solar panel Copper

[claude07]

I am looking to make solar panels to do several things:

- make a fridge, air conditioner, or freezer. (silica gel + water >> sun >> evaporation >> at night, frozen !!!) for the summer
- make a heating for the winter / ventilation with a termostat ....
- make a solar water heater

for that, I am looking for copper plates. where do we buy it?
nothing found on the net.
please