Ga-As wafer:
Galliumarsenide (GaAs) is a compound of Gallium (Ga, 31) and Arsenic (As, 33)-a compound semiconductor generated by reaction of Gr. III-V elements, a direct band gap produces the semiconductor item putting its signature in semiconductor industry. The compound is used extensively for microwave and IR frequency integrated circuits devices. GaAs is actually GaAs3 because Ga is in +3 oxidation state.
Single crystal GaAs can be prepared by well-known industrial crystallization method and is not the topic chosen to discuss here. Rather, methods for producing Thinfilm GaAs will be highlighted here. Other elements from gr. III-V is likely to follow MOCVD or MB epitaial growth to form films of InGaAs or AlGaAs etc. These are:
1. VPE (Vapor Phase epitaxy) 2Ga + 2AsCl3→ 2GaAs + 3Cl2
2. MOCVD, GA (CH3)3+ AsH3→GaAs +3CH4
3. MBE, 4Ga + As4 → 4GaAs
#.Ga-As film:
Bell Lab carried on growing thin film reaction under the name VBE (vacuum chemical epitaxy). First Ga-As film was made by using TMGa with Arsine gas.
TrimethylGa (TMGa) is a volatile compound. Arsine (AsH3) is also a volatile, poisonous gas. Using TriethylGa instead of TrimethylGa (TMGa) removes C better with the formation of ethylene gas as shown with the reaction below. MOCVD is the most advanced deposition
Inorder to form GaAs film, the raw materials are fed into MOCVD, by reacting TMGa with Arsine first. Advantage of using AsH3 in MOCVD is it cleans C in a better way
Though, MOCVD works well and is now a preferred process for making many Gr. III-V films or compounds such as (Ga-As), AlGaAs, InGaP, GaAsP, GaSb, GaInAs). Scientists have replaced poisonous Arsine gas with simple Arsenic metal and fed into the reactor as shown in above reaction method used is named as MBE (Molecular beam epitaxy.
DETAILS:
Growing Ga-As Thinfilm is a monumental task. The whole monolithic junction structure needs to be break down into sub components. Thin-film semiconductor industry expands market from making computer microchip to today’s solar panels. Everyone uses a cell phone now, it contains a semiconductor chip. Those chips actually come from Wafer. Using high-tech equipment various properties of wafers such as i) curvature, ii) temperature, iii) thickness, iv) roughness are maintained to its standard condition.
Need To Know:
1. Wafer: A wafer is a slice of substrate-thin slice of semiconductor material such as c-silicon
2. MOCVD technique is a higher quality deposition technique with advanced tools. MOCVD stands for Metal-Oxygen Chemical Vapor Deposition− is a technique for depositing thin layers of atoms on to a semiconductor wafer.
3. Device fabrication process knowledge: is a requirement to create IC that are present in everyday electrical and electronic devices. It is a multiple sequence of photolithographic and chemical processing steps during which electronic circuits are gradually created on a wafer made of pure semiconducting material. For IC, Si along with other compound semiconductors are used with specialized applications.
Inherent Problems with Thin Films:
#. Oxidation of GaAs thin film occurs with the air degrading the performance of the semiconductor. Surface needs to be passivated by depositing compounds such as GaS.
#. Growing large, high quality GaAs wafers and intimately integrating them on silicon or other substrates (such as glass or plastic) is expensive, which restricts their use.
#. Concentrating sunlight on solar panel with larger silicon cells is problematic because a cooling system must be used to conduct away the heat that this generates. This is problematic. Semprius’s company solved the problem by using small cells equipped with lenses. These produce so little heat that they don’t require cooling, which reduce the cost of the cell. For small cell produce, Semprius uses GaAS wafer.
Semprius: Pioneer in the Ga-As semiconductor production industry. A North Carolina based semiconductor industry produce electronic goods for large, utility-scale projects in places such as the American Southwest. The company raised enough money to mass produce its solar panels to generate and deliver 6MW and hopes to produce 30MW in near future.
Semprius’s designed small Ga-As cells, tiny cell sizes produce so little heat that they don’t require cooling, which brings down the cost of the solar cell. A small black square of Ga-As on each cell (see image) is the semiconducting material that keeps costs down by reducing the size of Ga-As film. John Rogers is the lead author of carrying research successfully publishing several authenticate reports in scientific journals. John Rogers see a great deal of potential in the future and the team developed cell design pointed out briefly below:
#Grow the cell on a GAAs wafer
600micrometer Wide, 600micrometer Long, 10micrometer Thick
#Press the stamp on the stack and lift them off quickly.
#Transfer GaAs to another substrate by stamping it in to the surface and peeling the stamp back slowly
#Reuse the wafer to make more cells.
