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Solid State Electronics > Crystal Properties Of Semiconductors > Flashcards

Crystal Properties Of Semiconductors Flashcards

1
Q

Semiconductor Materials

A

Electrical conductivity intermediate between metals and insulators

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2
Q

Crystal properties of semiconductors

A

Electrical behavior of solids

Arrangement of atoms

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3
Q

What distinguishes semiconductors?

A

Resistance/resistivity

Crystalline structure

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4
Q

Conductivity of semiconductor material can be varied over orders of magnitude by changes in:

A

Temperature

Optical excitation

Impurity content

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5
Q

Elemental semiconductors

A

Si, Ge (IV)

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6
Q

Compound semiconductors

A

GaAs (III-V)

CdTe (II-VI)

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7
Q

Portion of periodic table where semiconductors occur

A

II, III, IV, V, VI

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8
Q

Binary compounds

A

GaAs

GaP

GaN

CdTe

InP

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9
Q

Ternary compounds

A

AlGaAs

GaAsP

HgCdTe

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10
Q

Quaternary compounds

A

InGaAsP

AlGaInAs

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11
Q

Applications of semiconductors

A

Transistors, integrated circuits (Si)

Light emitting diodes (LEDs, GaAs)

Lasers (GaAs)

Light detectors (Si)

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12
Q

Solids classified according to atomic arrangement

A

Crystalline

Amorphous

Polycrystalline

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13
Q

Electric properties in single crystals (mono crystals)

A

Are superior because there are no grain boundaries

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14
Q

The atoms making up the CRYSTAL are arranged…

A

In a periodic fashion called LATTICE

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15
Q

Crystal lattice determines:

A

Density of solid (mechanical property)

Allowed energy bands of electrons (electrical property)

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16
Q

Diamond Lattice

A

An FCC plus placing atoms 1/4a, 1/4a, 1/4a (in x, y, z directions) from each atom in the FCC

Characteristic of Si, Ge

17
Q

Different atomic planes have…

A

Different density of atoms

Different density of available electrons for electric conduction

18
Q

Typical lattices of most commonly used semiconductors

A

Diamond and zincblende lattices

19
Q

Zincblende crystal lattice

A

Characteristic of III-V compounds

20
Q

What is important to the properties of the material?

A

Atomic arrangement in certain planes in crystal

21
Q

Cleaving crystals

A

Along certain atomic planes

Results in exceptionally planar surfaces

22
Q

Etching of a crystal

A

Chemical reactions often take place preferentially along certain directions

Solid State Electronics (9 decks)

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