## Depletion Region Charge Density Solution

STEP 0: Pre-Calculation Summary
Formula Used
Density of Depletion Layer Charge = (sqrt(2*[Charge-e]*[Permitivity-silicon]*Doping Concentration of Acceptor*modulus(Surface Potential-Bulk Fermi Potential)))
Qd = (sqrt(2*[Charge-e]*[Permitivity-silicon]*NA*modulus(Φs-Φf)))
This formula uses 2 Constants, 2 Functions, 4 Variables
Constants Used
[Permitivity-silicon] - Permittivity of silicon Value Taken As 11.7
[Charge-e] - Charge of electron Value Taken As 1.60217662E-19
Functions Used
sqrt - A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number., sqrt(Number)
modulus - Modulus of a number is the remainder when that number is divided by another number., modulus
Variables Used
Density of Depletion Layer Charge - (Measured in Electrons per Cubic Meter) - Density of Depletion Layer Charge is the amount of these fixed charges per unit area within the depletion region.
Doping Concentration of Acceptor - (Measured in Electrons per Cubic Meter) - Doping Concentration of Acceptor refers to the concentration of acceptor atoms intentionally added to a semiconductor material.
Surface Potential - (Measured in Volt) - Surface Potential is the electric potential at the surface of the semiconductor, specifically at the interface between the semiconductor and the insulator.
Bulk Fermi Potential - (Measured in Volt) - Bulk Fermi Potential is a parameter that describes the electrostatic potential in the bulk (interior) of a semiconductor material.
STEP 1: Convert Input(s) to Base Unit
Doping Concentration of Acceptor: 1.32 Electrons per Cubic Centimeter --> 1320000 Electrons per Cubic Meter (Check conversion ​here)
Surface Potential: 0.78 Volt --> 0.78 Volt No Conversion Required
Bulk Fermi Potential: 0.25 Volt --> 0.25 Volt No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Qd = (sqrt(2*[Charge-e]*[Permitivity-silicon]*NA*modulus(Φsf))) --> (sqrt(2*[Charge-e]*[Permitivity-silicon]*1320000*modulus(0.78-0.25)))
Evaluating ... ...
Qd = 1.61952637096272E-06
STEP 3: Convert Result to Output's Unit
1.61952637096272E-06 Electrons per Cubic Meter --> No Conversion Required
1.61952637096272E-06 1.6E-6 Electrons per Cubic Meter <-- Density of Depletion Layer Charge
(Calculation completed in 00.004 seconds)
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## Credits

Created by banuprakash
Dayananda Sagar College of Engineering (DSCE), Bangalore
banuprakash has created this Calculator and 50+ more calculators!
Verified by Dipanjona Mallick
Heritage Insitute of technology (HITK), Kolkata
Dipanjona Mallick has verified this Calculator and 50+ more calculators!

## <MOS Transistor Calculators

Sidewall Voltage Equivalence Factor
​ Go Sidewall Voltage Equivalence Factor = -(2*sqrt(Built in Potential of Sidewall Junctions)/(Final Voltage-Initial Voltage)*(sqrt(Built in Potential of Sidewall Junctions-Final Voltage)-sqrt(Built in Potential of Sidewall Junctions-Initial Voltage)))
Fermi Potential for P Type
​ Go Fermi Potential for P Type = ([BoltZ]*Absolute Temperature)/[Charge-e]*ln(Intrinsic Carrier Concentration/Doping Concentration of Acceptor)
Equivalent Large Signal Junction Capacitance
​ Go Equivalent Large Signal Junction Capacitance = Perimeter of Sidewall*Sidewall Junction Capacitance*Sidewall Voltage Equivalence Factor
Zero Bias Sidewall Junction Capacitance per Unit Length
​ Go Sidewall Junction Capacitance = Zero Bias Sidewall Junction Potential*Depth of Sidewall

## Depletion Region Charge Density Formula

Density of Depletion Layer Charge = (sqrt(2*[Charge-e]*[Permitivity-silicon]*Doping Concentration of Acceptor*modulus(Surface Potential-Bulk Fermi Potential)))
Qd = (sqrt(2*[Charge-e]*[Permitivity-silicon]*NA*modulus(Φs-Φf)))

## Why does the depletion layer form in a p-n junction?

The depletion layer forms in a p-n junction due to the diffusion of majority charge carriers (holes and electrons) across the junction, resulting in the creation of a region depleted of these carriers.

## How to Calculate Depletion Region Charge Density?

Depletion Region Charge Density calculator uses Density of Depletion Layer Charge = (sqrt(2*[Charge-e]*[Permitivity-silicon]*Doping Concentration of Acceptor*modulus(Surface Potential-Bulk Fermi Potential))) to calculate the Density of Depletion Layer Charge, The Depletion Region Charge Density formula is defined as the amount of the fixed charges per unit area within the depletion region. Density of Depletion Layer Charge is denoted by Qd symbol.

How to calculate Depletion Region Charge Density using this online calculator? To use this online calculator for Depletion Region Charge Density, enter Doping Concentration of Acceptor (NA), Surface Potential s) & Bulk Fermi Potential f) and hit the calculate button. Here is how the Depletion Region Charge Density calculation can be explained with given input values -> 1.6E-6 = (sqrt(2*[Charge-e]*[Permitivity-silicon]*1320000*modulus(0.78-0.25))).

### FAQ

What is Depletion Region Charge Density?
The Depletion Region Charge Density formula is defined as the amount of the fixed charges per unit area within the depletion region and is represented as Qd = (sqrt(2*[Charge-e]*[Permitivity-silicon]*NA*modulus(Φsf))) or Density of Depletion Layer Charge = (sqrt(2*[Charge-e]*[Permitivity-silicon]*Doping Concentration of Acceptor*modulus(Surface Potential-Bulk Fermi Potential))). Doping Concentration of Acceptor refers to the concentration of acceptor atoms intentionally added to a semiconductor material, Surface Potential is the electric potential at the surface of the semiconductor, specifically at the interface between the semiconductor and the insulator & Bulk Fermi Potential is a parameter that describes the electrostatic potential in the bulk (interior) of a semiconductor material.
How to calculate Depletion Region Charge Density?
The Depletion Region Charge Density formula is defined as the amount of the fixed charges per unit area within the depletion region is calculated using Density of Depletion Layer Charge = (sqrt(2*[Charge-e]*[Permitivity-silicon]*Doping Concentration of Acceptor*modulus(Surface Potential-Bulk Fermi Potential))). To calculate Depletion Region Charge Density, you need Doping Concentration of Acceptor (NA), Surface Potential s) & Bulk Fermi Potential f). With our tool, you need to enter the respective value for Doping Concentration of Acceptor, Surface Potential & Bulk Fermi Potential and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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