What is pure semiconductors, Computer Engineering

Assignment Help:

Q. What is Pure semiconductors?

Pure semiconductors, known as intrinsic semiconductors, have very few charge carriers and may hence be classified as almost insulators or very poor electrical conductors. However, by adding (through a process known as doping) tiny controlled amounts of impurities (such as boron, gallium, indium, antimony, phosphorus, or arsenic), a semiconductor can be made to contain a desired number of either holes or free electrons and is then known as extrinsic (impure) material. A p-type semiconductor contains primarily holes, whereas an n-type semiconductor contains primarily free electrons. While holes are the majority carriers in a p-type material, it is possible to inject electrons artificially into p-type material, in which case they become excess minority carriers. Minority carriers do play a vital role in certain devices. The doping substance is called an acceptor when the extrinsic semiconductor is the p-type with holes forming the majority carriers and electrons forming the minority carriers. The doping substance is known as the donor when the extrinsic semiconductor is the n-type with free electrons forming the majority carriers and holes forming the minority carriers. Both p- and n-type semiconductors are vitally important in solid-state device technology. Diodes, transistors, and other devices depend on the characteristics of a pn-junction formed when the two materials are joined together as a single crystal.


Related Discussions:- What is pure semiconductors

Function of in network access layer in tcp/ip protocol stack, What is the f...

What is the function of in network access layer in TCP/IP protocol stack? Function of Network Access Layer: The network access layer is the lowest layer within Internet

Program level-parallelism based on granularity size, Program Level : It ...

Program Level : It is the next level consisting of independent programs for parallelism. Coarse Granularity  size is used at this level containing ten thousands of instructions.

Define both fork and vfork, How and when race conditions happen in process ...

How and when race conditions happen in process control? How can it be avoided? b. Differentiate among following functions giving related syntax: (i) fork and vfork (ii) w

State the datatypes of verilog, State the datatypes of Verilog Verilog....

State the datatypes of Verilog Verilog. Compared to VHDL, Verilog data types are very simple, easy to use and very much geared towards modeling hardware structure as opposed to

Self knowledge - characteristics of an experts system, An experts system ...

An experts system has knowledge that lets it reason about its own operations plus a structure that simplifies this reasoning process. For example if an expert system

DATA DICTIONARY, DATA DICTIONARY ON ONLINE QUIZ SYSTEM

DATA DICTIONARY ON ONLINE QUIZ SYSTEM

Show synchronous mode for point-to-point message passing, Q. Show Synchrono...

Q. Show Synchronous mode for point-to-point message passing? Synchronous mode: Transmitting can be started whether or not matching receive has been started, but transmitting w

Explain technical reasons which made microsoft withdraw, Explain technical ...

Explain technical reasons which made Microsoft withdraw its support for VBA in Mac? Ans) The reasons which made Microsoft drop its carry to VBA are as follows, Microsoft visual

Advantages of e-commerce, One of the resources we used was Ajeet Khurana's ...

One of the resources we used was Ajeet Khurana's article that talks about the advantages of e-commerce. It was helpful to gain some background on the variety of benefits the electr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd