A quick list of pictures. Pardon any inconsistencies with concepts and/or vocabulary.

MBE_Controls.jpg the computer controls for the MBE (Molecular Beam Epitaxy) system

QTVR99.mov A QuickTime Virtual Reality scene of the cleanroom. A quick one - not done right. More to come. Go to http://www.quicktime.com for the viewer.

analystical_system.jpg Yes, yes. A speeeeeling error. This is a bunch of equipment that analyzes something. I forget what.

antimony.jpg The MBE that makes antimony based semiconductors. One million dollar machine.

boyle.jpg That's Tom Boyle suiting up.

cleanroom.jpg Actually not THE cleanroom - this is the Materials Growth Lab that I worked in.

cleanroom2.jpg Notice the big white tank? Liquid Nitrogen.

do_not_feed_the_animals.jpg It's a zoo out here.

gt99-35.jpg More lab shots.

liquid_nitrogen.jpg Just cooling off.

liquid_nitrogen_vacuum_lines.jpg These are cool. Inside each of those silver snake looking things is a small tube that carries the liquid nitrogen. In between this inner tube and the outer snake-like silver part is a vacuum that is maintained with a vacuum pump. The vacuum insulates the nitrogen from the room temperature and vice versa. First, this makes it safe to touch (touching metal that's the temperature of liquid nitrogen gives you immediate 3rd degree burns) and keeps ice from forming all over the place (like in your freezer).

mbe_evaporators.jpg Those cylinders coming off the big metal thing are the MBE evaporators. They evaporate things like phosphorus, antimony, arsenic, silicon, etc. (Or nearly any thing else you can imagine.) About $10,000 apiece. They have two more on another system that are much better. But they only have two because they cost about $70,000 apiece!

me.jpg Duh!

gt99-47.jpg Me again.

microngraphs.jpg The black and white photos to the right were taken with the Scanning Tunneling Electron Microscope (STM). The bottom right picture shows little bumps. Those bumps represent individual atoms. (I believe the sample was graphite, so they are carbon atoms.)

nitride.jpg The nitride based MBE machine. One million dollar machine.

pcd.jpg PhotoConductive Decay Lifetime. Tests for specific energy bands in the semiconductor. Ask me to explain it to you if you wish.

pcdclose.jpg Same as above, but close up. The laser off the the right is a 4 megawatt pulse laser! (I think that value is right) capable of infrared, visible and ultraviolet. Yes, it will burn things.

photolithography.jpg A technique for etching semiconductors. Just like stenciling, but different. Put a mask on top of a semiconductor chip, expose it to ultraviolet light which changes the chemical properties of the chip, then give the chip a bath in acid so that the exposed or unexposed parts are etched off the chip. This lab is capable of making lines at the order of about 2 microns. (1 micron is 0.000001 meters or 0.000039 inches.) The yellow light has something to do with cutting down on ultraviolet light from the fluorescent lights.

photolithography2.jpg The whole room.

cleaner_photolithography.jpg This is the cleanest photolithography lab. This lab is capable of etching around the order of 1 micron.

plasma_deposition.jpg I think that's what the name of this lab was. They use plasma, but I can't quite remember how.

scanning_tunneling_microscope_enlarged.jpg Scanning Tunnelling Microscope (STM). Photo of a photo. The whole unit is smaller than a dime. Real science!

scanning_tunneling_microscope_soundproof_chamber.jpg This is the sound proof room in which the STM is made. The STM is at the bottom of the long pole on the left. The silver tank is a tank of liquid nitrogen (LN2) at about 77 Kelvin (-321 F). The pole is submerged in the LN2 to bring the temperature down. Sometimes they use liquid helium for a temperature of 7 Kelvin (-447 F). When the pole with the STM is pulled out of liquid helium, the air from the room that is around the pole turns into liquid and pours out onto the floor, where it immediately boils back into the air. It's in a sound proof chamber because if the sound vibrations move it by one angstrom the results, sample and needle can be ruined. One angstrom is 0.000000001 meters or 0.0000000039 inches.

uv_metal_organic.jpg A new type of machine that the group is working on. Two years in the making.

UV__metal_organic_closeup.jpg Same thing as above, close up. The circular plate of glass costs $2,000. They hope this system will work.

vacuum_cleaner.jpg Not your ordinary vacuum cleaner!

closeup_vacuum_cleaner.jpg Always read labels twice.

vaporizor.jpg This is use for the STM. It vaporizes various samples. Mostly used for vaporizing gold. Correction: Minus 5 points for vocabulary! Here's an email from Dan Guthrie, the guy who built this stuff:

All looks good except fo rthe vaporizer...should be evaporator. For a little info on the evaporator, it works by running DC current through a small diameter wire of tungsten which has gold wire wrapped around it. The gold is wrapped at a place where the wire is bent to a hard 90 degrees. The current running through the bend causes it to heat up (due to the increased resistance caused by the bend) and the gold melts into a ball which is liquid and then evaporates spherically and coats everything around. We typically deposit at around 0.5-1.0 Angstroms per second!!! This is measured using what is called a quartz crystal monitor. A small round thin disc of crystallin quartz has electrodes placed on both sides and w/ the applicaiton of a voltage the crystal oscillated at a give frequency...ie 5 MHz...when the mass changes (ie you deposit gold onto it), the resonanace frequency changes (increases i think). The rate of change of the frequency can be converted into the change in the mass, which w/ the proper density of the material being deposited, can be converted into a growth rate!!! too cool huh? anyway, likely more than u wanted to know...

warning1.jpg Always read labels twice.

warning2.jpg Always read labels twice.

warning3.jpg Always read labels twice.

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