Interpretation: The only elemental semiconductors (
Concept Introduction:
Band theory helps to study about conductors, semiconductors and insulators. The electrons of an atom will be in permitted energy levels. These energy levels form bands. Three types of bands are available namely,
- Filled band- (found near nucleus, bears no free electrons)
- Valence band- (last band bearing valence electrons, these are free electrons)
- Conduction band – (accepts free electrons escaping from valence band)
These bands help to explain conductivity of elements. All the bands will lie in different energy levels. When a free electron from valence band escapes into conduction band, conductivity takes place. The energy gap between valence band and conduction band decides the conductivity of an element.
Semiconductors are substances that conduct electricity either by addition of an impurity or by the effects of temperature on it. Semiconductors electrically conductivity lies between conductor and insulator. Semiconductors have small energy gap between valence band and conduction band.
Want to see the full answer?
Check out a sample textbook solutionChapter 24 Solutions
Chemistry: Atoms First
- 8.96 A business manager wants to provide a wider range of p- and n-type semiconductors as a strategy to enhance sales. You are the lead materials engineer assigned to communicate with this manager. How would you explain why there are more ways to build a p-type semiconductor from silicon than there are ways to build an n-type semiconductor from silicon?arrow_forward8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap in the material. Generally, in order to have a larger band gap, the dopant should be smaller than the main material. If you are a materials engineer and need a semiconductor that has lower conductivity thin pure silicon, what clement or elements could you use as your dopant? (You do not want either an n- or a p- type material) Explain your reasoning.arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningPhysical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,
- Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningPrinciples of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning