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‘World’s first off-road solar SUV’ just drove across Morocco powered only by the sun
(edition.cnn.com)
This is a most excellent place for technology news and articles.
I'm not very well versed in solar tech, but what I think I know is that we've already approached about the max efficiency out of solar already, so there probably won't be large gains going forward.
silicon solar panels are at their limit which is something like 30% efficient. Newer chemistry will go beyond that but as the other comment said even with double the power there isn't enough energy in sunlight for a car sized panel to get a car going for too long. Especially when there are clouds out (most of the time here)