I have a hard time understanding the I-V curve of a solar cell. I dont understand how in an short circuit a current can happen although there is no voltage? Isn't voltage the requirement for a current, so if voltage is zero, current must be zero? Or is there another driving force behind the current?
Second, where does the voltage come from at all? I always thought the potential stems from the p-n junction but i read a few sources that tell me that the pn junction actually only serves to seperate the charges (if i understood correctly), i.e.: http://energyprofessionalsymposium.com/?p=22032 & https://www.pveducation.org/pvcdrom/solar-cell-operation/the-photovoltaic-effect
In the second link it states that for the voltage to increase the charges must build up? but how can they build up? arent they always connected? I am totally confused =)