Introduction

  • Peter Y. Yu
  • Manuel Cardona

Abstract

In textbooks on solid-state physics, a semiconductor is usually defined rather loosely as a material with electrical resistivity lying in the range of 10−2 – 109 Ω cm. Alternatively, it can be defined as a material whose energy gap (to be defined more precisely in Chap. 2) for electronic excitations lies between zero and about 3 electron volts (eV). Materials with zero bandgap are metals or semimetals, while those with an energy gap larger than 3 eV are more frequently known as insulators. There are exceptions to these definitions. For example, terms such as semiconducting diamond (whose energy gap is about 6 eV) and semi-insulating GaAs (with a 1.5 eV energy gap) are frequently used. GaN, which is receiving a lot of attention as optoelectronic material in the blue region, has a gap of 3.5 eV

Keywords

Sulfide Mercury Arsenic Boron Selenium 

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Reference

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General Reading

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Peter Y. Yu
    • 1
  • Manuel Cardona
    • 2
  1. 1.Department of PhysicsUniversity of CaliforniaBerkeleyUSA
  2. 2.Max-Planck-Institut für FestkörperforschungStuttgartGermany

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