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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Is aluminum-doped silicon a p-type or an n-type semiconductor? Explain how conductivity occurs in this semiconductor.

Interpretation Introduction

Interpretation:

Aluminum-doped silicon is a p-type or n-type semiconductor has to be identified and the conductivity occurs in this semiconductor has to be explained.

Concept introduction:

P-type semiconductor:

When the trivalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium) is called as p-type semiconductor. Boron (B), Gallium (G), Indium (In), Aluminium (Al) etc. are trivalent impurities and which are called acceptor impurity.

N-type semiconductor:

When pentavalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium) is called as n-type semiconductor. Phosphorus, arsenic, antimony etc are pentavalent impurities which are called donor impurity.

Explanation

Silicon or germanium is used as the intrinsic semiconductor, silicon and germanium has four valence electrons. Silicon with aluminum dopant semiconductor is P-type semiconductor, because, when trivalent impurity is added to silicon is called as p-type semiconductor. Boron (B), Gallium (G), Indium (In), Aluminium (Al) etc is trivalent impurities which are called acceptor impurity...

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