Sökning: "buffer-layer"

Visar resultat 1 - 5 av 19 uppsatser innehållade ordet buffer-layer.

  1. 1. Heteroepitaxial Growth of GaN Film on Si substrate by Magnetron Sputtering

    Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Zahra Mohammadianrasnani; [2023]
    Nyckelord :GaN; Sputter epitaxy; Thin film;

    Sammanfattning : In this study, the effect of AlN buffer layer structure and morphology on the GaN films deposited on Si (111) substrate by reactive DC magnetron sputtering have been studied. For structural and morphological characterization X-ray diffraction (XRD) and Scanning electron microscope (SEM) were used. LÄS MER

  3. 2. Development of thick GaN and AlGaN drift layers for vertical power devices

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Andri Dhora; [2023]
    Nyckelord :Technology and Engineering;

    Sammanfattning : High-quality, thick III-nitride epitaxial drift layers with controlled doping are needed for next-generation highly efficient vertical power devices for a smart grid applications and electrification of mobility. Achieving desirable material properties, such as low background impurity concentrations and reduced dislocation densities in combination with high growth rates, necessary for practical application present a challenge. LÄS MER

  4. 3. Flödeseffektivisering av däckbytesprocess : En fallstudie inom produktion

    M1-uppsats, Högskolan i Borås/Akademin för textil, teknik och ekonomi

    Författare :Kristina Avramsson Volcini; Ritta Naiem; [2022]
    Nyckelord :flödeseffektivitet; lean-management; värdeflödeskartläggning; kundvärde; störningar; slöserier och Kaizen;

    Sammanfattning : Denna studie har undersökt och identifierat vilka utmaningar och slöserier som en däckbytesprocess står inför. Förvaltningen som författarna valt att pröva teorier på är Servicekontoret i Borås Stad. Produktionsprocessen i fråga är: Däckbytesprocessen. LÄS MER

  5. 4. Study of HfN as seed layer for next generation of BAW RF filters : synthesis, characterization, and investigation of piezoelectric performance

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Eduard Llorens Balada; [2020]
    Nyckelord :HfN; AlScN; AlN; sputtering; XRD; SEM; seed layer; epitaxial growth;

    Sammanfattning : Micro-electro-mechanical systems (MEMS) have become an essential component of a wide range ofelectronic devices over the last decades such as accelerometers, microphones, gas sensors, and filters.During this new millennium, a new radio frequency (RF) technology has been developed to satisfy thetough demands that arose due to the implementation of 5G wireless communication: bulk acoustic wave(BAW) filters. LÄS MER

  7. 5. A study of the photochromic effect in oxygen containing rare-earth metal hydride thin films and multilayer structures

    Master-uppsats, Uppsala universitet/Tillämpad kärnfysik

    Författare :Sigurbjörn Már Aðalsteinsson; [2020]
    Nyckelord :;

    Sammanfattning : In this work, we have studied the photochromic response of several oxygen containing rare-earth hydride thin films (REHO, RE = Y, Nd, Gd, and Dy). Their chemical composition was characterized by an iterative multi-method approach based on ion beams, while the photochromic effect was measured by means of optical spectrometry. LÄS MER