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Process Developer 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.

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?

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The panel interview make it very difficult to concentrate. Several ppl attacked the candidates at once. They ask a lot of technical question on how you overcome difficult projects that you encountered. They dont offer water, breaks or comfortable conference room

2 Answers

Name different ways proteins can be separated, besides what your experience shows.

1 Answer

Do you favor working as a member of a team or on your own?

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What would be the time mix that I would prefer , Computer / Document , vs out in the plant .

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What is an LED?

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

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