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76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
# https://en.wikipedia.org/wiki/Charge_carrier_density
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# https://www.pveducation.org/pvcdrom/pn-junctions/equilibrium-carrier-concentration
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# http://www.ece.utep.edu/courses/ee3329/ee3329/Studyguide/ToC/Fundamentals/Carriers/concentrations.html
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from __future__ import annotations
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def carrier_concentration(
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electron_conc: float,
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hole_conc: float,
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intrinsic_conc: float,
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) -> tuple:
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"""
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This function can calculate any one of the three -
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1. Electron Concentration
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2, Hole Concentration
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3. Intrinsic Concentration
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given the other two.
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Examples -
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>>> carrier_concentration(electron_conc=25, hole_conc=100, intrinsic_conc=0)
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('intrinsic_conc', 50.0)
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>>> carrier_concentration(electron_conc=0, hole_conc=1600, intrinsic_conc=200)
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('electron_conc', 25.0)
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>>> carrier_concentration(electron_conc=1000, hole_conc=0, intrinsic_conc=1200)
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('hole_conc', 1440.0)
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>>> carrier_concentration(electron_conc=1000, hole_conc=400, intrinsic_conc=1200)
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Traceback (most recent call last):
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File "<stdin>", line 37, in <module>
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ValueError: You cannot supply more or less than 2 values
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>>> carrier_concentration(electron_conc=-1000, hole_conc=0, intrinsic_conc=1200)
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Traceback (most recent call last):
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File "<stdin>", line 40, in <module>
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ValueError: Electron concentration cannot be negative in a semiconductor
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>>> carrier_concentration(electron_conc=0, hole_conc=-400, intrinsic_conc=1200)
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Traceback (most recent call last):
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File "<stdin>", line 44, in <module>
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ValueError: Hole concentration cannot be negative in a semiconductor
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>>> carrier_concentration(electron_conc=0, hole_conc=400, intrinsic_conc=-1200)
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Traceback (most recent call last):
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File "<stdin>", line 48, in <module>
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ValueError: Intrinsic concentration cannot be negative in a semiconductor
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"""
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if (electron_conc, hole_conc, intrinsic_conc).count(0) != 1:
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raise ValueError("You cannot supply more or less than 2 values")
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elif electron_conc < 0:
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raise ValueError("Electron concentration cannot be negative in a semiconductor")
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elif hole_conc < 0:
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raise ValueError("Hole concentration cannot be negative in a semiconductor")
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elif intrinsic_conc < 0:
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raise ValueError(
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"Intrinsic concentration cannot be negative in a semiconductor"
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)
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elif electron_conc == 0:
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return (
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"electron_conc",
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intrinsic_conc**2 / hole_conc,
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)
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elif hole_conc == 0:
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return (
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"hole_conc",
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intrinsic_conc**2 / electron_conc,
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)
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elif intrinsic_conc == 0:
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return (
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"intrinsic_conc",
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(electron_conc * hole_conc) ** 0.5,
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)
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else:
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return (-1, -1)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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