Question

In: Physics

Are the following statements about photodiodes correct in whether they’re true or false? I’ve already done...

Are the following statements about photodiodes correct in whether they’re true or false? I’ve already done the assignment and I got 50% on this question and would like to know where I’ve gone wrong and where is right

-Hole-electron pairs in an avalache photodiode can recombine if former in the bulk material - true

- The avalanche photodiode uses a photocathode with a low work function - false

- The diode achieves high sensitivity by electrons tunnelling through the depletion region - false

- The depletion region in an avalanche photodiode is deliberately made large - true

- electrons in the avalanche photodiode are accelerated by a high field - true

- The avalanche photodiode uses impact ionisation- true

- The speed of avalanche multiplication prevents an avalanche photodiode from responding quickly - true

Expert Solution

(a)Hole-electron pairs in an avalanche photodiode can recombine if former is the bulk material- False

Reason: The electron hole pair recombines in a avalanche photodiode because of quantization of charge on electrons and holes. This is called shot noise

(b) The avalanche photodiode uses a photocathode with a low work function - False

(c) The diode achieves high sensitivity by electrons tunnelling through the depletion region - False

Reason: The avalanche photodiode achieves high sensitivity due to avalanche multiplication of charge carriers due to avalanche effect. The regular p-i-n diode achieves high sensitivity as the EHP created in depletion region and charge carriers are drifted to its places by high electric field.

(d)The depletion region in an avalanche photodiode is deliberately made large - true

(e) electrons in the avalanche photodiode are accelerated by a high field - true

(f)- The avalanche photodiode uses impact ionisation- true

(g)- The speed of avalanche multiplication prevents an avalanche photodiode from responding quickly - False

The responsiveness or the sensitivity of a avalanche photo diode is reduced by thermal regeneration/combination of EHP(shot noise) or due to random thermal motion of the carriers(johnson noise)

genius_generous answered 2 years ago

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