Questions tagged [silicon]
32 questions
10
votes
1 answer
Why do silicon wafers look rainbow colored?
. Image taken from Can somebody identify this 12" silicon wafer?
So this silicon wafer looks multicolored (and beautiful). But how does it get multicolored like a rainbow? What is the reason for this phenomenon?
Shashank V M
- 2,279
- 13
- 47
6
votes
1 answer
Why do NPNP thyristors remain on but NPN transistors don't after gate voltage is removed?
My understanding is that when a positive voltage is applied to the gate in a thyristor, the P region can store excess electrons which can then move to the n region. I don't understand why it continues to function after the gate voltage is removed,…
Alekk
- 65
- 4
5
votes
2 answers
Inside a 2N3904 transistor TO-92 package
I cracked open this 2N3904 transistor. I lack the means to test its function until tomorrow.
The die doesn't look like anything I've ever seen before. I'm not quite sure where the silicon is.
In your opinion, does the back half of the transistor…
Aaron Butkovich
- 353
- 1
- 7
4
votes
1 answer
Using 1N4148 as temperature sensor for absolute temperature
Please forget the "why" for now, but I am attempting to determine the temperature of a 1N4148WS-E3 part by doing two measurements at different current setpoints. I've done some tests and some calculations and I don't understand where the error is…
Graafvaag
- 61
- 4
4
votes
3 answers
Why are there no P-channel SiC (silicon-carbide) FETs?
Looking at the top distributors, seems only N-channel power SiC are carried. Why is that?
rdtsc
- 15,913
- 4
- 30
- 67
3
votes
5 answers
Are semiconductors (specifically silicon) the only materials that can be used for making image sensors in digital cameras?
Could no other type of materials be used even if it means an entirely different sensor design or layout?
LucaMancini
- 49
- 2
3
votes
0 answers
Why do we use silicon in the crystal direction [1 0 0]?
In MOSFET, we use silicon in crystal direction [1 0 0] , while we use direction [1 1 1] in BJT. What is the reason? I expect the opposite, because we see more atoms on the surface in the direction [1 1 1] and so diffusion of atoms is very harder.…
mohammad rezza
- 442
- 1
- 11
3
votes
2 answers
Why is CVD not used in the manufacture of NMOS gate oxides?
I know that chemical vapor deposition (CVD) is a vacuum deposition method used to produce high-quality, high-performance solid materials. The process is often used in the manufacture of semiconductors to produce thin films, there are several CVD…
LUFER
- 363
- 1
- 2
- 9
3
votes
1 answer
Calculation for IC lifetime for supply voltage overvoltage
What calculation can be used to calculate the lifetime of an embedded processor (<28nm process) when subject to a slight overvoltage?
The supply rail in question is for analog portions of the circuit (Clock PLL and SerDes receive).
0.87 to 0.93V -…
Jack Bourne
- 51
- 3
3
votes
1 answer
Can somebody identify this 12" silicon wafer?
I just bought a silicon wafer off of eBay to decorate my office. The seller didn't tell/know, but I'm dead curious as to what this wafer is. Could anyone help me identify which chips should have been built out of it?
Full picture
Here's a picture of…
Romain
- 31
- 3
2
votes
3 answers
How does one manufacture a P-N junction?
When I read a physics textbook about a P-N junction, it will tell me that you connect a p-doped semiconductor to an n-doped semiconductor, and you form a depletion region.
However, from what I know about silicon wafer manufacturing, wafer producers…
Roy
- 123
- 4
2
votes
1 answer
In an intrinsic semiconductor, are there the same number of carrier electrons and holes? Or this is just exclusive for silicon?
I am working with some polymers that behave like semiconductors when they are plugged into the current.
I am calculating the mobility of these polymers and I need the value of the current density (J) in order to achieve it.
I have found that the…
Abdel Ruvalcaba
- 31
- 1
2
votes
4 answers
Silicon-free amplifier
I'm working on building a silicon free computer and I need a way to store information after power off. Right now, solid core memory seems like the best option. However, the sense line of solid core memory produces a very small pulse of electricity…
Firewolf
- 67
- 5
2
votes
1 answer
Silicon Labs CP2102 usb recognition error
Good Morning everyone,
I have recently designed a circuitry design for the named chip "CP2102N-A02-GQFN24". Problems appear after connecting the chip to the computer. It doesn't get recognised properly. It shows that the connected device is not…
Paul
- 131
- 6
2
votes
2 answers
starting material for silicon production
Where does silicon semiconductor manufacturing start from? I mean, what are the principal ores that may be used to start the technological process and what extraction process is used? (And what are the principal countries that extract such ores?)
I…
trying
- 102
- 5