Re: what type of diode can be use to block current back flow for solar panel>
Its normal Schottky diode, just case is different to better sustain of power dissipation.
If you insist on classic case design check P600 its for 6A or 80SQ040, 6A1S GLX, HER605 GLX. Standard diode makes higher voltage drop then Schottky.
I suggest that you read part datasheet and pay attention on part specification and capabilities in relation with temperature. Usually on roof temperature at solar cells panels temperature is much much higher then 25C.