Tech Briefs Magazine - August 2021 - 21

High-Mobility Transport Layer Structures for
Rhombohedral Si/Ge/SiGe Devices
This invention enables improved carrier mobility for solar cells and other electronic devices.
Langley Research Center, Hampton, Virginia
erformance of solar cells and other
electronic devices, such as transistors,
can be improved greatly if carrier
mobility is increased. Si and Ge have
Type-II bandgap alignment in cubically
strained and relaxed layers. Quantum
well and superlattice with Si, Ge, and
SiGe have been good noble structures to
build high electron mobility layer and
high hole mobility layers.
However, the atomic lattice constant of
Ge is bigger than that of Si and direct
epitaxial growth generates a large density
of misfit dislocations that decrease carrier
mobility and shorten device lifetime.
So, it required special buffer layers, such
as superlattice or gradient indexed layers,
to grow Ge on Si wafers or Si on Ge
wafers. The growth of these buffer layers
takes extra effort, such as a post-annealing
process, to remove dislocations by dis -
location gliding inside the buffer layer.
P
vvvvv
   
AUXILIARY POWER
APU (Auxiliary Power Unit)
SGCU (Starter/Generator Control Unit)
CABIN SYSTEMS
In-Flight Entertainment
Wi-Fi
Video On-Demand on Seats
Galley Equipment
Lighting Systems
FLIGHT DECK
Control & Display System
Communication Navigation and Identification
Black Box
Traffic Collision Avoidance System
The structures enable improved carrier mobility for solar cells.
ENGINE SYSTEMS
ECU (Engine Control Unit)
Fuel Management System
AVIONICS
IMA (Integrated Modular Avionics)
AFDX E/S (Aircraft Full Duplex End-System)
NAVIGATION and FLIGHT CONTROL
FCU (Flight Control Unit)
GPS
Inertial Guidance System
    
    
      

Tech Briefs, August 2021
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Tech Briefs Magazine - August 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - August 2021

Tech Briefs Magazine - August 2021 - Intro
Tech Briefs Magazine - August 2021 - Sponsor
Tech Briefs Magazine - August 2021 - Cov1
Tech Briefs Magazine - August 2021 - Cov2
Tech Briefs Magazine - August 2021 - 1
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Tech Briefs Magazine - August 2021 - 3
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Tech Briefs Magazine - August 2021 - Cov3
Tech Briefs Magazine - August 2021 - Cov4
Tech Briefs Magazine - August 2021 - MD-Cov1
Tech Briefs Magazine - August 2021 - MD-Cov2
Tech Briefs Magazine - August 2021 - MD-1
Tech Briefs Magazine - August 2021 - MD-2
Tech Briefs Magazine - August 2021 - MD-3
Tech Briefs Magazine - August 2021 - MD-4
Tech Briefs Magazine - August 2021 - MD-5
Tech Briefs Magazine - August 2021 - MD-6
Tech Briefs Magazine - August 2021 - MD-7
Tech Briefs Magazine - August 2021 - MD-8
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Tech Briefs Magazine - August 2021 - MD-10
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Tech Briefs Magazine - August 2021 - MD-13
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Tech Briefs Magazine - August 2021 - MD-32
Tech Briefs Magazine - August 2021 - MD-33
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Tech Briefs Magazine - August 2021 - MD-36
Tech Briefs Magazine - August 2021 - MD-37
Tech Briefs Magazine - August 2021 - MD-38
Tech Briefs Magazine - August 2021 - MD-39
Tech Briefs Magazine - August 2021 - MD-40
Tech Briefs Magazine - August 2021 - MD-Cov3
Tech Briefs Magazine - August 2021 - MD-Cov4
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