Logically @kenso is right in what he is saying and to argue that point you are the sillier person.

Some should be pointing out why they are black in the first place.

Question

Why does black colour absorb more heat or why does white reflect more heat?

Solution

The darker the object, the better it emits heat, because it's a better absorber of light. On the other hand, a white object appears white because it reflects all the different wavelengths and absorbs little to no light. It doesn't absorb much energy, then, and puts off little to no heat. Light energy can be converted into heat energy. A black object absorbs all wavelengths of light and converts them into heat, so the object gets warm. A white object reflects all wavelengths of light, so the light is not converted into heat and the temperature of the object does not increase noticeably.

Also

Black Backsheets vs White Backsheets

Once the silicon crystals are manufactured, they are adhered to a backsheet that arranges them into a grid pattern. This backsheet can be seen through the gaps between the cells, and impacts the overall appearance of the panel.

Black backsheets create a more uniform look to the solar panel, which helps it blend in with darker roof materials. However, the black color does hold some heat, so black backsheets may get hotter than traditional white backsheets. That said, the tradeoff in efficiency may be worth it for a more visually appealing solar installation.

Monocrystalline Silicon Makes Solar Panels Black

Why are solar panels black? Manufacturers use high-quality silicon crystals to create monocrystalline solar cells. During the production process, the silicon arranges itself in a single direction to form one large crystal. Because of this arrangement, the light interacting with the monocrystalline cells appears black to the human eye.

Two production factors make black monocrystalline panels more expensive than polycrystalline panels:

1. Forming a single large crystal uses more energy than creating the polycrystalline version.
2. The process wastes silicon as the large crystal is sliced wafer-thin to get the right size and shape for the PV panel.

However, the increased costs are worth it to many people, because monocrystalline solar cell panels are more efficient at creating electricity than polycrystalline solar cell panels.