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Cree Interview Questions

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Can Si be used to make LEDs ?

3 Answers

Si can be used as a substrate in LEDs, but it cannot be used in the p-n junction because the bandgap energy is too small to produce visible light.

Technically: Yes. But it has an indirect bandgap, so you really wouldn't want to.

The energy bandgap of Si at room temperature is 1.12eV. Since the relationship between photon energy and wavelength is E(eV)=1.24/wavelength(micrometers), one can calculate that Si could emit a ligth in infrared optical spectrum: wavelength=1.24/1.12eV=1.11 micrometers. BUT, Si is indirect semiconductor! And therefore does not emit significant amounts of light due to the requirement of momentum conservation in optical transitions.

If you're stuck in the middle of nowhere with a broken down car, how can you determine what the problem is?

3 Answers

If an ice cube melts in water, does the water level rise or fall? Explain with details.

3 Answers

Estimate the number of flat tyres in the US in a year?

3 Answers

If a glass of water is half full and you put ice in it, when ice melts, the water level will increase of decrease or remain constant? Give scientific reason.

2 Answers

How many barbers to cut men's hair in a city of 2 million people?

2 Answers

Difference between turbo and cryo vacuum pump?

2 Answers

One of the interviewers took a bag of screws out of his pocket and asked me some questions about certain ones like, "what kind of material can this be used for, put these in order according to cost, etc."

1 Answer

What is an LED?

1 Answer

If I have two sons whose ages when added together is 20 and when subtracted is 1, what are their ages?

1 Answer
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