create account

Semiconductors: Basic Concepts for Optical Properties >şţęęɱȋț< by jonathanxvi

View this thread on: hive.blogpeakd.comecency.com
· @jonathanxvi ·
$5.06
Semiconductors: Basic Concepts for Optical Properties >şţęęɱȋț<
<html>
<p><img src="https://s2.postimg.org/e8sv8nzhl/image.jpg" width="960" height="695"/></p>
<p>Image source: <a href="http://www.uv.es/otri/imagenes/FOSE-1.jpg">google</a></p>
<p><br></p>
<p>Hello friends of steemit one way to study semiconductors is through optical properties but before we have to know some basic concepts.</p>
<p><br></p>
<p><strong>What are photons?</strong></p>
<p>A photon is an elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual photons).</p>
<p>More details here the link: <a href="https://en.wikipedia.org/wiki/Photon">photons</a></p>
<p><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Sem_X_photon.svg/788px-Sem_X_photon.svg.png" width="788" height="1024"/></p>
<p>Image source: <a href="https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Sem_X_photon.svg/788px-Sem_X_photon.svg.png">google</a></p>
<p><br></p>
<p><strong>What is a phonon?</strong></p>
<p>In physics, a phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter, like solids and some liquids. Often designated a quasiparticle</p>
<p>More details here the link: <a href="https://en.wikipedia.org/wiki/Phonon">phonon</a></p>
<p><img src="http://hst-archive.web.cern.ch/archiv/HST2001/accelerators/superconductivity/phonon2.jpg" width="1164" height="608"/></p>
<p>Image source: <a href="http://hst-archive.web.cern.ch/archiv/HST2001/accelerators/superconductivity/phonon2.jpg">google</a></p>
<p><br></p>
<p><strong>Valence band and conduction band</strong></p>
<p>In solid-state physics, the valence band and conduction band are the closest to the Fermi level and thus determine the electrical conductivity of the solid.</p>
<p><strong>Valence band</strong></p>
<p>In solids theory, the band of valence is called the highest of the ranges of electron energies (or bands) that is occupied by electrons in absolute zero.</p>
<p>&nbsp;<strong>conduction band</strong> &nbsp;</p>
<p>Is the range of electronic energies that, being above the valence band, allows the electrons to undergo accelerations by the presence of an external electric field and, therefore, allows the presence of electric currents.</p>
<p><img src="http://www.thephysicsmill.com/blog/wp-content/uploads/valence_and_conduction_bands.png"/><strong>Band prohibited</strong></p>
<p>The forbidden band of a semiconductor is the minimum energy required to excite an electron from its connected state to a free state that allows it to participate in conduction.</p>
<p><img src="http://www.thephysicsmill.com/blog/wpcontent/uploads/valence_and_conduction_bands.png"/>More details here the link: <a href="https://en.wikipedia.org/wiki/Valence_and_conduction_bands">[1]</a> <a href="https://en.wikipedia.org/wiki/Valence_and_conduction_bands">[2]&nbsp;</a></p>
<p><br></p>
<p><strong>Direct transitions and indirect transitions</strong></p>
<p>There are two types of transitions, in which only the photon yields energy and those in which the crystal lattice transfers energy and therefore one or more phonons are emitted or absorbed simultaneously with the absorption of the photon.</p>
<p><strong>Direct transitions:</strong> these take place when the wave vector of the maximum of the valence band and the minimum of the conduction band coincide and consequently the moment is conserved.</p>
<p><br></p>
<p><strong>Indirect transitions:</strong> occurs when the ǩ wave vectors of the maximum of the band of the valence band and the minimum of the conduction band do not coincide, so a change of both energy and momentum is required.</p>
<p>Since the photon alone can not cause the change of momentum, the momentum is conserved by the process of absorption or emission of a phonon.</p>
<p>More details here the link: <a href="https://en.wikipedia.org/wiki/Direct_and_indirect_band_gaps">[3]</a></p>
<p><br></p>
<p><br></p>
<p><br></p>
<p><img src="https://s4.postimg.org/h9sxo6s5p/voto.gif" width="1277" height="240"/></p>
</html>
👍  , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , and 177 others
properties (23)
authorjonathanxvi
permlinksemiconductors-basic-concepts-for-optical-properties-stee-t
categoryscience
json_metadata{"tags":["science","education","newslink","news","blog"],"image":["https://s2.postimg.org/e8sv8nzhl/image.jpg","https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Sem_X_photon.svg/788px-Sem_X_photon.svg.png","http://hst-archive.web.cern.ch/archiv/HST2001/accelerators/superconductivity/phonon2.jpg","http://www.thephysicsmill.com/blog/wp-content/uploads/valence_and_conduction_bands.png","http://www.thephysicsmill.com/blog/wpcontent/uploads/valence_and_conduction_bands.png","https://s4.postimg.org/h9sxo6s5p/voto.gif"],"links":["http://www.uv.es/otri/imagenes/FOSE-1.jpg","https://en.wikipedia.org/wiki/Photon","https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Sem_X_photon.svg/788px-Sem_X_photon.svg.png","https://en.wikipedia.org/wiki/Phonon","http://hst-archive.web.cern.ch/archiv/HST2001/accelerators/superconductivity/phonon2.jpg","https://en.wikipedia.org/wiki/Valence_and_conduction_bands","https://en.wikipedia.org/wiki/Direct_and_indirect_band_gaps"],"app":"steemit/0.1","format":"html"}
created2017-03-17 00:09:33
last_update2017-03-17 00:09:33
depth0
children3
last_payout2017-04-17 09:59:00
cashout_time1969-12-31 23:59:59
total_payout_value3.919 HBD
curator_payout_value1.138 HBD
pending_payout_value0.000 HBD
promoted0.000 HBD
body_length4,108
author_reputation13,348,251,038,174
root_title"Semiconductors: Basic Concepts for Optical Properties >şţęęɱȋț<"
beneficiaries[]
max_accepted_payout1,000,000.000 HBD
percent_hbd10,000
post_id2,741,941
net_rshares6,893,684,792,117
author_curate_reward""
vote details (241)
@diracdnb ·
Nice post! :) I like to think of phonons as lattice vibrations.

