Most generally a class of materials that are neither insulators or conductors in their natural state but which can be manipulated via doping or electric fields to change the conduction state. Silicon, Germanium, GaAs are some usual materials. The term is also used to speak about devices that are ...

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43 views

Using a single inverter to turn a light off

I'm planning on adding two strips of LED lights to the edge of my headlight enclosure. This is obviously an aesthetic "mod" however I'd like it to be semi useful as well. I'd like to be able to wire ...
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0answers
29 views

Diode at reverse biasing

Why the electrons don't move that way : giving that : 1- if the electrons of n type managed to get to p type and electric field will help them circulate again as electrons flow against electric ...
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1answer
74 views

What happened to my second half cycle of my half wave rectifier?

When I'm doing a simple half-wave rectifier with the set-up as shown above (Note: Diode D2 is not connected) and connected terminal 5 and 4 with positive and negative terminal of oscilloscope, this ...
17
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2answers
1k views

Why are silicon wafers used in semiconductor production round?

Wafers used for making semiconductors are round -- but this wastes quite a few chips around the periphery of the wafer in the fabrication process. Wouldn't it make sense to make the wafer as a square ...
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1answer
56 views

BJT Transistor Collector Current

As seen from the question above , I'm required to calculate Ic for both cases. Why am I not able to get the answer by using the formula \$I_C = I_s e^{V_{be}/V_T}\$ ? I was only able to get the ...
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1answer
21 views

Question on uniform semiconductor doping

So my question is shown above. For sample A , I tried to substitute the value of NA into the equation for law of mass action , but I was unable to get the answer. I had to use the equation for ...
3
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3answers
114 views

How do holes conduct current?

I have some questions about holes in a semiconductor. When I checked the net I found holes are said to be equivalent positive charge and they say because the hole moves from one place to another when ...
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1answer
88 views

Why diodes are made up with semiconductor?

I am little bit confuse about 'Why diodes are made of semiconductors'. I know the properties of semiconductor and also know the process of doping but still confuse to get the answer. Why the making of ...
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1answer
29 views

How does cold weather affect the electronics

At Why exactly do chips start malfunctioning once they overheat? Sharptooth asked a very nice question about how does overheat affect electronics. That raised me the question of what does cold ...
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2answers
45 views

Bistable circuts based on non-linear effects (like breakdown)?

Is there any known bistable circuits, which utilize parts in non-conventional mode, so that circuit is somewhat simpler than Bistable Multivibrator? Something like non-destructive breakdown of PN ...
5
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2answers
462 views

Gold coated pads

Is there any difference between a gold coated pad and a gold pad? I have been ordering boards from OSH park, they are really good quality, I'm just wondering what benefits this has over silver or bare ...
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0answers
15 views

What's the current-vs-bias difference between a conductor and a semiconductor with free charge carriers in its conduction band?

What are the electrical differences between a piece of metal and a piece of a (heavily) doped n-Si? How would the difference in charge carrier concentration affect current flow under low-to-breakdown ...
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3answers
50 views

Diffusion process in p-n junction

While studying about Semiconductors I couldn't get why "Negative charge stop electrons from further diffusion and Positive charge stop holes from further diffusion" as stated in (p.6) of the ...
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2answers
89 views

Dark current of photodiode gets higher after heating, why?

I'm doing some experiments using photodiodes. I raised the temperature to about 1000 degree Celsius for 1 second with melting AuSn near the PIN junction. Then the dark current of photodiode is higher ...
1
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1answer
52 views

Finding depletion region without built in potential

I am trying to solve a problem as to find the depletion region's width of a p+-n-n diode. I am given the width of the first n region and the doping of both n regions. Here is the problem: I ...
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0answers
48 views

Cannot find built in potential for this problem

I am doing some homework for my semiconductor physics class but cannot for the life of me find out how to continue... Here is the problem: A p+ n junction is formed in an n-type substrate with ND = ...
3
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5answers
144 views

Why do we need transforms (Fourier, Laplace, Z and wavelet etc.) for a signal to analyse?

