Everywhere I search, the thermal voltage in diodes is described either as
- the microscopic property related to the average energy of electrons due to thermal motion
- The constant in the ideal diode equation.
Now, I'd like to know the macroscopic significance of the thermal voltage. For example, something like it being the voltage across the diode in comparison to a diode a 0k if it were true.
It being a constant in the ideal diode equation is not so satisfying; I plotted typical values in the equation (https://www.desmos.com/calculator/fiwyqzw5ci ). There appears to be no discernible feature at is at the thermal voltage (black line), whereas the turn on voltage of 0.7 is a readily visible feature (blue line).