Reason for change in deformation if we switch from n to p

In summary, the difference in mechanical properties of n and p type silicon explains the varying values of deformation at different pressures, and the maximum pressure limit of 3000 Kpa for the sensor.
  • #1
Ganga Raju
6
0
In the research paper, a piezoresistive pressure sensor is designed.
My question is if we look at table 1
in column 1 the values of deformation of diaphragm for single crystal silicon n type is used
If we interchange n type and p type the values for 1000,2000 Kpa are same and then the values changes, why ?
and why n,p type is not getting any deformation after 3000 Kpa ?
 

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  • #2
The reason why the values of deformation of the diaphragm for single crystal silicon n type and p type are different is because they have different mechanical properties. The n type silicon has a higher Young’s modulus and therefore experiences less deformation for the same pressure than the p type silicon. At 3000 Kpa, both n and p type silicon would not experience any deformation since this is the maximum pressure that the piezoresistive pressure sensor can measure.
 

1. What is the difference between n-type and p-type semiconductors?

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

2. How does switching from n-type to p-type affect deformation?

When switching from n-type to p-type, the direction of current flow is reversed. This results in a change in the direction of deformation, as electrons and holes (empty spaces where electrons should be) have opposite charges and move in opposite directions.

3. What is the reason for this change in deformation?

The change in deformation is due to the different charge carriers in n-type and p-type semiconductors. In n-type semiconductors, the majority charge carriers are electrons, while in p-type semiconductors, the majority charge carriers are holes. This difference in charge carriers leads to a change in the direction of deformation when switching between the two types.

4. How does this change in deformation affect the performance of semiconductors?

The change in deformation can affect the performance of semiconductors in various ways. For example, it can impact the efficiency of devices such as transistors, as the direction of current flow and therefore the direction of deformation can affect how the device functions. It can also affect the speed and reliability of electronic circuits.

5. Are there any other factors that can influence deformation in semiconductors?

Yes, there are other factors that can influence deformation in semiconductors, such as temperature and impurities. Temperature can affect the movement of charge carriers and therefore the direction and magnitude of deformation. Impurities, such as dopants, can also alter the number and type of charge carriers in a semiconductor, leading to changes in deformation.

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