Talk:Molecular-beam epitaxy

Lattice strain

I have read suggestions that by putting a superconductor under high strain, the critical temperature appears to increase. I suggested to a researcher in the physics department, working on MBE, that perhaps that could be something he could look into with regards to lattice mismatch, and being able to fix the strain in place without any outside mechanical influence.

I'm not sure if any work has been done on that, or if it'd even be possible, but I was reminded of it when I read the end of the article. I'd be interested to hear from anyone who works with MBE about the feasibility of doing so. —Preceding unsigned comment added by 86.160.105.44 (talk) 15:49, 28 January 2011 (UTC)[reply]

Incorrect growth rate

Is the mentioned growth rate 1000 nm per minute correct? Google search gives articles with the rate about 500 nm per hour. 80.188.247.76 (talk) 20:51, 7 June 2008 (UTC)[reply]

another source: "Typical MBE growth rates are 1 Å per second, this equates to one atomic layer per second". We have 360nm from here. —Preceding unsigned comment added by 156.17.226.200 (talk) 00:13, 8 February 2011 (UTC)[reply]

1000 nm per hour is pretty typical (anywhere from 500 nm per hour to 1500 nm per hour is reasonable). Certain materials can be grown faster or slower, depending on the kinetics involved. Sethbank (talk) 06:01, 3 July 2012 (UTC)[reply]

Illustration

This page could use an illustration --Unclevortex 21:22, 29 May 2005 (UTC)[reply]

It has one now :) (although some sort of diagram showing how the process works would be cool too...) --Wulf 21:07, 11 January 2006 (UTC)[reply]

I recently made a new version of the concept sketch:

1. Beam Flux Monitor, 2 Substrate (Green) Heating Element (Red), 3 RHEED gun, 4 Heating Coils, 5 Effusion Cells, 6 Mass Spectrometer, 7 RHEED Screen, 8 Cryo Panels, 9 Ionization gauge, 10 Mechanical Feedthrough for CAR assembly, 11 To Buffer Chamber

I'm not sure which is better for use here. If the community thinks the labels are better than the numbers I'll see if I can get Inkscape to agree with me on how the output file should look. El.vegaro (talk) 20:31, 12 October 2011 (UTC)[reply]

Looks very nice either way -- thanks! I will also take a few pictures when I have a chance. A13ean (talk) 13:45, 13 October 2011 (UTC)[reply]

The Beam Flux Monitor would be of no use where it is shown. It must be inserted into the beams for calibration and then removed. Also, the Mass Spectrometer wouldn't do well down there at the bottom, typically on a port the chamber is being pumped down with, sometimes a nearby processing chamber. --DrMemory 08:27, 23 Feb. 2013 (UTC)

Linked

[Wired] used this as an article link. Daemon8666 15:10, 11 January 2006 (UTC)[reply]

Yeah, they use Wikipedia links a lot :) --Wulf 21:04, 11 January 2006 (UTC)[reply]

Incorrect facts

Molecular beam epitaxy was actually first developed by Gunter in 1958 K.G. G\"{u}nther Aufdampfschichten aus halbleitenden III-V Verbindungen Z. Naturforsch. 13a (1958) 1081-1089

...and actual epitaxial deposition by Davey in 1968: J.E. Davey and T. Pankey Epitaxial GaAs Films Deposited by Vacuum Evaporation J. Appl. Phys. 39 (1968) 1941-1948

This may be correct. The earliest paper on the subject by Cho that I could find (J. Appl. Phys v41 p2780) references the above articles, though I have not read them. I do believe that Cho is commonly viewed as a pioneer of the technique. Sewebster 07:14, 24 November 2006 (UTC)[reply]

There is a presumption of validity with a granted patent. Dr. John R. Arthur was named as first inventor (along with Dr. Al Y. Cho) on the US patent for the invention of molecular beam epitaxy. —Preceding unsigned comment added by 12.140.244.138 (talk) 22:53, 7 July 2008 (UTC)[reply]

Alfred Y. Cho

Cho has several awards for his MBE work which was one of the most important techniques for the realisation of opto and high frequency GaAs devices. He received the US National Medal of Technology in 2007; Cho had already picked up the National Medal of Science back in 1993.

Cho switched to Bell Labs in 1968, where he hooked up with John Arthur to work on GaAs.

"I wanted to combine the ion propulsion knowledge with the surface physics knowledge to form a viable new crystal growth technology - MBE," explained Cho.

As IntelliEpi CEO Yung Kao told Cho, the beauty of MBE is its flexibility - it can be used for state-of-the-art nanostructure development, but also commercial IC production.

