Semiconductor Definition and 347 Threads

I have a question regarding the absorption of photons in a semiconductor. Assuming I have a doped semiconductor (e.g. nitrogen in titaniumdioxide) removing electrons and creating holes. Do the created holes influence the absorption of photons and therefore have a direct impact on spectroscopic...

Unbelievably complete work (1438 pages!) covering all aspects of p-n junctions, metal-semiconductor contacts, phonon and photon interactions, and the operation of common semiconductor devices from diodes and LEDs to solar cells to transistors and MOSFETs. Hardcover book with flawless dust...

I'm a final year (4th year) applied physics student studying in Ireland, and I've spoken with one of my professors about a possible PhD study. The study he offered me was to do with nanorods and their ability to kill/wave off bacteria, taking inspiration from the Lotus leaf. I've attached what...

So basically, I‘ve always been told that solar cells work because of the PN-junction that exists between two doped materials. Then I‘d like to ask, how do solar cells work that use cuprous oxide - copper electrodes. The cuprous oxide acts as an semiconductor I guess? But It isn‘t doped, and the...

The Wikipedia page on the Hall effect says: I probably don't have the math ability or the time to master solid state physics in all its glory, but I am hoping to get to a heuristic picture of the P-type Hall effect that, at the very least, won't be "not even wrong". My attempt is as follows...

I feel quite confused for a few days, when I apply the bipolar transport equation into a voltage-applied semicondutor material (e.g. p-type c-Si bar, or a resistor) which just have some light-generated electron-hole pairs by a pulse of photon at somewhere on the bar. In terms of bipolar...

Hello, I am simulating the process of NMOS construction. as you know, in order to make the LDD, we need two implantations, one before creating oxide spacer and another after creating oxide spacer. at the last implantation, I am facing an error which is shown in the following image: I put...

This is a confusing subject for me. It's like only getting half of the story. Reading physics but not understanding how it works in chemistry makes it nonsense to me. Imagine we are creating a silicon-based semiconductor. They have covalent bonds between them, with each silicon atom having four...

I'm looking for experimental bandgap information to compare it to DFT calculations from Materials Project and OQMD. Could anyone recommend some?

Hi! How does progress in semiconductor transistors such as Si to SiC or GaN, MOSFET to FinFET, 10nm to 2nm, etc. improves the performance of a controller such as the ABS, ESP, ESC, ... of a car? And how much is the impact of transistor technology progress on such a controller (compared to...

Can you please recommend me some condensed matter physics study books and semi-conductor physics study books? Much Appreciated!

I am thinking about the reason why we cannot probe the built-in potential across a diode with a voltmeter. Obviously, a diode is not an energy source, so it is impossible for it to show a voltage reading. After doing some research, I found some explanations and some questions about them. 1. The...

Hi everyone, I've been studying about semiconductor heterostructures and in particular quantum dots. I was wondering, why is there a need to have a "capping" layer above the layer where the quantum dots are formed within a sample? Thanks in advance!

I have three questions regarding the material Gallium Oxide. I was reading in several articles and they introduced its structure as it has monoclinic structure and it consists tetrahedral and octahedral structures in it. What I can't understand I can connect this structure to the chemical...

Can Silicon and Germanium semiconductors mixture (chemical reaction) with some other chemical elements (if required) assist in creating new and existing robust electronic components? Si + Ge + ? + ? = Can this assist in quantum computing?

What does a MechE/EE/ChemE usually do in this industry? I think that CS/CE works in the software department and architecture. For circuit and stuff, EEs will be working on that. ChemE works on the actual manufacturing of chips. Materials E work in this department too, I think. Am I correct...

I am learning about designing semiconductors but I had some issues understanding some things about the structure of Si. About lattice structure: 1) Why does an FCC has 8 atoms per cell? Doesnt has 14? About wafers 1) I know you can have wafers along different surfaces. What information can I...

I am a new to this and I try to understand the basics. So initially once the atoms of silicon come together to form a solid, due to Pauli law no electrons can exist in the same energy state,thus many energy states are formed which together make the bands. My problem starts at this stage where I...

Hello there, im a physics student from Germany and currently in my second semester of a Bachelor of science. Lately i have become increasingly interested in woking in the Semiconductor Industry and I am currently reading the book "But how do it Know" by J. Clark Scott and i think it is really...

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I had read somewhere that as the temperature increases, its lifetime decreases. But there was no further explanation. Of course, I don't know if it's true yet.

Summary:: What is the advantage of transparent semiconductors such as Fluorine doped tin oxide over main semiconductors? What is the advantage of transparent semiconductors such as Fluorine doped tin oxide (FTO) and Indium tin oxide (ITO) over main semiconductors? Please explain the uses of...

I do not understand why that is the case. Is there any intuitive explanation for it? Thanks

I have a question concerning the differentiation between the zigzag and armchair pattern of graphene. Specifically concerning the fact that zigzag edges produce metallic properties and armchair edges producing semiconducting/metallic properties. How does this relate to the orientation of...

print ('Calculate threshold, power, slope efficiency for different lengths of SC Laser') g = 510 # The gain of the laser, arbitrary value of 510 m^-1 was picked I = np.linspace(0, 0.03,5) #DRIVE CURRENT; 100 values of current, 'I', between 0A and 0.03AV = 1.8 #INPUT VOLTAGE; arbitrary value of...

