There are already multiple solar roof cars. This should make it easier to integrate solar into these designs.

This is the worlds cheapest SOLAR CAR: https://www.youtube.com/watch?v=Hk6aTKV-des https://www.solarkycar.com/

Alin Chinese Electric Car with Solar Panel CE Approved Electric City Cars, US$1,500.00-2,000.00: https://alinmachinery.en.made-in-china.com/product/zZHTdphPH...

Chinese EV company tests flexible solar sunroof for 50 miles of additional range per day: https://interestingengineering.com/transportation/hongqi-per...

Here's a similar article from 2013, talking about a paper from 2005:

https://www.fastcompany.com/1681384/you-may-soon-just-spray-...

"Some day, homeowners eager to produce their own energy might not line their roofs with solar panels. Instead, they’ll spray-paint them with a mist full of electricity-generating solar cells."