Used in the first computer—EniacTook up lot of spaceGenerated lot of heat (Cathode ray tube) -- Heat cause it to deteriorate easily -- Frequent replacementUsed as transistor Transistor is a switch with no moving part two states, ON or OFF
GaAs-- Eventually, used in TV, Microwave and otherSilicon was chosen due to the fact it was cheaper and abundantly available
States that the number of transistors on an integrated circuit doubles about every two year--this helped up invent innovative technology--make things fasterPossibilities of silicon are over exhaustedNot a suitable choice for mobile devices
Reduces the number of control gates --reduces the size of the transistorDone with silicon todayGenerates heatMemory leak since they are packed togetherEmma and kursun – researchers @ ibm said its only and extension of moore’s law
Researcher at the Department of defense is researching with GaAsGenerates a lot of Heat, therefore a good choice for solar panelsUsed in solar panels, cell phone towers, TV, microwaves and satelites
Umesh K. Mishra researcher at UC santabarbara created a GaN transistor -- in the process he realized the larger band gaps allows for faster data transfer -- large critical breakdown field indicates that it is durable -- having a low thermal means it produces less heat than silicon
No bandgap allows electrons in graphene to roam freely -- also a bad thing because they will require an external device to control the elctronsGraphite is used in pencil initially from carbonRequires a high quality of graphiteDCT process -- graphene is pressed onto silicon -- increases the footprint of the transistor because graphene is so thin
Vacuum Tubes to Silicon and beyond
Vacuum Tubes to Silicon and beyond<br />Faridi Qaium<br />Computer Science<br />
Replacement for Vacuum tubes<br />Gallium arsenide<br />Silicon<br />Very powerful<br />Large energy gap<br />Has capability of transmitting light<br />Does not react to extreme temperature condition<br />Made from sand<br />Strong and durable<br />Cost effective<br />
Expensive</li></li></ul><li>Graphene<br />Made from graphite<br />No bandgap<br />Memory leak<br />No mass production technique yet<br />Hard to manufacture<br />
Research design<br />Create a wafer of Graphene transistors<br />Stack them on top of each other<br />Insert carbon nanotubes as a method of control structure<br />Carefully chose an algorithm to control these gates<br />Finally test the chip by using it in a live system and compare the performance against its silicon counter part<br />
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