The Study of Si Surface Structures Essay examples -- Science Experimen

The discover of Si Surface Structures The goal of this study is to determine the ratios of surface instance upon the Si sample. Data is collected from the Si samples using SPALEED. By analyzing the info from dates where combined surfaces are present it is possible to determine the amount of original types of surfaces present on the sample. The ultimate goal is the ability to control the fruit of Pb islands upon the Si crystal. Applications of this research include the design of advanced microprocessors and quantum wires. induction The goal of the REU project to which I was assigned is to determine the amounts of plastered types of crystalised surface organises present upon the Si crystal that had been used in preceding experiments involving the formation of Pb islands at low temperature. This is accomplished by analyzing certain(prenominal) aspects of the info collected by Spot Profile Analysis imprint Energy Electron Diffraction (SPALEED). The data sets are taken fr om different experimental runs involving various surfaces and are compared to one another. These surfaces include combined types of surface structures as well as those with only a single surface structure present. Background and Experimental Procedure Within ultra-high vacuum and at truly low temperature, a Si crystal is placed. This crystal is heated by use of a tungsten filament to high temperatures in shape to eliminate impurities. The Si is then heated again at certain temperatures and for particular(prenominal) durations of time in order to create particular microcrystalline surface structures. Atoms of Pb are then deposited upon the Si crystal by a process of evaporation. The amount of Pb deposited is known and is mea veritabled in terms of monolayers, or layers of Pb upon the surface measu... ...is known through previous experiments that the surface of the Si upon which the Pb is deposited lot change the height of the Pb islands formed. By altering the silicon surface upon which the Pb is deposited it is hoped that the Pb islands can be controlled.The hope is that the work here can help pave the way for computer chip architecture in the next lambert years. If the Pb islands can be deposited evenly and placed in specific locations it is believed that they can be use as quantum wires, dramatically increasing the advance of the silicon chip computer. At this time the data is promising. With more data and further analysis the problems of controllable Pb island formation are sure to be solved. The use of Scanning Tunneling Microscopy and SPA-LEED are the keys to unlocking the mysteries of the Si surface and its connection to the formation of the Pb islands.