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A semiconductor  is made by doping a germanium crystal with arsenic . A second semiconductor  is made by doping germanium with indium . The two are joined end to end and connected to a battery as shown. Which of the following statements is correct

a)

 is -type,  is -type and the junction is forward biased

b)

 is -type,  is -type and the junction is forward biased

c)

 is -type,  is -type and the junction is reverse biased

d)

 is -type,  is -type and the junction is reverse biased



Question ID - 151006 | SaraNextGen Top Answer

A semiconductor  is made by doping a germanium crystal with arsenic . A second semiconductor  is made by doping germanium with indium . The two are joined end to end and connected to a battery as shown. Which of the following statements is correct

a)

 is -type,  is -type and the junction is forward biased

b)

 is -type,  is -type and the junction is forward biased

c)

 is -type,  is -type and the junction is reverse biased

d)

 is -type,  is -type and the junction is reverse biased

1 Answer
127 votes
Answer Key / Explanation : (d) -

(d)

Arsenic has five valence electrons, so it a donor impurity. Hence  becomes -type semiconductor. Indium has only three outer electrons, so it is an acceptor impurity. Hence  becomes -type semiconductor. Also  is connected to positive terminal of battery and  is connected to negative terminal of battery so -junction is reverse biased

127 votes


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