Doktora

    İngilizce

    İngilizce

    2015

    Makine MühendisliğiKoç Üniversitesi

    Makine Mühendisliği Ana Bilim Dalı

    DOÇ. DR. DEMİRCAN CANADİNÇ

Geri Dön