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Semi-conductors
| Question | Answer |
|---|---|
| What is a semi conductor? | A substance whose resistivity is between that of a conductor and an insulator and whose resisitivity decreases as its temperature increases |
| What are conduction electrons? | Valence electrons with enough thermal energy to break its covalent bonds |
| At what temperature is silicon an insulator? | Near zero kelvin |
| What are holes? | The gap left when an electron breaks free of a covalent bond |
| What is intrinsic conduction? | Conduction in a pure semi conductor due to electrons moving from negative to positive with an equal number of holes moving in the opposite direction |
| What is a thermistor? | A semi conductor whose resistance decreases rapidly with increasing temperature |
| What is a light dependent resistor? | A semi conductor whose conductivity is increased when light shines on it |
| What is doping? | Adding small controlled amounts of impurities to a pure semi conductor to increase its conductivity |
| What is an N-TYPE semi conductor? | An N-TYPE semi conductor is a conductor with an impurity added which increases the number of electrons available for conduction |
| Name an example of an N-TYPE semi conductor | Silicon and phosphorous |
| What is a P-TYPE semi conductor? | A P-TYPE semi conductor is a conductor with an impurity added which increases the number of holes available for conduction |
| Name an example of a P-TYPE semi conductor | Silicon and Boron |
| What is extrinsic conduction? | Increased conduction in a semi conductor due to the addition of impurities |
| What is a P-N junction? | A semi conductor with one end doped P-TYPE and the other doped N-TYPE |
| What is a depletion layer? | A depletion layer is a region in a P-N junction diode where no mobile charge carriers are present which behaves as an insulator |
| What is junction voltage? | The potential difference across a P-N junction caused by holes and electrons moving across the junction when its formed |
| What is a forward biased P-N junction? | One that conducts current. With the positive terminal connected to the P-TYPE |
| What is a reverse biased P-N junction? | One that doesn't conduct current with the negative terminal connected to the P-TYPE |
| Why is current in a forward biased P-N junction very small at a low voltage? | It must first exceed the junction voltage |
| Name to uses of P-N junctions | Rectification of A.C Integrated circuits |
Created by:
JackEatonK98
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