Electronic Properties and Devices.

Electronic Properties and Devices.

In Chapter 10 on electronic properties we make heavy use of the results from Chapter 9, 

in particular, the electronic energy band structure, and adds to this development the use 

of the statistics for electrons, namely Fermi statistics. An estimate is made about the 

number of electronic states for materials, the so-called density of states (DOS) is calcu- 

lated. From the energy band structure, the density of states (DOS), and the probability 

for occupancy, the Fermi-Dirac distribution function, the electronic arrangement for 

solids is deduced. From this arrangement the electronic nature of the materials is 

revealed, and resulting properties are understood. The different kinds of electronic 

materials are also discussed: conductors, semiconductors, superconductors, and non- 

conductors. Electronic conduction is treated both classically and in terms of quantum 

mechanical ideas. For superconduction the popular BCS theory is introduced. Lastly in 

Chapter 10 the electronic nature of organic materials is introduced, and since many of 

the organic materials in use are amorphous, the electronic nature of amorphous mate- 

rials is discussed.In the final chapter,Chapter 11 on junctions,devices,and the nanoscale, 

we reach a point where we can distill the ideas developed in Chapters 9 and 10 that are 

fundamental to designing and understanding electronic and optical devices.Virtually all 

modern electronic and optical devices use the junctions of materials.Thus in Chapter 11 

we commence with junctions and the electronics implications of joining dissimilar mate- 

rials. From junctions, passive devices that do not change flowing currents or applied 

potentials can be constructed such as thermocouples and solid state refrigerators. Then, 

using various junctions, this chapter introduces electronic devices that are important in 

today's microelectronic technology such as diodes,solar cells,transistors,and the devices 

that comprise computer chips. The basis ideas about optical devices are introduced with 

examples. The last section deals with nanotechnology and the kinds of devices that will 

emerge from ongoing research in fabricating nanoscale structures from materials. 

Ramon A. Carmona C

C.I 17646653

CRF

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