It already exists. https://solaractionalliance.org/solar-paint/ https://solaractionalliance.org/solar-paint/ It just has very poor efficiency compared to pane

It already exists. https://solaractionalliance.org/solar-paint/ https://solaractionalliance.org/solar-paint/ It just has very poor efficiency compared to panels, and so is not economically viable and probably won't be for some time.