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Silicon that has been doped with gro...

Silicon that has been doped with group - 15 elements is called :

A

`p`- type semicondouctor

B

n-type semiconductor

C

electron vancany or hole

D

None of these

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To solve the question "Silicon that has been doped with group - 15 elements is called:", we can follow these steps: ### Step 1: Understand Doping Doping refers to the process of adding a small amount of impurity to a pure semiconductor material to modify its electrical properties. **Hint:** Remember that doping changes the conductivity of the material by introducing charge carriers. ### Step 2: Identify the Group of Silicon Silicon (Si) is a group 14 element and has 4 valence electrons. These electrons are used to form covalent bonds with other silicon atoms in a crystal lattice. **Hint:** Recall the periodic table and the number of valence electrons for group 14 elements. ### Step 3: Identify Group 15 Elements Group 15 elements include phosphorus (P), arsenic (As), and bismuth (Bi), which have 5 valence electrons. **Hint:** Group 15 elements are also known as pnictogens. ### Step 4: Analyze the Doping Process When silicon is doped with a group 15 element, the dopant contributes one extra electron (5th electron). Four of these electrons are used for bonding with silicon atoms, while the remaining one becomes delocalized. **Hint:** Focus on how the extra electron affects the bonding and conductivity of silicon. ### Step 5: Determine the Type of Semiconductor The delocalized electron from the group 15 element contributes to electrical conduction. Since these extra electrons are negatively charged, the doped silicon is classified as an n-type semiconductor. **Hint:** N-type semiconductors are characterized by the presence of free electrons as charge carriers. ### Conclusion Silicon that has been doped with group 15 elements is called an **n-type semiconductor**. **Final Answer:** n-type semiconductor
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Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. No. of valene electrons in silicon are :

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Silicon dopped with group 13 and group 15 member element is, repectively, called …… semiconductor