Why do we need transforms (Fourier, Laplace, Z and wavelet etc.) for a signal to analyse? Is it necessary for practical calculations and analysis?
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0answers
99 views

Charge carrier concentration - intrinsic and extrinsic semiconductors

We define the charge carrier concentration in intrinsic semiconductors as: $$n^2_i = n_h \times n_e$$ In intrinsic semiconductors we say that these will be equal in number, and hence $$n_i = n_h = ...
2
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2answers
373 views

Making transistors or semiconductors at home

The transistor was invented some 50 65 years ago, so is it not about time to be able to make transistors or other semiconductors at home? Would that be possible?
3
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1answer
84 views

Metal semiconductor contacts

I’m headed back to the CNF (http://www.cnf.cornell.edu/) shortly. It’s a user clean room facility for semiconductor processing. My goal is to make some very simple samples, for use in student teaching ...
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1answer
79 views

Why does it take several seconds of time for the photodiodes to come out of saturation?

I am currently studying about photodiodes and came across this fact that photodiodes take quite a bit of time to come out of the saturation. What really happens during this time (after it is saturated ...
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3answers
136 views

How to remove energy from inductor using semiconductors?

So I have this coil and I'm driving dc current through it. This coil has inductance and thus stores energy from the dc current. I have to remove this energy before I can change the polarity of my ...
1
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1answer
200 views

How to build an H-bridge using MOSFETs? [duplicate]

I want to reverse the polarity of my current source, which is a capacitor in this case, in the middle of discharging phase. Also the capacitor bank is being discharged through a coil to make a short ...
0
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1answer
63 views

What happens on heating an intrinsic semiconductor?

Suppose I have an intrinsic semiconductor and I heat it up on one side. What will be the changes that will occur? As far as I know it won't become an extrinsic semiconductor because that would need to ...
2
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3answers
426 views

Transistors why does increasing base current increase collector current?

I am new to this area so please can you keep your answers simple, thanks. From what I know for an npn transistor in the common-emitter connection the base-emitter junction is in the forward bias and ...
0
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2answers
107 views

Can (CPU) logic and (flash) memory be located on the same die?

Is it possible to manufacture semiconductors in a way that places logic (for example, a CPU core) on the same die with non-volatile flash (or other EEPROM memory) circuits? What about DRAM? It ...
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1answer
183 views

If the depletion layer of a transistor collector/base junction is thick, why are majority carriers still collected?

In "Principles of transistor circuits, 8th edition" (top of p26) it is said that once holes have been injected in the base region by a forward biased base-emitter junction (which I understand) of a ...
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0answers
25 views

Find the Output curve for the given Input Curve

For the circuit given below find the output wave form for the given input wave. The following are the answer choices for the curve of Vout. The answer choice selected in my book is (3) Please ...
0
votes
1answer
35 views

Why is the voltage across a PN junction 0 v when it is in open circuit conditions? [duplicate]

Why is the voltage across a PN junction 0 v when it is in open circuit conditions ?
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votes
1answer
132 views

Cutoff and Conducting diodes

Why is D1 considered cutoff and D2 considered conducting ? Note : I am working with constant voltage model where the diode voltage is 0.7v and I need to figure out I and V. Please explain why D1 is ...
0
votes
3answers
147 views

Instructions on how to build electronic devices [duplicate]

I have got plenty of books in the theory of electronic devices, but I wish to build these transistors (BJT, MOSFETS, etc) and diodes by myself. Which books are there in offer to learn how to do this? ...
1
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1answer
234 views

Why can current flow through the reverse biased base-collector junction (N-P junction) in a BJT with a forward biased base-emitter junction?

If the base-emitter junction of a BJT is forward biased, then current can flow through the reverse biased base-collector junction (N-P junction). This disagrees with my understanding of the PN ...
2
votes
3answers
90 views

reason for degradation of photovoltaics

Photovoltaic panels can have 20 or 25 year underwritten warranties with a guaranteed remaining efficiency of 80 % of the new panel. That means, that photovoltaic panels seem to degrade somehow. Why ...
0
votes
1answer
134 views

Dependence of mobility of charge carriers in semiconductor on the applied electricfield

The mobility in a moderately doped semiconductor depends on the temperature, carrier concentration and the applied electric field. so I want to know: How does mobility vary with electric field while ...
5
votes
1answer
204 views

How is EMI avoided inside of an IC?

