Sure, it lets through starting at 0.7 volts. But isn't that because the applied voltage of 0.7 volts is high enough to allow sufficient current to flow in the forward direction? The diode has a bulk resistance.
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Your considerations are probably based on the fact that a started current flow further favors the subsequent current flow.
This phenomenon actually exists, but has nothing to do specifically with the diode, but are thermal effects that make the channel more conductive due to increased temperature, because the flowing current heats the channel.
However, a current flow is always dependent on the applied voltage and, by the way, a current flows through a diode even before the transmission voltage. A diode follows an e-function!
Thank you for your detailed explanation.
The two layers of the pn diode (n-doped or p-doped) exist by mutual compensation of the p- or n-layer carrier a layer (the so-called barrier layer) in which no free charge carriers exist. However, this layer is extremely thin compared to the dimensions of the diode.
By applying an external voltage, however, this layer is made even narrower or more transparent, so that electrons which are accelerated by the applied voltage (more precisely: due to the resulting E field with force effect) can pass through this layer to an increasing extent (depending on the voltage) (movement energy and diffusion).
This electron flux thus forms a current which, for physical reasons, depends on the applied voltage via an e function.
It has been found that at about 0.6 to 0.7 volts the current has a value (some milli-amperes), which is usually used in electronic circuits. That is why it is said that the diode “wound” from 0.7V – thus allows a current. However, even at, for example, 0.3 V, a very small current flows in the micro-ampere region.
However, this does not apply when the voltage direction is reversed, whereby the barrier layer is then further widened. This means that no current can flow (Sperr mode).
Look at the pn diode. With the explanation of the change in the space charge zone due to higher voltage, I must explain it well.
Google for diocesan lines too.
The diode depends on nothing. The current can be dependent on the voltage or the voltage from the current. The question is unclear.
Don’t really understand your question.
Maybe this will help you:
https://www.elektronik-kompendium.de/sites/bau/0201113.htm