I think Bloch's Theorem is a really neat result. It's potentially my favourite theorem in condensed matter physics. The quick take-away from it is that electron transport through the lattice comes with no associated energy cost. Fun to imagine creation/annihilation of electrons at various lattice sites.
properties (22)
authordiracdnb
permlinkre-jonathanxvi-semiconductors-basic-concepts-for-optical-properties-stee-t-20170317t013119617z
categoryscience
json_metadata{"tags":["science"],"app":"steemit/0.1"}
created2017-03-17 01:31:21
last_update2017-03-17 01:31:21
depth1
children0
last_payout2017-04-17 09:59:00
cashout_time1969-12-31 23:59:59
total_payout_value0.000 HBD
curator_payout_value0.000 HBD
pending_payout_value0.000 HBD
promoted0.000 HBD
body_length369
author_reputation2,766,623,671,632
root_title"Semiconductors: Basic Concepts for Optical Properties >şţęęɱȋț<"
beneficiaries[]
max_accepted_payout1,000,000.000 HBD
percent_hbd10,000
post_id2,742,553
net_rshares0
@inity ·
Great post! Refreshing some knowledge :)
properties (22)
authorinity
permlinkre-jonathanxvi-semiconductors-basic-concepts-for-optical-properties-stee-t-20170317t150806004z
categoryscience
json_metadata{"tags":["science"],"app":"steemit/0.1"}
created2017-03-17 15:08:06
last_update2017-03-17 15:08:06
depth1
children0
last_payout2017-04-17 09:59:00
cashout_time1969-12-31 23:59:59
total_payout_value0.000 HBD
curator_payout_value0.000 HBD
pending_payout_value0.000 HBD
promoted0.000 HBD
body_length40
author_reputation2,585,280,263,359
root_title"Semiconductors: Basic Concepts for Optical Properties >şţęęɱȋț<"
beneficiaries[]
max_accepted_payout1,000,000.000 HBD
percent_hbd10,000
post_id2,747,138
net_rshares0
@steemtrail ·
$1.16
Hello @jonathanxvi, 

Congratulations! Your post has been chosen by the communities of SteemTrail as one of our top picks today.

Also, as a selection for being a top pick today, you have been [awarded a TRAIL token for your participation](https://discord.gg/w4sdqkS) on our innovative platform...STEEM.
[Please visit SteemTrail](https://discord.gg/w4sdqkS) to get instructions on how to claim your TRAIL token today.

If you wish to not receive comments from SteemTrail, please reply with "Stop" to opt out.
 

Happy TRAIL!
http://i.imgur.com/vs9Ai7I.png
👍  , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , and 85 others
properties (23)
authorsteemtrail
permlinkre-jonathanxvi-semiconductors-basic-concepts-for-optical-properties-stee-t-20170317t135830475z
categoryscience
json_metadata{"tags":["science"],"users":["jonathanxvi"],"image":["http://i.imgur.com/vs9Ai7I.png"],"links":["https://discord.gg/w4sdqkS"],"app":"steemit/0.1"}
created2017-03-17 13:58:42
last_update2017-03-17 13:58:42
depth1
children0
last_payout2017-04-17 09:59:00
cashout_time1969-12-31 23:59:59
total_payout_value1.064 HBD
curator_payout_value0.100 HBD
pending_payout_value0.000 HBD
promoted0.000 HBD
body_length555
author_reputation263,209,530,304,931
root_title"Semiconductors: Basic Concepts for Optical Properties >şţęęɱȋț<"
beneficiaries[]
max_accepted_payout1,000,000.000 HBD
percent_hbd10,000
post_id2,746,561
net_rshares2,614,263,271,198
author_curate_reward""
vote details (149)