Physics of Semiconductor Devices

Сентябрь 15, 2022

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Physics of Semiconductor Devices

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2. Literature Степаненко И.П. Основы микроэлектроники: Учеб. пособие для вузов. – 2-е изд., перераб. и доп.. –
3. Contents: The origin of energy bands in solids. Band diagrams. Metals, semiconductors and insulators in the
4. The origin of energy bands in solids When two single or isolated atoms are bring close
5. The origin of energy bands in solids The electrons in same orbit exhibits different energy levels.
6. The origin of energy bands in solids The electrons in same orbit exhibits different energy levels.
7. The origin of energy bands in solids
8. Band diagrams
9. Band diagrams
10. The dependence of the semiconductor bandgap on the temperature
11. The dependence of the semiconductor bandgap on the temperature “simplified” form:
12. The concept of electrons and holes in semiconductors
13. The concept of electrons and holes in semiconductors
14. The concept of electrons and holes in semiconductors Let’s take an example, as shown in fig
15. The concept of electrons and holes in semiconductors The total current in semiconductor is the sum
16. Metals, semiconductors and insulators in the band theory
17. Metals, semiconductors and insulators in the band theory
18. Metals, semiconductors and insulators in the band theory
19. Metals, semiconductors and insulators in the band theory
20. Effective mass Semiclassical Equations of Motion:
21. Effective mass
22. Effective mass
24. Скачать презентацию

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Literature
Степаненко И.П. Основы микроэлектроники: Учеб. пособие для вузов. – 2-е изд.,

перераб. и доп.. – М. : Лаборатория Базовых Знаний, 2001. – 488 с. : ил.
*Агаханян, Т.М. Основы транзисторной электроники [Текст] / Т. М. Агаханян. - М. : Энергия, 1974. - 256 с
Sah C.‑T. Fundamentals of solid-state electronics /C.‑T. Sah. World Scientific, 1991. 1011 p.
https://ocw.mit.edu/courses/find-by-topic/#cat=engineering&subcat=electricalengineering&spec=electronics

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Contents:
The origin of energy bands in solids. Band diagrams.
Metals, semiconductors and

insulators in the band theory.
The dependence of the semiconductor bandgap on the temperature.
The concept of electrons and holes in semiconductors. Effective mass.

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The origin of energy bands in solids
When two single or isolated

atoms are bring close to each other then the outermost orbit electrons of two atoms are interact or shared with each other. i.e, the electrons in the outermost orbit of one atom experience a attractive force from the nearest or neighboring atomic nucleus. Due to this the energies of the electrons will not be in same level, the energy levels of electrons are changed to a value which is higher or lower than that of the original energy level of the electron.

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The origin of energy bands in solids
The electrons in same orbit

exhibits different energy levels. The grouping of this different energy levels is called energy band.

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The origin of energy bands in solids
The electrons in same orbit

exhibits different energy levels. The grouping of this different energy levels is called energy band.

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The origin of energy bands in solids

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Band diagrams

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Band diagrams

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The dependence of the semiconductor bandgap on the temperature

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The dependence of the semiconductor bandgap on the temperature
“simplified” form:

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The concept of electrons and holes in semiconductors

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The concept of electrons and holes in semiconductors

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The concept of electrons and holes in semiconductors
Let’s take an example,

as shown in fig there are three atoms atom A, atom B and atom C. At room temperature valence electron in an atom A gains enough energy and jumps in to conduction band as show in fig (1). When it jumps in to conduction band a hole (vacancy) is created in the valence band at atom A as shown in fig (2). Then the neighboring electron from atom B moves to atom A to fill the hole at atom A. This creates a hole at atom B as shown in fig (3). Similarly neighboring electron from atom C moves to atom B to fill the hole at atom B. This creates a hole at atom C as shown in fig (4). Likewise electrons moves from left side to right side and holes moves from right

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