Silicon Definition and 177 Threads

I am doing a side project with some doped silicon wafers. What precautions should I take when handling wafers? Is it necessary to wear gloves and use deionized water when rinsing the wafers?

How does the crystalline structure of silicon make it useful in solar panels? Why is carbon not used?

I've been doing a bit of reading on bandgaps of semiconductors and alloys of semiconductors. I was curious to know is the bandgap of a material, say Silicon, determined or calculated experimentally? How do scientists usually determine this in the lab?

Long story short, I'm working on a senior design project this semester, (involves converting a gassified biomass to a liquid ethanol using a palladium catalyst embedded in a silicon microporous matrix). I'm currently struggling what should be a fairly basic equation, but it's been too long...

Fairbanks Alaska is a long ways from Palo Alto, California. I was born and raised pretty much right "down the barrel" of the Stanford Linear Accelerator. When I was in fifth grade at Las Lomitas Elementary school, our teacher, Mrs. Tendick, took us on a field trip of SLAC before it was...

Hello! I was wondering what would happen if you placed a piece of undoped Si in an external electric field (say, between the plates of a capacitor) under illumination. Would it generate current? I'm essentially trying to understand if a large enough external electric field could split an...

Hey everyone I'm new here and this is my first thread, although i have great interest in chemistry and physics my knowledge of these fields is very basic( I'm graduated in economics) so don't be surprised if i ask something that may look silly. so here are my firsts questions. -Is it...

Hello I am trying to fabricate a Si reflecting solar cell. When a Solar cell is exposed to radiation and connected to external circuit, the current will start to flow through the circuit. So I want to know how does the Reflectivity of silicon change with the current( or conductance).[...

Hello everyone. I am a Hungarian born Australian theoretical/applied physicist. This is my first post on the forums. I am aware that silicon carbide crystal occurs in many different crystalline forms. I was wondering if someone here could please point me to a source that catalogs the...

So Yves Couder have these silicon droplets bouncing on a vibrating surface of some liquid: ...and apparently they can produce some things quantum particles do, like double slit fringe pattern trick. The question is how does that translate to 3D and would it still work? I mean, instead of...

Homework Statement Determine Vout, the current flowing through R and power power dissipated the Zener diode. Homework Equations Circuit analyzing techniques. The Attempt at a Solution I've done this problem by assuming each diode is off while ignoring the other. E.g...

what I've been told there is two groups of energy levels called the valence and the conduction band. what is the fermi level for silicon? how wide is the band gap for silicon?

what are the alternatives to silicon chip?

When we connect P and N materials, electrons from N drift to P, thus create negative ions in P and positive ions in N. => electric field (barrier potential) must depend on an amount of electrons recombined with holes in P region. => The more electrons recombined, the more ions created, the...

Homework Statement In a silicon junction diode, the region of the planar junction between n-type and p-type semiconductors can be approximately represented as two adjoining slabs of charge, one negative and one positive. Away from the junction, outside these charge layers, the potential...

Trouble replicating a calculation in "Silicon Nanoelectronics" I'm reading the textbook "Silicon Nanoelectronics" and I've encountered an equation for the transmission probability, which you can see among the attachments. In this equation, T is the transmission probability for a...

Silicon has 14 electrons, this means if it fills up its first two shells it will have 4 electrons in the outermost shell (These are the valence electrons). This shell can have 18 electrons in it, so silicon can have 14 more electrons in its outermost shell. This means it could...

I want to know ... what happens to silicon when some impurity is added to it. Where does silicon goes??

Homework Statement Find the theoretical binding energy of the hydrogenic acceptor state in Si (eg, as produced by Aluminum impurities), using hole mass 0.39 and permittivity 11.8. Homework Equations E_b = \frac{k_c e^2}{2a_0} \\ a_0 = \frac{\hbar ^2}{mk_c e^2} The Attempt at a...

Moore's Law will not continue indefinitely because the silicon-based processing units can only go so small. If computing plateaus at the point where the next computer is equally as fast as the last one, what would drive consumer demand? Why would you buy a new computer that is just as fast as...

Homework Statement As part of the initial treatment for waste water from an industrial site, you will be running the afluent through a sand filter. The filtering ability of the sand in this filter is roughly proportional to the surface area of the sand enclosed. The grains of fine sand are...

Hello everyone, I would like to buy some Si wafer with SiO2 layer on it. The manufacturer told me that they obtain the SiO2 with a wet oxidation process. My question is, would this layer be amorphous or crystalline or polycrystalline? Thanks!

Are they the same? Quartzite is found in the nature as the rock form. The colors are, some light brown, and some transparent. Silicon dioxide is a powder, its color is white. What is a silica? Is there available a picture/image of a silica? I have a mix of rocks such as below...

can anyone please explain this property of silicon: An excellent oxide as the low-refractive-index cladding material. thanks

My question has to do with Sputtering Silicon onto a substrate using DC without a Magnetron. The system in the lab I'm at isn't currently capable of RF sputtering and the status of the magnetron is unknown. Is there any way to use a sputter with DC to deposit Silicon onto a substrate? On the...

