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Callister - An introduction - 8th edition

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18.10 Intrinsic Semiconduction • 735<br />

Si Si Si Si<br />

Si Si Si Si<br />

Figure 18.11 Electron bonding model of<br />

electrical conduction in intrinsic silicon:<br />

(a) before excitation, (b) and (c) after<br />

excitation (the subsequent free-electron and<br />

hole motions in response to an external<br />

electric field).<br />

Si Si Si Si<br />

(a)<br />

Field<br />

Si Si Si Si<br />

Hole<br />

Free electron<br />

Si<br />

Si<br />

Si<br />

Si<br />

Si Si Si Si<br />

(b)<br />

Field<br />

Si Si Si Si<br />

Free electron<br />

Si Si Si<br />

Hole<br />

Si<br />

Si Si Si Si<br />

(c)

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