Difference between revisions of "User:Cov"

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W5: Undecided between (semi) conductor in polymer, some in the polymer, some wet, all wet with resins/binders, and all wet with just hot plastic making everything stick in place.
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W4: For variability, shelf-life (oxidation) and constant deposit rate are key. Test patterns on silicon for after-the-fact. Resistance testing is useful/common. Laser cutter can oblate/cut sections and rely on a redundant section. Acid etching may be possible. Heating and removal may be possible. "MISFET" metal-insulator semiconductor field effect transistor. Schottky diode--metal (Schottky)-semiconductor-metal (ohmic) sandwich. Work function of metal versus electron affinity in semiconductors essentially the same. Bonds covalent. Electrons move into metal and becomes less [pn]-type. Barrier forms where electrons left and voltage happens. Difference in other direction causes flow of electrons and ohmic contact. Can either vary metal or doping. Lookup leaky / Schottky diodes versus regular pn-junction. Schottky transistors also possible.
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In the end we want CMOS to save material. NAND CMOS is 4 transistors. TTL has 3 transistors and 4 resistors. Also, CMOS has much better fanout. Look into verilog/VHDL output.
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For Thursday: carbon. Keep thinking about deposition method. Get transparencies from John.
 
 
 
W3: Deposition method. Automatic dropper? Like an aquarium pump but very small. Called automated pipettes. Sticking to the sides depends on the charge, but Meehan hasn't encountered problems--gold and cadmium sulfide don't.
 
 
 
W2: Carbon as the Conductor material (and potentially resistors, capacitors and inductors)
 
Step 1: Put a wire on a substrate (paste or liquid preferable to powder)
 
 
 
W1: document material and process choice, investigate printing, inert substrate
 
 
 
=Materials and Processes=
 
{| border="1"
 
|-
 
! Material
 
! Doping Process
 
! Notice
 
|-
 
| Silicon
 
| Mix in during boule creation and ion implantation (particle acceleration with phosphorus or arsenic and boron or gallium) or furnace with gas (diffusion)
 
| Need at least 10 kEv. Heat treatment for recrystallization (electrical activation) afterwards. Silicon dioxide mask for gas
 
|-
 
| Organic semiconductors
 
| Beaker chemistry, dissolve into solvent
 
|
 
|-
 
| Graphene
 
| Doping during furnace and gas formation
 
|-
 
| Zinc sulfide
 
|
 
|-
 
| 2-6 semiconductors
 
| Beaker chemistry, small particle slurry
 
|-
 
|}
 
 
 
=Conductor=
 
* Carbon, gold don't oxidize
 
* Aluminum, silver, copper
 
 
 
=Recycling=
 
* Electroplating to recover metals (different voltages for different metals)/
 
* Size-selective precipitation technique if p, n had different sizes
 
* Selective etches
 
* Focused ion beams to bombard off surface
 

Revision as of 05:04, 7 November 2013

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