From the ideal diode model, we can derive the open-circuit voltage (Voc) as: $$ V_{oc} = \frac{nkT}{q} ln(\frac{I_L}{I_0} + 1) $$ where ##I_0## is the dark saturation current and ##I_L## is the light generated current. From the model, if the recombination rate increases, the dark saturation...

Fermi level is known to be constant in a equilibrium state. It is also known to vary according to the number of donors/acceptors. In a nonuniformly doped semiconductor that has varying number of donors/acceptors at different position, how is the fermi level decided? Is it the average number of...

Anyone can help me, which formula I should use for this question?

I still not understand about this, i found so many formulas but I don't know which one i should use for this question

Hey, need a bit of a help. me, an electrical engg. student is confused at this point that my university offers a course(half semester) on "Electronic Devices(ED)" as they call it; as you can infer from the attachment. As I watch the lectures it turns out to be an intermediate course on the...

Suppose you have a non-uniformly doped piece of semiconductor (without an applied bias) such that the acceptor dopant concentration Na(x) decreases from left to right (as x increases). In this case, the equilibrium hole distribution p(x) will not be uniform since then there would be a net drift...

Recently, I have been studying some solid-state physics and I came across this ##E-k## diagram online. Here's an image for reference to what I am referring to...

If so, what will I measure in the Ampermeter, the zero total current or the value of the conduction current? I was thinking of the following example- a circuit consist of a current source, an Ampermeter, a switch, and a semiconductor. The semiconductor can have both conduction and displacement...

Completely lost on this question. Any help would be great, even a direction to start moving would be helpful.

The doped a-Si: H layers in a HIT solar cell do not contribute to the photocurrent. The light they absorb (according to their absorption curve below) is lost. For a doped a-Si: H layer at the front side of the cell that is 25nm thick, what percentage of light at 400nm will be lost due to...

I was recommended to read Physics of Semiconductor Devices by Sze which I was told was the standard textbook for the subject. My background is Electronic Engineering and not physics. After reading the first few pages of the first chapter I am completely overwelmed. I can't make sense of the...

"In the case of negligible paracrystallinity, the density of states (DOS) of the 1D pi-stack depends on the amount of on-site disorder generating a Gaussian tail of states extending into the bandgap (Fig. 3a). Typical pi-stacks of conjugated polymers exhibit moderate amounts of paracrystalline...

Just wanted to check my understanding as well as my attempted answers here: Since light emission at the wavelength of 326.3 nm due to band-to-band recombination is detected, this means that the electron falls down to the valence band to recombine with a hole (to occupy an empty state close to...

Consider the light sensor in a modern camera. Light can give energy to electrons and populate the numerous "boxes" of our light sensor with extra electrons. Those boxes will temporally store the electrons till they are counted. I would like to understand this process with my "Bohmian" glasses...

MOS (p type) 1) Figure a) and b) are the cases of strong inversion. Figure b)-For high frequency signals, electrons at the semiconductor oxide interface do not get enough time to change ( I follow that ), but how come the charge in the bulk close to the depletion region changes with these high...

how you can define the term "Semiconductor Physics" and what is the relation between semiconductor Physics and Material Science?

Assume n type semiconductor: 1) Can the fermi level of metal change when it makes contact with the n type Semiconductor ? What assumptions do we make in ideal situation ? 2) Is the Schottky Barrier in Metal Semiconductor contact remains constant with an applied forward or reverse voltage ? 3) On...

I read about semiconductor laser and its beam shape is conical with 50' of dispersion angle. But for me, it is hard to accept that it is conical because every single drawing I see is rectangular and the plan that laser going out is also a plain, not a hole. And this is the picture I saw...

What subfields semiconductor physics comprise?

Hello, I have two questions into one. First I would like to know what books are considered the best to introduce the theory of quantum dots, so for example with the k.p method, tight-binding, empirical pseudopotentials, and other techniques, analytical derivations, optical properties, band...

Hi, I was studying a book on analysis and design of analog integrated circuits. In the book it is mentioned as "For practical concentration of impurities, the density of majority carriers is approximately equal to the density of impurity atoms in the crystal" I researched about it and I found...

Assume we have a diode closed circuit.We connect the p type region of the diode to the positive terminal of the battery(cathode).We connect the n type region of the diode to the negative terminal of the battery(anode).The voltage of the battery is 0.3V .The diode%s intristic se miconductor is...

Assume we have a closed diode circuit .We connect the n type region of the diode to the positive terminal of the battery.We connect the p type region of the diode to the negative terminal of the battery.The depletion layer is increased.Now we open the circuit.Why the diode returns to its zero...

Homework Statement [/B] I want to find the minimum resistance ##R_L## so as to maintain ##V_z##(voltage of the zener corresponding to the minimum current ##I_{z_0}##) across the same resistor ##R_L##. Homework Equations ##V_z##(voltage of the zener corresponding to the minimum current...

Hi, I'm studying p-i-n photodiode (PD) at the moment and understand that the photodiode's response will depend on the frequency of the light signal going into it. I am struggling however to understand the concept of bandwidth, and why is it that the photocurrent at the PD decreases with higher...