Silicon Definition and 177 Threads

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!

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...

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...

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?

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 ?

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...

Research-related question: What is the typical on/off ratio of a silicon transistor? This seems like basic information, but I can't find it anywhere. Also, how high does the on/off ration need to be in order for transistors (say, in a logic circuit) to function correctly? Thanks!

Is Silicon chemistry very similar to Carbon chemistry? Being in the same column with the same number of valence electrons, I assume it would be? Would I be able to use the same mechanisms I learned in my Organic Chemistry class? I ask because I'm trying to synthesize PEG-trimethoxysilane...

hi everyone... i have got a general doubt...I have heard that silicon is transparent to infrared...so does that mean that any IR wave entering silicon comes out of it without any change? Is silicon 100% transparent to IR? does the transparency depend on temperature or any other parametre...

Homework Statement I have to find the value of the Fill Factor of the silicon photocell. I graph for current, voltage and power. I got this as a value 1.6x10-2 Is this the correct answer ? I just need the real value so I can compare it with my results .. Homework Equations Pmax/Po The...

Why is the Earth made up of so much silicon?

Hey there. I have a question concerning the effective masses in silicon. From what I've learned, the effective masses of electrons and holes can be determined from the curvature of the dispersion curve at the extrema. Since the effective mass is inversely proportional to the second derivative...

what lead to the discovery of silicon & how is it extracted commercially & how can it be done at home aswell?

Hi all. A little while ago I overheard my cousin chatting with a friend who works in the semicon industry about the binning process. He was specifically talking about MPU binning techniques in use nowadays and I overheard him mention something to the sound of "boutique line binning". :confused...

I 'trying to find the thermal conductivity of a silicon substrate doped with boron with known dopant concentration. Is there any way to calculate it or it has to be measured. Thanks in advance for any advice.

Homework Statement I need to find the temperature coefficient of resistivity \alpha for silicon at the temperature of T=300 Kelvin. I am supposed to assume that \tau, the mean time between collisions of charge carriers, is independent of temperature. Homework Equations Temperature...

Hi This semester my group and I are calculating the band structure of silicone (bulk and nano crystals). In bulk silicon a indirect band gap occurs, where the highest occupied valence band and the lowest unoccupied conduction band are situated at different k-values. Does anyone know why...

When considering a vibrating silicon atom. I'm just not sure how to do the conversion o.O

I've looked everywhere. Can someone tell me if there is a half cell potential for silicon? Si(0) ---> Si(4+) + 4e Every list of the galvanic series on the web that I have seen has no data for silicon.

Does anyone know what the output is like from beta-voltalics? And how much radiation is needed and how much silicon? Thank you in advance.

Interesting article I read on how the highly-conductive graphene also begins to exhibit some semiconductive properties at very narrow dimensions: http://www.technologyreview.com/Nanotech/20119/ http://physicsworld.com/cws/article/news/32539 Gee, I wonder if this could keep Moore's Law going?

What is Silicon Valley really like? Obviously, many big name tech companies are there, but what's the atmosphere like? Is it like any other city (but more expensive)? Are there tons of opportunities there? If I were to move there and work full time as an EE, would I also be able to...

As I'm interested in the simplifications of property tensors due to crystal symmetry, I have been trying to find the symmetries of silicon (i.e. the diamond structure). As silicon belongs to the m3m point group I would e.g. expect to find a mirror plane perpendicular to the [100], [010] and...

Homework Statement A silicon sample is doped with 5.0 X 10^19 donor atoms/cm^3 and 5.0 X 10^19 acceptor atmos/cm^3 a)What is its resistivity? b)Is this an insulator, conductor or semiconductor? c)Is this intrinsic material? Homework Equations No clue.. this is where I need help The...

Homework Statement I am just starting an essay on this topic and gathering info from different sources, this is the best source of info i have came across! Homework Equations Do you think it likely that life elsewhere could be silicon based? What are the similarities and...

Hello, can any tell website where i can find Permittivity,Permeability and conductivity(or resistivity) of silicon, silicon nitride and aluminum.thanks and also if anyone has worked in ELECTROMAGNETIC module of Intellisite (version 8.1)for RF MEMS Switches please do tell me i need some guide line.