[SI-LIST] Re: Doping effects.
- From: "GEORGE VARGHESE" <rfengg@xxxxxxxxx>
- To: rfengg@xxxxxxxxx, lkteh@xxxxxxxxxxxxxx
- Date: Fri, 21 Mar 2003 22:52:07 +1100
Hi Leh,
Thanks for that great answer.
Regards,
george
--
On Fri, 21 Mar 2003 13:06:53
Teh Lip Khoon wrote:
>Hi George,
>
>Conductivity is given by quN where q is the electronic charge, u is the
>mobility of carrier and N is effective carrier concentration. Increasing the
>doping concentration will increase N, as well as dopant ion concentration. At
>low to medium dose, that's fine. An increase in conductivity is achieved.
>However, if the doping concentration is high, you start having a lot of dopant
>ions sitting in the crystal lattice of Si. This can cause strain in the
>Si lattice. Also, the dopant ions in high concentration causes carrier
>scattering due to interaction of the charged carrier with the dopant ion.
>When you have such a situation, the carrier mobility suffers. Therefore the
>conductivity of your silicon is not going to increase much. The name for
>heavily-doped silicon is "degenerate", and they are seldom used in typical
>semiconductor application.
>
>Regards,
>LK
>
>
>GEORGE VARGHESE wrote:
>
>> Hi all,
>> If doping increases the conductivity of Silicon , why cant we
>> attain superconductivity with heavy doping of a material? Whats the
>> phenomenon that limits the conductivity if we actually do increase carriers
>> by doping?
>>
>> Thanks and regards,
>> George.
>>
>> _____________________________________________________________
>> Get 25MB, POP3, Spam Filtering with LYCOS MAIL PLUS for $19.95/year.
>> http://login.mail.lycos.com/brandPage.shtml?pageId=plus&ref=lmtplus
>> ------------------------------------------------------------------
>> To unsubscribe from si-list:
>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>>
>> or to administer your membership from a web page, go to:
>> //www.freelists.org/webpage/si-list
>>
>> For help:
>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>>
>> List archives are viewable at:
>> //www.freelists.org/archives/si-list
>> or at our remote archives:
>> http://groups.yahoo.com/group/si-list/messages
>> Old (prior to June 6, 2001) list archives are viewable at:
>> http://www.qsl.net/wb6tpu
>>
>
>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>//www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>List archives are viewable at:
> //www.freelists.org/archives/si-list
>or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
>Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
_____________________________________________________________
Get 25MB, POP3, Spam Filtering with LYCOS MAIL PLUS for $19.95/year.
http://login.mail.lycos.com/brandPage.shtml?pageId=plus&ref=lmtplus
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