Homework Statement The forward bias current I in the diode described (silicon p-n junction) varies as a function of the voltage V and temperature T described by the formula I = I_s*|e^[(|e|*V]/[n*k_b*T]) - 1| where |e| is the fundamental charge, k_b is the Boltzmann constant, I_s is the...

hi there, I'm currently facing a problem with the silicon rectifier, http://www.alldatasheet.com/datasheet-pdf/pdf/35499/RECTRON/6A8.html with the current setup which is at the attachment. The source is a AC current of 230V 50Hz , while the cap is at 0.3μF. The setup is to provide...

Homework Statement One of the conditions that we must obtain for us to use the lumped circuit abstraction is that the timescale of interest in analysis of the circuit must be greater than the speed of electromagnetic propagation. What was discussed in class was how much greater. The answer...

I am looking for an alpha detector to do an alpha spectroscopy (and maybe beta as well). The rough setup is a vacuum tube with a detector in one end and a source in the other, possibly with a magnet in the middle. I have googled around, but my problem is that I don't really know what is...

Hi, I am currently taking a course on electronics and not quite sure of what ideality factor really means...what does ideality factor indicates actually? And the crucial part is what is the ideality factor of Silicon and Germanium? I've googled and found no relevant results are given other...

Hi, Given that the band-gap of a silicon PV cell is 1.1 eV, what is the maximum wavelength of solar energy (minimum frequency) required forming an electron-hole pair (EHP)?

I am intending to perform extended absorption fine structure (EXAFS) experiments on a thin film in order to investigate the near order around Europium ions. The thin film is going to be deposited on a silicon substrate, and the question is in reality related to how thick the substrate should be...

Homework Statement This is Purcell 4.12... Given that conductivity in silicon at 500K is 0.3 sec-1, deduce the mean free time between collisions of an electron. Homework Equations Electron mass is 9.1x10-28 grams (mass of a hole is exactly the same), the charge on an electron is...

Homework Statement Compute the wavelengths in fused silica and in silicon for photons whose free-space wavelengths are 800 nm, 1300 nm, and 1550 nm. Homework Equations This is the problem, I'm not sure what equation to use and the textbook does not seem to say, well what little I have of...

Homework Statement Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.6 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual spheres)...

Hello, I need a small cageless, angular contact silicon nitride ball bearing (preferably deep groove) that is roughly 5 mm to 7 mm in inside diameter. This is to be used in a small model jet engine. I have been looking for hours but can't find anything. Does anyone know where I can get a...

Hi all, I am currently working to build a Joule Heater that will be used to heat samples to upwards of 1000*C in seconds in vacuum. While the temperature and speed is definitely there, the contacts are always non-uniform -- making the data hardly repeatable. I am using a ~70mmx10mm Silicon...

In our experiment we measured the forward resistance of a diode using a multimeter. We used that value and the voltage across the diode to compute the current passing through the diode. Is that value really constant??

Hello Forum, This is my first time on this forum, so, please, forgive me if I've mistaken the right section for the following question. For my research, I need to know the values of LJ pair-potential parameters: the depth of the potential well and the distance at which the latter becomes...

Estimate the Fermi level position EFn for a Si sample at room temperature that is doped with 1015 shallow donors cm-3. From coursework I've gatherred over the year I understand the equation needed is: EF=EC-kT ln(NC/n) n, being equal to the donor concentration EC is the conduction...

Hello, everyone! I was asked by my lab instructor for an Electronic course to conduct a diode experiment by which I can get the value of (nVt) and saturation current (Is) for that diode. I did the experiment by connecting a DC power supply in series with a forward-biased silicon diode...

I noticed that the temperature coefficient of resistivity of pure silicon is a rather high negative number, so just out of curiosity I wanted to see at what temp the resistivity would drop to zero. The formula is ρ-ρ0 = ρ0α(T-T0) where ρ is the final resistivity, ρ0 is the reference...

Well I don't read much into this subject on graphene.But i have read there are obstacles to over come... much like quantum computers which have probably a million times more complicated issues to over. I'm skeptical that a quantum computer will exist in the home for 100+ years... But will...

Hi, I'm trying to find the range of α-particles in silicon; I can work out the stopping power, \frac{dE}{dx}, but the reference I'm using then states that I need to integrate it as follows: R=\int_T^0 (-\frac{dE}{dx} ) ^{-1} dE The thing is, I'm not sure as to how to even start this...

Semiconductors -- role of displaced Silicon or Germanium Revered Members, When we dope a pure Germanium or Silicon with pentavalent impurity or trivalent impurity, the dopant replaces Silicon or Germanium and bonds with neighbouring Si or Ge atom. That is Dopant takes the centre position and...

Hi, i am looking for the SiO2 FTIR peaks. Thanks

What is the state of the art?

Im doing a personal research about robotics applications in space. Can someone tell me what will happen to electronics (radio receiver, PCB, oscillator, integrated circuit board and etc.) when exposed to intense heat or cold in outer space?

Metal nanoparticles (Au, Ag, Al or ...) can coat on porous silicon, the particles can be located inside the pores or on the silicon micro/nano structures. By applying this type of coating is there any change in band structure of porous silicon? As I've measured the band gap has changed.

Okay so I have to work with SVRs in a schematic I'm looking at and I've never seen them before http://img269.imageshack.us/img269/6985/19892699.png Uploaded with ImageShack.us I know how BJTs work but I don't understand how the current is flowing so far I see that a Vin at base...