NNSE618-L22-band_engineering

NNSE618-L22-band_engineering - 1 Lecture contents Alloying...

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NNSE 618 Lecture #22 1 Lecture contents Alloying Vegard law Bandgaps and lattice Quantum confinement Stress and strain Deformation potential Heteroepitaxy and strain
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NNSE 618 Lecture #22 2 Bandstructure modification Alloying Quantum confinement Built-in strain
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NNSE 618 Lecture #22 3 Bandgap and lattice constants Very close lattice matching
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NNSE 618 Lecture #22 4 Bandgap and lattice constants for hexagonal group III- nitrides
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NNSE 618 Lecture #22 5 Alloys Vegard’s law for lattice constant of alloy Works for Random alloys With constant crystal structure Average periodic potential of a “virtual crystal” Band extrema follow almost linear dependence with slight bowing due to alloy disorder Effective mass for a given extremum B A alloy a x xa a ) 1 ( x x B A 1 From Singh, 2003 2 cx bx a E alloy g * * * 1 1 B A alloy m x m x m B A alloy V x xV V ) 1 (
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Lecture #22 6 Bandgap in AlGaAs Bandgap of AlGaAs
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NNSE618-L22-band_engineering - 1 Lecture contents Alloying...

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