Determining N-Type and P-Type Semiconductor Characteristics

In summary, the conversation discusses determining the type of doping in a semiconductor and finding the location of the fermi level with respect to Ec. The speaker asks if the semiconductor is N or P type and is advised to calculate the electron and hole concentration to determine this. They then inquire about the equation for finding the location of the fermi level, which involves using the concentration of donor impurities and the intrinsic concentration.
  • #1
xw0927
7
0
for the semiconductor which doping both donor and acceptor impurities...
for example,determine the hole and electron density thermal equlibrium densities and the location of fermi level with respect to Ec,for a silicon at 300K that is doped with 3x10^6 boron and 2.9x 10^6 phospohorus...the question i asked is this doping semiconductor is N or P type semiconductor?isn"t we need determine its is N and P type semiconductor first?
 
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  • #2
No, you find out if it's primarily n or p-type by calculating the electron and hole concentration.
 
  • #3
ooo..okay,thanks ya^^...then about finding the location of the fermi level with respect to Ec,after we had determine it is N type semiconnductor,then we use the equation of Ef-Ei=kt ln N(donor) / N(intrinsic)?
 

FAQ: Determining N-Type and P-Type Semiconductor Characteristics

1. What is the difference between N-type and P-type semiconductors?

N-type semiconductors have an excess of free electrons, making them negatively charged. P-type semiconductors have a deficiency of electrons, making them positively charged.

2. How do you determine the type of a semiconductor?

The type of a semiconductor can be determined by measuring its Hall voltage, which is a result of the magnetic field created by the free electrons or holes in the material.

3. What is the Hall effect and how does it relate to determining semiconductor type?

The Hall effect is the creation of a voltage across an electrical conductor when a magnetic field is applied perpendicular to the current flow. In semiconductors, the Hall voltage is directly related to the type of charge carriers present, allowing us to determine the type of semiconductor.

4. Can a semiconductor have both N-type and P-type characteristics?

Yes, a semiconductor can be doped with both N-type and P-type materials, creating what is known as an N-type and P-type junction. This allows for the creation of more complex electronic devices such as transistors.

5. How do impurities affect the characteristics of a semiconductor?

Impurities, also known as dopants, play a crucial role in determining the type and conductivity of a semiconductor. They can add extra electrons or holes to the material, altering its electrical properties and allowing for the creation of different types of semiconductors.

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