At the present time, most PV research is aimed at lowering the cost, never mind the efficiency; but there is a minority effort to maximize efficiency at any cost. The paradigm here is something like the Mars Exploration Rovers, which are completely powered by multi-junction PV cells twice as far away from the Sun. We're obviously talking about a MY considerably later than 2013 before this kind of cell appears on an electric car. Even at this, an EREV40 would probably not fully recharge after a day in the sun. The real deal will be large stationary arrays, made using the cheaper cells, that you can plug into. Plugging in at a workplace, with arrays covering it's large roof area, would amount to the same thing (and at peak demand, this would negate the additional power load). Now, how do we make this happen?