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68 lines
2.4 KiB
Python
68 lines
2.4 KiB
Python
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from math import log
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from scipy.constants import Boltzmann, physical_constants
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T = 300 # TEMPERATURE (unit = K)
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def builtin_voltage(
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donor_conc: float, # donor concentration
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acceptor_conc: float, # acceptor concentration
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intrinsic_conc: float, # intrinsic concentration
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) -> float:
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"""
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This function can calculate the Builtin Voltage of a pn junction diode.
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This is calculated from the given three values.
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Examples -
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>>> builtin_voltage(donor_conc=1e17, acceptor_conc=1e17, intrinsic_conc=1e10)
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0.833370010652644
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>>> builtin_voltage(donor_conc=0, acceptor_conc=1600, intrinsic_conc=200)
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Traceback (most recent call last):
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...
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ValueError: Donor concentration should be positive
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>>> builtin_voltage(donor_conc=1000, acceptor_conc=0, intrinsic_conc=1200)
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Traceback (most recent call last):
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...
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ValueError: Acceptor concentration should be positive
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>>> builtin_voltage(donor_conc=1000, acceptor_conc=1000, intrinsic_conc=0)
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Traceback (most recent call last):
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...
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ValueError: Intrinsic concentration should be positive
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>>> builtin_voltage(donor_conc=1000, acceptor_conc=3000, intrinsic_conc=2000)
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Traceback (most recent call last):
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...
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ValueError: Donor concentration should be greater than intrinsic concentration
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>>> builtin_voltage(donor_conc=3000, acceptor_conc=1000, intrinsic_conc=2000)
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Traceback (most recent call last):
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...
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ValueError: Acceptor concentration should be greater than intrinsic concentration
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"""
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if donor_conc <= 0:
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raise ValueError("Donor concentration should be positive")
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elif acceptor_conc <= 0:
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raise ValueError("Acceptor concentration should be positive")
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elif intrinsic_conc <= 0:
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raise ValueError("Intrinsic concentration should be positive")
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elif donor_conc <= intrinsic_conc:
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raise ValueError(
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"Donor concentration should be greater than intrinsic concentration"
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)
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elif acceptor_conc <= intrinsic_conc:
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raise ValueError(
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"Acceptor concentration should be greater than intrinsic concentration"
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)
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else:
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return (
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Boltzmann
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* T
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* log((donor_conc * acceptor_conc) / intrinsic_conc**2)
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/ physical_constants["electron volt"][0]
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)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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