Bissoy.com
Doctors Medicines MCQs Q&A

When an impurity is doped into an intrinsic semiconductor, the conductivity of the semi-conductor

When an impurity is doped into an intrinsic semiconductor, the conductivity of the semi-conductor Correct Answer Increase

In semiconductors, the process of diffusing an impurity is called doping. The conduction properties are very sensitive to the amount of impurities For eg. When a phosphorous atom with five outer electrons is substituted for a silicon atom, an extra electron is made available for conduction. Thus, the number of conduction electrons increases due to the introduction of a penta-valent impurity in silicon. The introduction of phosphorus in the proportion of 1 in 106 increases the conductivity by a factor of about 106. So, the desired properties of semiconductor can be obtained by controlling the amount and distribution of impurity.

Related Questions

Which of the following components is used to create an N-type semiconductor? a. Trivalent impurity b. Pentavalent impurity c. Intrinsic semiconductor d. Extrinsic semiconductor
1. The pin diode consists of two narrow, but highly doped, semiconductor regions separated by a thicker, lightly doped material called the intrinsic region. 2. Silicon is used most often for its power-handling capability and because it provides a highly resistive intrinsic region. 3. The pin diode acts as an ordinary diode at frequencies above 100 MHz. Which of the above statements are correct?
Each of the questions below consists of a question and three statements number I, II and III given below it. You have to decide whether the data provided in the statement are sufficient to answer the question. Find the percentage of impurity in the mixture. I. A discount vendor professes to sell his at the cost price and mixes with impurity and thereby gain 25%. II. If in 45 kg of mixture, 5/2 times quantity of impurity is equal to 150% of 2/3 of the quantity of whole mixture. III. The ratio of quantity of pure wheat in the mixture to the total quantity of the mixture in 3 : 5. (Mixture is made of pure wheat and impurity)
What type of material is obtained when an intrinsic semiconductor is doped with pentavalent impurity?
What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?
Consider the following statements with regard to semiconductors: 1. In n-type material free electron concentration is nearly equal to the density of donor atoms. 2. 1 part in 108  donor type impurity added to Ge improves its conductivity at 30°C by a factor of 12. 3. Phosphorus is an example of n-type impurity. 4. Conductivity of Si is more sensitive to temperature than Ge. Which of these statements are correct?
A p-type semiconductor material is doped with ____________ impurities whereas a n-type semiconductor material is doped with __________ impurities
Silicon is doped with arsenic (concentration 1020 atoms.m-3). At room temperature, the electron and hole mobilities in Si are 0.14 m2.v-1.s-1 and 0.05 m2v-1.s-1 respectively. The conductivity in (?m)-1, at room temperature for Si doped with As is
Consider the following statements about thermal conductivity: 1) Thermal conductivity decreases with increasing molecular weight 2) Thermal conductivity of non-metallic liquids generally decreases with increasing temperature 3) Thermal conductivity of gases and liquids is generally smaller than that of solids Which of the above statements are correct?
P-type extrinsic semiconductor doped with impurity having how much valence electron?