Black doesn’t reflect as well as, for instance, white, and black also absorbs heat well.
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Solar panels are designed to absorb as much energy as possible in order to turn it into electricity. And when materials absorb light it turns dark. And modern solar panels is able to absorb almost all of the energy in the incoming light so they become almost completely black. The problem is rather than they are unable to convert all the energy into electricity and instead it is turned into heat. Manufacturers would prefer if they could emit the energy they are unable to convert to electricity as light and this is one of the stategies in the development of more efficient solar panels. But for the moment the best way to generate electricity from the light is to absorb all the light.
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