Semiconductor physics and light-matter interaction

PHYS-433

Recorded version of Lecture 2

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PHYS-433 Lecture2

29.09.2021, 14:37

In Lecture 2, we revisit the notion of bandgap, which is a landmark signature of semiconductors. To this end, we provide a quick reminder regarding the notion of crystal and reciprocal lattice. We then make use of the nearly-free electron model to show that the presence of a bandgap is due to the interaction taking place between neighboring atoms that form a crystal. This necessitates the derivation of the so-called secular equation obtained within the framework of Bloch wave theory of crystals. We also go through the notion of dispersion curve that is quintessential to describe the band structure of any crystalline solids with a specific focus on the band structure of semiconductors. Early insights about the important notion of effective mass for free carriers are given at the end of this lecture.

PHYS-433 Lecture2

29.09.2021, 14:37

In Lecture 2, we revisit the notion of bandgap, which is a landmark signature of semiconductors. To this end, we provide a quick reminder regarding the notion of crystal and reciprocal lattice. We then make use of the nearly-free electron model to show that the presence of a bandgap is due to the interaction taking place between neighboring atoms that form a crystal. This necessitates the derivation of the so-called secular equation obtained within the framework of Bloch wave theory of crystals. We also go through the notion of dispersion curve that is quintessential to describe the band structure of any crystalline solids with a specific focus on the band structure of semiconductors. Early insights about the important notion of effective mass for free carriers are given at the end of this lecture.

PHYS-433 Lecture2

29.09.2021, 14:37

In Lecture 2, we revisit the notion of bandgap, which is a landmark signature of semiconductors. To this end, we provide a quick reminder regarding the notion of crystal and reciprocal lattice. We then make use of the nearly-free electron model to show that the presence of a bandgap is due to the interaction taking place between neighboring atoms that form a crystal. This necessitates the derivation of the so-called secular equation obtained within the framework of Bloch wave theory of crystals. We also go through the notion of dispersion curve that is quintessential to describe the band structure of any crystalline solids with a specific focus on the band structure of semiconductors. Early insights about the important notion of effective mass for free carriers are given at the end of this lecture.

PHYS-433 Lecture2

29.09.2021, 14:37

In Lecture 2, we revisit the notion of bandgap, which is a landmark signature of semiconductors. To this end, we provide a quick reminder regarding the notion of crystal and reciprocal lattice. We then make use of the nearly-free electron model to show that the presence of a bandgap is due to the interaction taking place between neighboring atoms that form a crystal. This necessitates the derivation of the so-called secular equation obtained within the framework of Bloch wave theory of crystals. We also go through the notion of dispersion curve that is quintessential to describe the band structure of any crystalline solids with a specific focus on the band structure of semiconductors. Early insights about the important notion of effective mass for free carriers are given at the end of this lecture.

PHYS-433 Lecture2

29.09.2021, 14:37

In Lecture 2, we revisit the notion of bandgap, which is a landmark signature of semiconductors. To this end, we provide a quick reminder regarding the notion of crystal and reciprocal lattice. We then make use of the nearly-free electron model to show that the presence of a bandgap is due to the interaction taking place between neighboring atoms that form a crystal. This necessitates the derivation of the so-called secular equation obtained within the framework of Bloch wave theory of crystals. We also go through the notion of dispersion curve that is quintessential to describe the band structure of any crystalline solids with a specific focus on the band structure of semiconductors. Early insights about the important notion of effective mass for free carriers are given at the end of this lecture.

PHYS-433 Lecture2

29.09.2021, 14:37

In Lecture 2, we revisit the notion of bandgap, which is a landmark signature of semiconductors. To this end, we provide a quick reminder regarding the notion of crystal and reciprocal lattice. We then make use of the nearly-free electron model to show that the presence of a bandgap is due to the interaction taking place between neighboring atoms that form a crystal. This necessitates the derivation of the so-called secular equation obtained within the framework of Bloch wave theory of crystals. We also go through the notion of dispersion curve that is quintessential to describe the band structure of any crystalline solids with a specific focus on the band structure of semiconductors. Early insights about the important notion of effective mass for free carriers are given at the end of this lecture.