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Process Development Interview Questions

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Can Si be used to make LEDs ?

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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.

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

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

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

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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.

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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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why does other semiconductors can be used for LED/

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Are you willing to work on weekends

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Behavorial and personality questions. (I.e. what was most challenging about this project, tell me about how you learned about...)

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How does a LED work?

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