I was re-watching this video about how CPUs are made and at the time of the video the link points to, I thought "Isn't there some EMI problems with all those transistor signals flying all over the ...
0
votes
2answers
376 views

How does a Schottky diode work?

There are no spare positive/negative charge carriers on the metal side of the diode, so the spare positive/negative charge carriers on the semiconductor side can not diffuse into the metal and ...
0
votes
2answers
114 views

Relation between drift velocity & conductivity of a doped semiconductor

Here is the problem, and I am stuck. When an electric field with strength \$1 \times 10^3 \text{V/cm}\$ is applied to a p-type uncompensated Si sample at room temperature, the electron drift ...
5
votes
1answer
123 views

How power system is designed for extreme small system, such as google contact lens?

I just read this news and got very curious: http://www.takepart.com/article/2014/07/23/goodbye-finger-pricking-how-googles-smart-contact-lens-really-helps-diabetics Google is designing "Google ...
1
vote
1answer
439 views

Why does Intel produce core i3, core i5 and core i7 processors; but not core i2, core i4 or core i6 processors? [closed]

Why does Intel produce core i3, core i5 and core i7 processors; but not core i2, core i4 or core i6 processors? What is the reason behind this?
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votes
1answer
217 views

What is the meaning of biasing in electrical/electronics circuits? [duplicate]

What is the meaning of biasing in electrical/electronics circuits? What is the need for biasing in BJT/MOSFET? What will happen after biasing when we apply input signal(AC/DC)? Will biasing signal and ...
1
vote
1answer
113 views

What is difference? The name of IC's are punched or printed or stickered on top of it

I've seen in some IC's the name of it is 'printed' on the top side. But in some IC's the names are 'punched',they have impressions on the IC. And in some cases, a 'Sticker or a Label' has been ...
3
votes
2answers
238 views

Why does Intel looks so advanced compared to other foundries, engraving fineness-wise? [closed]

Latest chips from Intel were 22nm, and they are now targeting 14nm (coming in 2014 or 2015 it seems). On the other hand, Global Foundries or TSMC struggle since several years to go beyond the 28nm ...
0
votes
1answer
203 views

Semiconductor diode barrier potential

I have little confusion regarding barrier potential (or built-in voltage) and cut-in voltage of diode. Are these are same or what is the difference between built-in voltage and cut-in voltage in ...
1
vote
1answer
947 views

Where to find derivation of s'' (stability factor for beta) for BJTs?

I'm looking for the derivation of the formula for the stability factor (\$S''\$ or \$S(\beta)\$) of BJT bias circuits, particularly the ones with emitter resistance. The book I'm using says that the ...
1
vote
2answers
489 views

Flyback Diodes and Relays

I'm wanting to use a relay as a SPST switch, and I've noticed many designs incorporate a flyback diode. What instances are these needed and what are potential drawbacks, if any?
2
votes
1answer
374 views

Noticed something weird in derivation of relationship between ICBO and ICEO in BJTs

So I'm currently studying Electronic Devices and Circuit Theory by Boylestad and Nashelsky (11th ed.) and I'm confused as to how the relation between \$I_{CEO}\$ and \$I_{CBO}\$ is derived. So the ...
-1
votes
1answer
102 views

Ideal diodes and applications

simulate this circuit – Schematic created using CircuitLab Question: The input signal V(s) is a square wave of \$\pm\$20V (peak) at 1Hz. Sketch the output waveform V(o). Clearly mark the ...
3
votes
3answers
262 views

Understanding the PN-Junction Built in Voltage

I don't like asking duplicate questions but I couldn't find one that was quite the same. I apologize if it is similar to another. TL;DR: How can a charge neutral substance have a potential? Why ...
1
vote
3answers
68 views

Avalanche breakdown voltage, how does it start?

I would like to learn about the avalanche effect. I understand what goes on in the avalance effect, but I can't understand how it starts. For the avalanche effect to start, an electron (the first) ...
5
votes
3answers
190 views

Given metal dimensions and material, is it possible to determine the maximum current that the structure can handle? [semiconductor processing]

I have a linewidth structure that has very low resistance. I want to know the maximum current that this structure can handle. Since the resistance of the metal is so low, it's hard to measure the ...