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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.

  1. Fill in the table.

Noun

Verb

Adjective

Adverb

Translation

Transcription

acceptor

accept

acceptor (impurity)

-

принимать, признавать, акцептор, акцепторная примесь

[qk′sept]

attempt

попытка

[q′tempt]

calculate

[′kxlkjuleIt]

conclusion

заключение

condense

continuous

непрерывный

[kqn′tinjuqs]

install

устанавливать

[in′stO:l]

loosely

свободно

majority/ majority charge carriers

большинство/

основные носители заряда

[mq′GOrItI]

minority/minority charge carriers

меньшинство/

неосновные носители заряда

[maI′norItI]

progress

require

требовать

  1. Put the verbs in brackets into the correct form.

  1. What (occur) if holes and electrons (meet) in a semiconductor?

  2. We (get) an N-type semiconductor, if we (add) arsenic to silicon.

  3. If gallium (introduce) into a silicon crystal, it (result) into a P-type semiconductor.

  4. If the electron (have no) pair, it easily (free) itself.

  5. A semiconductor (call) an N-type semiconductor, if the holes (be) the minority charge carriers.

  6. If the thermal agitation (apply) to the silicon crystal, we (have) the holes, moving in the same way as the holes introduced by atoms of gallium.

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