Semiconductor Definition and 400 Threads

Semiconductor dioedes ! when proving that the ideal diode is short circuit in forward biasing we calculate the diode Resistance Rf which is equal to the diode forward voltage upon it's forward current ...but why we put VD=0 why?

Right, so I'm a freshman in college right now, so if I'm wrong, I'm wrong. Would it be possible to get a biological system to imitate or act like a semiconductor or nanoelectronic device or is that a fantasy? Does anyone here have experience doing it? Or perhaps use nanoelectronics to solve...

Hello. "Hypothetically" let's say that I have a material that intrinsically behaves like a highly degenerate p-type direct gap semiconductor (significant p-orbital contribution to the DOS at and above the fermi level). Can anyone think of what in the world such a material may be useful for...

In a semiconductor @ 0k highest energy state lie on fermilevel(all electrons @ valence band). but @ room temperature highest energy state of covelence band lie below the fermilevel. how can i understand this? pls help me.

Homework Statement a) Sketch a schematic band structure diagram for a p-type semiconductor. Mark the energy of the top of the valence band, the bottom of the conduction band and the impurity level on the diagram. b) Sketch the ln (σ) versus 1/T curve for a p-type semiconductor, where σ is...

THE TEMPERATURE DEPENDENCE OF THE ENERGY GAPS IN SEMICONDUCTORS Where I can find text about this topic and models that describe this? I know about Linear and Varshni models, and what about two (or more) other models?

i have a general question that I need to know to apply for jobs. What do we mean by "semiconductor industry"? and where is most of the semiconductor industry located? I know Silicon valley but according to my survery most of the industry there is like google, youtube, facebook etc.

I've been having a very difficult time understanding why band structure is expressed in terms of momentum/crystalline directions. I've included a picture of the band structure of silicon so that you can better understand my question. I think I understand basic crystalline structures and the...

I'm extremely interested in semiconductor devices (MOSFETs, BJTs, diodes, etc) and I plan on pursuing a career in this field. However, what I am contemplating is whether or not it would be beneficial to pursue a masters before attempting to get into the semiconductor industry, or if a BE is...

Are the electrons in the donor and recipient energy bands in doped material involved in conduction of electricity, and why?

Why does the LED structure "favorizes" p-type semiconductor? Hi all, At first I apologize if my English makes this post harder to understand ;). I am trying to figure out why there is always P-type semiconductor flashing outside in LEDs, both planar and edge ones - P-type region is the active...

I have few queries regarding the below Qs. 1. How does the fermi level vary with distance under both equilibrium and non-equilibrium conditions? Is it constant or varying under equilibrium and non-equilibrium conditions? My query>> Fermi level vary with temp. But I am not getting how to...

Homework Statement To plot the bandstructure of a free electron in silicon using python. Homework Equations We have been told that to do this we must use the 15 lowest magnitude reciprocal lattice vectors (so 2pi/A (0,0,0), (1,1,1), (-1,1,1) etc...). We are then told to setup a matrix with...

Hi all, this is my first post here. I'm hoping some input will help me verify what I am missing. This is a question from an exam paper I'm doing for a module on introduction to semiconductor technology Calculate the CMOS inverter output voltage Vout, and the corresponding inverter current...

Will a current through the ptype + metal material be very low because of the ptype material? Does a junction like a pn junction form between the ptype semiconductor and the metal? Thanks for your time.

Hello All; This is a question I found in semiconductors and devices by Kanaan Kano. Basically, the volume of a bar of Silicon is given at 300 K [1x0.01x0.2 cm]. How would you find the resistance of the bar if it is intrinsic. Also, what will be the new resistance after doping of 10^15...

I read an article a week or so ago talking about using a semiconductor to disrupt a magnetic field. Generally a magnetic field can be disrupted by any magnetic material in its path. Steel for a basic example can reduce the realized field on the opposite side from the magnetic field source...

Homework Statement A semiconductor diode is made of acceptor and donor dotted regions. In equilibrilum there is a volume charge region at about x = 0. In that region there is no free charge carriers, only single charged. In x<-dp and x > dn, there is no charge at all. The surface area of the...

Or is 'semiconductor' more specific, referring to only some transition metals? After looking up the etymology*, I guess that a hypothetical material besides the transition elements which had properties which met the definition of 'semiconductor' would qualify; but that doesn't completely...

Many of you may be annoyed by my question. I'm sorry in advance. I've just finished my M.S. in Materials Science & Engineering, and have gotten an offer as a Semiconductor Process Engineer. The specialty is lithography and wet chemistry - including wet etching. As an MSE student I learned...

Greetings, Could anyone help to tell me how to estimate the dielectric constant of cobalt oxide? Cause I have looked for the database, and couldn't find the data. Very thanks, jovis

Greetings everyone. A little about my situation: I'm a 3rd year student studying in New Zealand, specialising in a 4-year undergrade program on optoelectronics, basically a mixture of computer systems engineering, electrical engineering, physics papers on optics and electronics. On my...

We know that the built in potential barrier Vb does not allow any net current in a semiconductor. Now when we connect a battery in forward biased with the voltage V the current begins to flow even if V<Vb. Agreed. But my text says that V cannot exceed Vb is this true? for reference...

When we provide thermally or optically en energy higher than the semiconductor bandgap we create elctron-hole pairs, that is electrons are extracted to the valance band and they become free to move inside the crystal. My question is: are the semiconductor atoms then ionized, which means for...