The innovations will surely continue – MBE has also been identified as one of the key technologies to ensure that silicon chip makers can continue to follow Moore's Law, because the technique can be used in advanced processing to deposit high-k gate dielectrics and metals.

http://compoundsemiconductor.net/cws/article/news/30691

In 2006 Veeco Instruments Inc., one of the leading MBE equipment manufacturers, announced its co-sponsorship of two major MBE awards: the Al Cho Award and the MBE Innovator Award. Initiated in 2004, the Al Cho Award, is presented in early-September at the International MBE Conference.

http://www.sciencedirect.com/science?_ob=RedirectURL&_method=externObjLink&_locator=url&_plusSign=%2B&_targetURL=http%253A%252F%252Fwww.mbe2006.all-nano.waseda.ac.jp

Another MBE equipment maker, Riber, of France, in 2004 announced that the first recipient of the RIBER/NAMBE sponsored "Al Cho" award was Professor C. Thomas Foxon of the Department of Astronomy and Physics at Nottingham University in the UK. The award recognizes an outstanding contribution over a sustained period of time by an individual or individuals to the understanding of the MBE process and to the realization of its potential as an enabling technology. His pioneering work on MBE growth mechanistic studies and the preparation of some of the very first truly ultra high mobility MBE heterostructures at Philips Laboratories in Redhill and more recently his work on GaN materials and Spintronics at Nottingham was, and continues to be, very instrumental in stimulating and maintaining the interest of generations of MBE scientists and technologists the world over. At the Philips Research Laboratories, in collaboration with Prof Joyce, he began the first work in Europe on the growth of III-V semiconductors by Molecular Beam Epitaxy (MBE), and at Nottingham University, in collaboration with Prof Orton, he established the first work in Europe on the growth of group III-Nitrides by MBE. C. Thomas Foxon has been one of the world key MBE scientists for 35 years. During this time he has filed several patent applications, co-authored over 500 publications, many invited talks and numerous other presentations in international conferences.

He fabricated the first MBE artificial superlattice, the first MBE hyper-abrupt junction varactor, IMPATT diode, mixer diode, field effect transistor operating at microwave frequencies, and the first MBE double- heterostructure laser operating cw at room temperature.

http://www.ieee.org/web/aboutus/history_center/biography/cho.html

I reckon this guy deserves a WP page all to himself!

Latest one to receive the Cho Award was University of Illinois' Department of Electrical and Computer Engineering Professor Norman K.Y. Cheng has received the MBE Innovator Award, a recognition that acknowledges individuals whose innovative work has significantly advanced the field of molecular beam epitaxy (MBE).

Cheng accepted the award at the North American MBE (NAMBE) conference Sept. 25 in Albuquerque, New Mexico. The award presented to Cheng included a $3,000 honorarium and engraved plaque. A citation given at the presentation, attended by more than 200 people, said Cheng made "outstanding contributions to the development InGaAs-based heterostructures for ultra-high-speed devices and pioneering work in III-V dilute nitride semiconductor alloys in addition to his invention of rotating substrate holder used in MBE systems."

Cheng. "I’ve learned a lot of things from Al Cho - not only restricted to the research, but in ways of dealing with research topics. I think students are also an important part, and I appreciate their help. In collaboration with Professor Milton Feng, Cheng is also making a new version of the heterojunction bipolar transistor (HBT), a device that can handle signals of very high frequencies over five hundred GHz with a high power handling capability."We’re reaching the world record, almost 700 GHz,” said Cheng. "We’ll deliver the results at this year’s International Electron Device Meeting (IEDM) in December in Washington D.C. It is the most prestigious conference for new devices."

http://www.ece.uiuc.edu/news/headlines/hl-cheng-mbe.html

Royzee (talk) 18:40, 3 March 2008 (UTC)[reply]

Alfred Y. Cho already does have a WP page to himself :) --KJ Cheetham 3 May 2008 —Preceding comment was added at 17:23, 3 May 2008 (UTC)[reply]

Addition of information

This page really needs more information about the specifics of MBE. The CBE (chemical beam epitaxy) page actually has better info about MBE than MBE's own page. —Preceding unsigned comment added by 128.61.35.109 (talk) 04:15, 20 October 2008 (UTC)[reply]

Poundel?

Whoever added the word "Poundel" to the beginning of the article should justify its usage. --Shanedidona (talk) 21:22, 9 December 2010 (UTC)[reply]

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Image

Does this image fit within the article? The description says only "MBE at IICO". Wouterhagens (talk) 19:31, 13 November 2021 (UTC)[reply]

It's a UH vacuum chamber for sure, but I don't see any MB epitaxy sources there, so I'd say no, it doesn't illustrate MBE that well. Ponor (talk) 00:07, 14 November 2021 (UTC)[reply]