Silicon Definition and 199 Threads

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...

Homework Statement Given a silicon beam of diameter 10nm and length 100nm, what would its resistance be if it were doped with a p-type of 10^16/cm^3? Homework Equations R= resistivity*length/area R= length/(qA*electron density* electron mobility) resistivity of silicon= 0.1 ohm*meters...

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...

Homework Statement For the (100), (110), and (111) planes of a Silicon crystal sketch the placement of atoms on the plane and determine the atom density (atoms/cm^2) on the plane. Homework Equations As of now I think the only relavent equation would be the atom density which is...

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...

I am trying to find the Absorbed dose for Silicon cells on a geostationary satellite from a period of (1996 to 2005) The Equation I have is: D(rad) = 1.68e-8 *((1/ρ)*dE/dx) * Phi Where: D is absorbed dose and units are (100 ergs/g or 0.01 J/Kg) (1/ρ)*dE/dx = (MeV*cm^2)/g...

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...

I'm having a play around with a simple radiation detector that has 2 electrodes with a slab of uniformly doped silicon in between. I'd like to know the bias voltage i would need to apply across the electrodes so that the silicon slab is just depleted of electrons (i.e so that positive charge...

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...

What is the different between thin-film PV cell and crystalline silicon PV cell? Are they using the same material but just differ in the fabrication process? Does a multi-junction PV cell belongs to thin-film or crystalline type?

Hi, I had a question that maybe someone might know, and that although I have been researching it I am not finding enough information on the web that would solve the issue. (it's the end of the month, too... and being broke and in a hurry is a problem too...) The project is aimed at...

what will result when 6th group elements are used as dopants to silicon ?

Hi everyone, :smile: I was wondering why they only use 5th and 3rd groups elements to create n-type and p-type semiconductors respectively. Couldn't we mix 6th or 2nd groups' elements instead to make the semiconductors? What would happen if we do this? Perhaps elements of those groups will...

As we know the potential barrier of silicon diode is 0.7V at "Normal Temperature" But if the Temperature is 120 degree Centigrade then what will happen? 1) the Potential Barrier will increase 2) Decrease 3) Remain Same Please Explain also!

Given the semi-empirical mass formula for the binding energy of a nucleus is B(Z,A)=a1A-a2A2/3-a3Z2/A1/3-a4(Z-N)2/A+delta(Z,A) calculate the energy released in the reaction 28Si +4He --> 32S + gamma. Hence find how long silicon burning will sustain a massive star which has 1Mo of silicon in...

Here's an interesting article about molybdenite having superior semiconductor properties in comparison to silicon: http://www.eurekalert.org/pub_releases/2011-01/epfd-nta012811.php What's the verdict? Is this stuff the better material? Could be it a viable successor for future applications?

Hi, basically i am confused about the characteristricts of silicon diodes and waffers. As i know the VI @ CV characterstricts of the diode. But i tested the same characterstricts with silicon waffers which behaves perfectly same as like diodes. Mainly i need to know about the difference between...

Hi, basically i am confused about the characteristricts of silicon diodes and waffers. As i know the VI @ CV characterstricts of the diode. But i tested the same characterstricts with silicon waffers which behaves perfectly same as like diodes. Mainly i need to know about the difference between...

Homework Statement A silicon wafer that is 200 um thick has no front reflection, 30% back reflection and absorption coefficient \alpha=39.9 cm^{-1}. What is the flux absorbed? Homework Equations Beer's absoorption law: \Phi(x) = \Phi_0 e^{-\alpha x} The Attempt at a Solution...

Question: Among six measurement of the boiling point of a silicon compound, the size of the error was 0.07,0.03,0.14,0.08 and 0.03 degree Celsius. Assuming that these data can be looked upon as a random sample from the population given by f(x;\theta) = 2(\theta-x)/\theta for 0<x<\theta =0...

1. A Silicon wafer is doped with 2*10^16 cm^-3 Boron and 10^16 cm^-3 Phosphorous atoms. Calculate the electron and hole concentrations, the Fermi-level and the resistivity at room temperature I have no idea how to work out the first part of this question as my lecture notes are lacking in...

Hello. I am interested in making homemade LEDs in the manner described here: http://www.popsci.com/diy/article/2010-02/gray-matter-light-mystery Could this work with silicon carbide sandpaper instead of the crystal form? If so, would I want to go for a lower grit to improve the chances of...

Homework Statement This is part of a much larger problem, but I'm stuck on trying to draw an energy band diagram for doped silicon and I'm wondering if it is possible for me to find the energy levels ( E_c, E_v, E_f, and E_i ) in a doped semiconductor knowing only the concentrations? This...