Hiya, been given this question which I am having problems with. Semi conductor quantum well structure contains a 100A thick layer of GaAs between thick AlGaAs layers. Find the band gap for the structure, where GaAs has the following parameters; conduction band effective mass 0.067 me, heavy...

Hi, I am from an engineering background and I am in the process of learning about semiconductor physics to get a more generalized picture on the operation of the devices rather than just the operating characteristics. To start with I am studying about the p-type and n-type semiconductors...

Hi just a quick question, does the type of impurity (as long as its from group 3 or 5 respectively) used in doping a semiconductor matter in terms of its activation voltage or is it just down to the level of doping? So for instance a would say a silicon semiconductor doped with 1 to 10,000...

Hi all, I'm a math major about to take the plunge into EE in hopes to work in the semiconductor industry (hopefully working on CPUs, GPUs, etc.). I have math degree, so mathematically challenging aspects of things don't scare me too much. However, I have a question about how working in the...

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...

Hey guys, since this seems to be the brainiest place on the web for physics and engineering topics, I was wondering if you guys can help me out. I have to do a short encyclopedia page for my semi-conductor class about sensor applications. Now, after doing a little bit of research, I thought...

Hi, I have a question regarding Energy band. The energy band of a simple cubic semiconductor crystal with a lattice constant b can be represented as in the following function: E(k) = E0 + E1[cos(kxb) + cos(kyb) +cos(kzb)] where E0 and E1 are independent of the wave vector k. i)...

what is the difference between a commercial grade IC and an Industrial grade IC. Industrial works at a wider temperature range. I am not asking about that. What is it that you change inside the chip that makes it work at higher temperature ranges?

for the semiconductor which doping both donor and acceptor impurities... for example,determine the hole and electron density thermal equlibrium densities and the location of fermi level with respect to Ec,for a silicon at 300K that is doped with 3x10^6 boron and 2.9x 10^6 phospohorus...the...

I have been told that the relationship n.p = (n_i)^2 always holds, where n_i is the intrinsic carrier concentration. This makes sense to me for an un doped semiconductor (sc.). However, for a doped sc., I'm a tad confused. For an n-doped material say, the electron conc. is...

Here's the problem: A GaAs quantum well of thickness 10 nm is held in a cryostat at a low temperature and is excited with a powerful ultrashort laser pulse at time t = 0. The laser pulse injects 1 × 1015 m−2 electrons and holes per unit area of the quantum well into the conduction and valence...

I just finished reading Absolutely Small, a book on quantum physics. In it the author says that when semiconductors get very cold the electrons no longer have enough energy to jump the band gap, and therefor they do not work. I have also watched a video of a guy who poured liquid nitrogen...

Over the past 3 months I've been watching Leonard Susskind's lectures (Stanford) on quantum mechanics and particle physics from YouTube. This has been an enjoyable experience and I would like to further my own education. My interest is in semiconductor physics particularly modelling using the...

what is planar technology?

Homework Statement Suppose an unknown semiconductor material has bandgap energy of .1 eV. Density of states for conduction and valence bands are both = 10^18cm^-3. If the material is doped with shallow donors (n-type) Nd=10^17cm^-3, what is electron and hole concentrations? Homework...

Hello, I have the problem, from Sze' book, tunneling current, what is m*? I want to konw the value of it. The m* has many reference, how do I select? My interested device is diode that was doped with Boron and Phosphorus for p-n junction. Thank very much.

This seems like a straightforward thing but no textbook I've seen addresses it. Take the direct gap semiconductors GaAs (band gap 1.42 eV) and InAs (band gap 0.42 eV). If these two were alloyed together, would the band gap become some sort of average between the two values? As an example, say...

Hi There, Im doing a study of MOS capacitors (Semiconductor is 4H-SiC) and I am looking at the interface trap density with respect to temperature (range 300K to around 600K) and also photonic excitation with hv<Eg. That said, i have a question regarding the temperature dependence on...

whats the difference between ordinary semiconductor and degenerative semiconductor?

What exactly is a process corner. Is it actually the corner on the silicon wafer? Why does speed vary in process corners? Is the doping not uniform?

Homework Statement There are 4 questions in the assignment. None of them need calculation. The questions is as attached below. Homework Equations None. The Attempt at a Solution 1. I think the "photoconductivity" is a typo, should be replaced with "photoconductor". From Wiki, I...

Homework Statement Consider a hypothetical semiconductor with band gap 1eV, Relative electron mass is 0.05 and relative hole mass is 0.5. In a cube-shaped quantum dot of this material with side length L = 3nm, what is the energy associated with a transition from (2 1 1) electron state to...

indirect band gap semiconductor doubt its said that indirect band gap semiconductors like silicon and germanium are not used as a light sources because they have more non-radiative recombinations rather than radiative ,which inturn decreases efficiency of optical source. but i want to...

Homework Statement You use the solid diffusion source wafers PH-950 from St. Gobain (see data sheet on TSquare, Diffusion Chapter) to form phosphorous-doped resistors in a p-type wafer with a background doping concentration of 1015 cm-3. According to the data sheet, a 60-min predeposition at...

is mass action law only applicable to semiconductor at thermal euilibrium and why? i don't know what happens with semicounductor at thermal euilibrium...why is mass action law not applicable at non-euilibrium...

Homework Statement A Czochralski growth process is begun by inserting 1000 moles of pure silicon and 0.01 mole of pure arsenic in a crucible. For this boule, the maximum permissible doping concentration is 1018 cm-3. What fraction (X) of the boule is usable? (k=0.3) Homework Equations...