Please can you check my concepts??
Under a normal PN junction diode before connecting any batteries we know that there comes a "potential barrier" due to intermixing of holes and electrons because of diffusion effects. But
Btw I also got a doubt on why current was 0 in a reverse bias and Referred to this sites answers so
do check my understanding and let me know if you find any faults:
In a reverse bias we know that because of extensive concentration of holes towards the cathode(where the -ve terminal of battery connects the p part of PN junction diode) and electrons towards the anode which induces an opposing electric field which counteracts the external electric field which got induced because of the battery inside the diode resulting in 0 net electric field inside the diode because of which current stops.
Here now as there is no electric field inside the diode at this point and this process is increasing the diffusion forces because the holes are even more concentrated(near the anode)and so are the electrons(towards anode aka where +ve terminal of battery connects the diode) hence because of diffusion effect more extensive the electrons present in holes also move a little bit towards the left end and holes to the right end till their electric field counters the effect of increased diffusion.
Is all of this correct? I have attached pics to illustrate my thoughts: