Home
Class 12
PHYSICS
statement1:To make p type semiconductor ...

statement1:To make p type semiconductor , pentavalent impurity like phosphorus is mixed with Si.
statement2: Pentavalent impurity produces free electrons.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements about semiconductors, let's break down the information step by step. ### Step 1: Understanding P-Type and N-Type Semiconductors - A **p-type semiconductor** is formed by doping a semiconductor material (like silicon) with a **trivalent impurity** (like boron), which has three valence electrons. This creates "holes" or positive charge carriers. - An **n-type semiconductor** is formed by doping with a **pentavalent impurity** (like phosphorus), which has five valence electrons. This results in extra electrons that act as negative charge carriers. ### Step 2: Evaluating Statement 1 - **Statement 1**: "To make p-type semiconductor, pentavalent impurity like phosphorus is mixed with Si." - This statement is **incorrect** because phosphorus is a pentavalent impurity that creates an n-type semiconductor, not a p-type semiconductor. P-type semiconductors require trivalent impurities. ### Step 3: Evaluating Statement 2 - **Statement 2**: "Pentavalent impurity produces free electrons." - This statement is **correct** because when a pentavalent impurity like phosphorus is added to silicon, it contributes one extra electron per atom, which becomes a free electron in the conduction band. ### Conclusion - **Statement 1** is false. - **Statement 2** is true. ### Final Answer The correct option is that **Statement 1 is false and Statement 2 is true**. ---
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section -C(Linked comprehension type question))|3 Videos

  • SEMICONDUCTOR ELECTRONICS (MATERIAL, DEVICES AND SIMPLE CIRUITS )

    AAKASH INSTITUTE ENGLISH|Exercise Assignment SECTION - D (Assertion & reason type Question)|10 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|63 Videos

Similar Questions

Explore conceptually related problems

Statement-1:p-type semiconductor are good conductor of electricity due to metal excess defect. Statement-2: F-centres are created due to metal excess defect.

For a p-type semiconductor, which of the following statements is true?

The impurity atoms needed to make a p-type semiconductor are

A: When a pure semiconductor is doped with a pentavalent impurity, the number of conduction electrons is increased while the number of holes is decreased R: Some of the holes get recombined with the conduction electrons as the concentration of the conduction electrons is increased.

which of the following statements are true about semiconductor ? (a)silicon doped with electron rich impurity is a p-type semiconductor (b)Silicon doped with an electrons rich impurity is an n-type semiconductor (c)Delocalised electrons increase the conductivity of doped silicon (d)An electron vacancy increase the conductivity of n- type semiconductor

To get n -type doped semiconductor, impurity to be added to silicon should have the following number of valence electrons

To get n -type doped semiconductor, impurity to be added to silicon should have the following number of valence electrons

If we mix a pentavalent impurity in the crystal lattice of germinium the type of semiconductor formed will be:

Germanium has been doped with impurity as shown in I, II, III and IV and based as it statements A. n-type semiconductor is formed in I and III B. p-type semiconductor is formed in II and IV C. P-type semiconductor is formed in II and IV D. p-type semiconductor is formed in I and III Select the correct statement(s).

Which of the statements given in above example is true for p - type semiconductors ?

Home
Profile