solar/electric hybrid automobile

I want an electric auto that has unlimited range/distance. I believe the solar/electric hybird is the solution. I know the auto industry is very competative around the world, and people have many different needs and preferrences for types/styles. so far the Tesla S seems to be the auto that has staying power. style/performance. why can't we improve this slighty by adding solar/recharge while driving???  this should not be that difficult as the technology is already available.!