An analogy for the band theory of metals

Abstract

Presents a useful analogy for teaching students the band theory of metals.

Some chemical and electronic considerations of solid state semiconductor crystals

“…In nonconductors, which can be forced to conduct electric currents at relatively higher voltages, this energy difference between the valence and conduction bands is much greater. A group of substances, known as semiconductors, have band gaps that are intermediate between those of conductors and those of nonconductors (17)(18)(19)(20)(21). As a result, under certain circumstances, these semiconductor substances will behave as nonconductors (when the electrons lack sufficient energy to go from the valence band into the conduction band), and under other conditions the behavior would be more similar to conductors (as the electrons successfully move from the valence band into the conduction band).…”

Luminescent processes elucidated by simple experiments on ZnS

“…1 All correspondence should be directed to this author at SIEMENS AG, FL OHL, D 8000 Munchen 83. 2 In the past, donors were called "coactivators." Acceptors in ZnS were called "activators."…”