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Unit I

SEMICONDUCTORS OF N-TYPE AND P-TYPE

Language Work (I) If/when-clause (If/when I install …, it will result in … )

If/

when

+

Present Simple

+

Future Simple

I/we/you/they

add/form/leave

I/we/you/they

he/she/it

will

except/attempt/

require

he/she/it

adds/forms/leaves

or

Future Simple

+

if/

when

+

Present Simple

I/we/you/they

he/she/it

will

except/attempt/

require

I/we/you/they

add/form/leave

he/she/it

adds/forms/leaves

For example:

If/when we add a small amount of arsenic to silicon, several valence electrons of each arsenic atom will form covalent bonds with the neighbouring atoms of silicon.

If/when gallium is introduced into a silicon crystal, each gallium atom will attempt to form a covalent bond with each of its four neighbouring silicon atoms.