To make a first impression to get, considering the first Shockley equation, the curve describes an ideal diode. Important here is the voltage range UD ≥ 0 In the field UD <0 is the only area of tension breakthrough interesting.
Legend
at room temperature
Silicon diodes begin at approximately 0.4 V power to lead. From this value increases in electricity expotentiell strongly. The operating point is 0.6-0.7 V.
When a negative voltage, the diode under the breakthrough voltage, depending on the design and materials used between-5V Zener diodes at up to 1000V at Si diodes.
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