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Table. 4.

Explanations about a principle of diode presented in university physics textbooks.

Category Contents General Physics Modern Physics
G1 G2 G3 G4 M1 M2 M3 M4
Description Explain the movement of electrons and holes by an electric field caused by an external voltage × × × × × ×
Explain a depletion region appearing at the PN junction × ×
Explain the potential difference in the PN junction when an external voltage is not applied ×
Explain an electric field appearing at the PN junction × × × × ×
Explain the potential change of the pn junction when an external voltage is applied × ×
Explanation of the two types of current (diffusion current, drift current) × ×
Explanation of changes in the width of the depletion region according to the external voltage × × × × × ×
Explain that the most of the voltage is applied to the depletion region × × × × ×
Explain that a small amount of current flows even in reverse voltage ×
Explanation of the sudden flow of current when a large reverse voltage is applied × × × ×
Illustration Expression of depletion region × × × ×
Expression of minority carrior × × ×
Placing the depletion region and the potential graph together × × × × × ×
Presenting the band model according to the pn junction × × × ×
New Phys.: Sae Mulli 2021;71:1044~1057 https://doi.org/10.3938/NPSM.71.1044
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