When the electrons in silicon are excited by visible light and jump into the conduction band how do the electrons replace? So for example, wouldn't a solar cell only last for so long if all the valence electrons are excited and converted into current. I am looking at it as if all the valence...

Homework Statement The dc reistance of a silicon diode for a current of 10 mA is closest to: Homework Equations Really not sure. The Attempt at a Solution Not sure where to start, this goes with a lab I just completed but not sure if this problem directly correlates to it.

Hello, I have been doing some research with self assembled monolayers. I was wondering if a molecule terminating in -OH was able to bond with a silicon wafer in atmospheric conditions?

Homework Statement A sample of silicon is purified until it contains only 10^22 donors per cm^3 . Below what temparature will it cease to show intrinsic behaviour? ( take E_g = 1eV ; E_d = 0.05eV ; m_e =m_h = 0.2 Homework Equations for intrinsic semiconductors: n_{i}^{2} =...

Anyone has backgroud on silicon material or VLSI engineering please sound off, I will pm you or please pm me advance. Thanks in advance.

whenever a impurity is added to the semicondutor i.e. silicon or Ge ,why the impurity is chosen from group 13 and 15?why not from group 17 or 12 from periodic table?

So I'm doing research with MEMs so we're going to be making silicon wafers that will have little cantilever beams on them which will act as an accelerometer. I need to design it so the beams break at certain forces but to do that I need the yield strength of silicon (that is the correct...

Researchers have developed silicene, atom-thick silicon sheets similar to graphene: http://www.knoxnews.com/news/2010/aug/25/silicene-new-form-silicon-might-speed-microcircuit/ http://apl.aip.org/resource/1/applab/v96/i26/p261905_s1?isAuthorized=no How similar could atom-thick...

Homework Statement Where can i study about those projects in which silicon and germanium use as a diode with their purpose in the appropriate project? The Attempt at a Solution I want the list of atleast 30 projects in which si & ge , i also wants to know for which purpose si & ge use in...

Can anyone tell me. In which electronics projects we use Si and Ge diodes and for what purpose do we use it ? I want the list of 18 projects in which we use Si and Ge diodes with their purposes in each project. Where can i get this information ?

Hai.. I have a problem with my heat transfer coefficient estimation during my evaporation measurements. Here is the problem: Two scenarios are compared. Case 1: I have a well defined rectangular area in a silicon wafer. Water is completely spread over it. The mass of water is known. Air is...

The theoretical maximum efficiency of silicon solar cells is about 29%. How is this theoretical maximum efficiency derived? How can I use the working principles of a silicon solar cell to explain this?

I've tried to look this up online, but I can't find it anywhere. I'm just looking for the intrinsic fermi energy of silicon E_i ? Can someone maybe direct me towards a website where I could look it up? Either that, or is there a way to calculate it from the energy gap for intrinsic silicon...

Can some1 please assist me with this question,i have tried every means possible with no avail. 1, A wafer of intrinsic silicon is deliberately doped with 3 X 10^20/m^-3 of acceptor atoms 1, CAlculate the electron and hole concntration in the wafer 2,calc the position of the Fermi level in...

I have some questions about how silicon diode works, specifically as a ionizing radiation measurement instrument. I will write what my understanding is so far from different textbooks/websites (please comment whether I have it correct) and also write question where I get confused. Thank you...

Hello, I'm studying for a project a rectangular-cross sectionned suspended silicon nanowire. My question is very simple: at which current will my nanowire break? The melting point is 1687K and I start at 300K I don't really know where to start since the resistance, the thermal...

Homework Statement There are 8 atoms in a unit cell of Si. Silicon has an atomic weight of 28.09 and a lattice constant equal to 5.43 A. Determine the density of silicon/ Homework Equations ? The Attempt at a Solution ?

I am not asking how to make this reaction. Please do not lock this thread just because it happens to contain the word "thermite". I am simply asking for information about this process for research involving silica. The Goldshmidt process between silicon dioxide and aluminum is expressed by...

Why don't silicon diodes emit light? Attempt: No idea. However, I do know that gallium arsenide is used as a semiconductor in LEDs.

To my knowledge (which is often poor), silicon chips will hit their limit by 2020. What technology will replace silicon? graphene optical or quantum computing What else is out there? What are your opinions?

Which Industry Will Be Next Big Thing Just Like Silicon Valley Boom In 90's? i mean industry that will provide huge wealthy oppurtunities just like silicon valley boom in 90's.could it be renewable energy,genetic engineering,materials engineering,nanotechnology,space construction or anything...