References: 1. http://www.physorg.com/news193557233.html
2. http://rogers.matse.illinois.edu/files/2010/physorggaas.pdf
X-X
ENTERTAINMENT: Watch the video below on metal Gallium (Ga)
http://www.techinsider.io/gallium-safe-metal-liquid-mercury-2016-5
I was reading through some of your articles on this website and I think this site is real instructive! Keep putting up.
Hi,
Please, DONATE to save FB Solar LLC.com
FB/HOST
Really fantastic visual appeal on this internet site, I’d rate it 10 10.
Hi,
Please, DONATE to save FB Solar LLC.com
FB/HOST
Hi would you mind sharing which blog platform you’re working with? I’m planning to start my own blog soon but I’m having a difficult time deciding between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your design seems different then most blogs and I’m looking for something unique. P.S Apologies for being off-topic but I had to ask!
Hi,
Please, DONATE to save FB Solar LLC.com
FB/HOST
I appreciate, cause I found just what I was looking for. You’ve ended my 4 day long hunt! God Bless you man. Have a great day. Bye
Please. DONATE to save: https://www.fbsolarllc.com
The site needs some financial support from its users and commentators.
FB/HOST
Does your site have a contact page? I’m having problems locating it but, I’d like to shoot you an email. I’ve got some ideas for your blog you might be interested in hearing. Either way, great blog and I look forward to seeing it expand over time.
Thank you.
Contact page is under repair and available soon.
Talk to you then.
FB/Host
Hi,
Please consider ‘DONATING’ some money for the maintenance of this website, use the ling provided at the end of the BLOG.
FB: Host
I simply couldn’t leave your website prior to suggesting that I extremely loved the usual information an individual provide to your guests? Is going to be back incessantly in order to inspect new posts.
Thanks , I’ve recently been looking for info about this subject for a long time and yours is the greatest I have came upon till now. But, what concerning the conclusion? Are you positive about the source?
Lovely site! I am loving it!! Will come back again. I am bookmarking your feeds also.
I have read several good stuff here. Definitely worth bookmarking for revisiting. I surprise how much effort you place to create this sort of great informative web site.
You have remarked very interesting points! ps nice internet site.
I am often to blogging and i really appreciate your content. The article has really peaks my interest. I am going to bookmark your site and keep checking for new information.
It¦s really a nice and helpful piece of info. I am glad that you shared this helpful info with us. Please stay us up to date like this. Thanks for sharing.
After study a few of the blog posts on your website now, and I truly like your way of blogging. I bookmarked it to my bookmark website list and will be checking back soon. Pls check out my web site as well and let me know what you think.
Oh my goodness! an amazing article dude. Thank you However I am experiencing situation with ur rss . Don’t know why Unable to subscribe to it. Is there anyone getting similar rss drawback? Anyone who is aware of kindly respond. Thnkx
I have been checking out some of your stories and i can claim pretty good stuff. I will definitely bookmark your website.
Hello, you used to write magnificent, but the last few posts have been kinda boring… I miss your great writings. Past few posts are just a little out of track! come on!
Well I truly enjoyed studying it. This article provided by you is very constructive for accurate planning.
naturally like your web site but you need to test the spelling on quite a few of your posts. Many of them are rife with spelling issues and I to find it very troublesome to inform the truth on the other hand I’ll definitely come back again.
I have recently started a web site, the information you offer on this website has helped me greatly. Thanks for all of your time & work.
I really enjoy looking through on this internet site, it contains superb blog posts. “Never fight an inanimate object.” by P. J. O’Rourke.
Some truly wonderful work on behalf of the owner of this internet site, dead great content material.
My spouse and I stumbled over here by a different website and thought I may as well check things out. I like what I see so now i’m following you. Look forward to checking out your web page for a second time.
I feel that is among the such a lot vital info for me. And i am glad studying your article. However wanna remark on some general issues, The web site style is ideal, the articles is actually nice : D. Just right activity, cheers
Pretty nice post. I just stumbled upon your weblog and wished to say that I’ve truly enjoyed surfing around your blog posts. After all I’ll be subscribing to your feed and I hope you write again soon!
Hi there! This post couldn’t be written any better! Reading through this post reminds me of my previous room mate! He always kept talking about this. I will forward this article to him. Pretty sure he will have a good read. Thank you for sharing!
As a Newbie, I am constantly searching online for articles that can benefit me. Thank you
I’ve been exploring for a little bit for any high quality articles or blog posts on this kind of area . Exploring in Yahoo I at last stumbled upon this website. Reading this info So i’m happy to convey that I have an incredibly good uncanny feeling I discovered exactly what I needed. I most certainly will make certain to do not forget this web site and give it a glance on a constant basis.
Whats Happening i’m new to this, I stumbled upon this I have discovered It absolutely useful and it has helped me out loads. I am hoping to give a contribution & help other users like its helped me. Great job.
I have not checked in here for some time as I thought it was getting boring, but the last several posts are great quality so I guess I?¦ll add you back to my daily bloglist. You deserve it my friend 🙂
Just desire to say your article is as astonishing. The clearness in your submit is simply excellent and i could think you are a professional in this subject. Well along with your permission allow me to grab your RSS feed to stay updated with drawing close post. Thanks 1,000,000 and please keep up the enjoyable work.
Glad to be one of many visitors on this awe inspiring internet site : D.
I like this web blog very much so much excellent information.
It’s best to participate in a contest for among the best blogs on the web. I’ll advocate this site!
I’m now not sure the place you are getting your information, however good topic. I must spend some time studying more or understanding more. Thank you for magnificent information I used to be searching for this information for my mission.
Regards for this fantastic post, I am glad I found this site on yahoo.
It’s a shame you don’t have a donate button! I’d most certainly donate to this superb blog! I suppose for now i’ll settle for bookmarking and adding your RSS feed to my Google account. I look forward to fresh updates and will share this site with my Facebook group. Talk soon!
Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You obviously know what youre talking about, why throw away your intelligence on just posting videos to your site when you could be giving us something informative to read?
What¦s Taking place i’m new to this, I stumbled upon this I’ve found It positively useful and it has helped me out loads. I hope to contribute & aid other customers like its aided me. Good job.
This actually answered my drawback, thank you!
Superb website you have here but I was wanting to know if you knew of any discussion boards that cover the same topics discussed in this article? I’d really love to be a part of online community where I can get suggestions from other experienced people that share the same interest. If you have any suggestions, please let me know. Kudos!
I gotta favorite this website it seems very helpful very beneficial
I?¦m no longer certain the place you are getting your info, however good topic. I needs to spend some time learning more or understanding more. Thanks for fantastic info I was looking for this info for my mission.
you are really a excellent webmaster. The website loading velocity is amazing. It sort of feels that you’re doing any distinctive trick. Also, The contents are masterwork. you have done a excellent task on this topic!
Well I truly enjoyed studying it. This subject provided by you is very constructive for correct planning.
Valuable info. Lucky me I found your site by accident, and I’m shocked why this accident did not happened earlier! I bookmarked it.
Hello my loved one! I want to say that this article is amazing, nice written and include approximately all significant infos. I?¦d like to look extra posts like this .
It’s a pity you don’t have a donate button! I’d without a doubt donate to this excellent blog! I guess for now i’ll settle for book-marking and adding your RSS feed to my Google account. I look forward to fresh updates and will share this blog with my Facebook group. Chat soon!
Hello There. I discovered your weblog the use of msn. That is a really smartly written article. I will make sure to bookmark it and return to learn more of your helpful info. Thank you for the post. I will definitely comeback.
Wow, superb weblog structure! How long have you been blogging for? you made blogging look easy. The total glance of your web site is magnificent, let alone the content material!
I’m impressed, I need to say. Actually hardly ever do I encounter a blog that’s both educative and entertaining, and let me inform you, you could have hit the nail on the head. Your concept is outstanding; the problem is one thing that not enough persons are talking intelligently about. I am very joyful that I stumbled across this in my seek for something regarding this.
I would like to thnkx for the efforts you’ve put in writing this blog. I am hoping the same high-grade site post from you in the upcoming as well. In fact your creative writing abilities has encouraged me to get my own site now. Actually the blogging is spreading its wings rapidly. Your write up is a good example of it.
You are my inhalation, I possess few blogs and very sporadically run out from to post .
Thanks for the sensible critique. Me and my neighbor were just preparing to do a little research on this. We got a grab a book from our area library but I think I learned more clear from this post. I’m very glad to see such magnificent info being shared freely out there.
Does your site have a contact page? I’m having trouble locating it but, I’d like to send you an email. I’ve got some recommendations for your blog you might be interested in hearing. Either way, great blog and I look forward to seeing it improve over time.
Hi,
Thank you for your comment.
You are most welcome as you planned to email me your thoughts for improvement of this blog.
I’ll wait here to listen from you soon.
Sincerely,
Fouzia (blogger)
I like this web blog its a master peace ! Glad I observed this on google .
I rattling glad to find this site on bing, just what I was looking for : D also saved to favorites.
I would like to thnkx for the efforts you have put in writing this blog. I am hoping the same high-grade blog post from you in the upcoming as well. In fact your creative writing abilities has inspired me to get my own blog now. Really the blogging is spreading its wings quickly. Your write up is a good example of it.
Great wordpress blog here.. It’s hard to find quality writing like yours these days. I really appreciate people like you! take care
On the other hand investments involve excessive risk and the
return on investment are high as compared to savings.
Customizable protection options for businesses of all types
and sizes.
Just wanna comment that you have a very decent site, I love the style it actually stands out.
Hello! I could have sworn I’ve been to this blog before but after browsing through some of the post I realized it’s new to me. Anyways, I’m definitely happy I found it and I’ll be book-marking and checking back frequently!