Nearly every month there are fresh articles reporting news of further possible advances in solar technology. Most research aims at either improving the efficiency of the cells by capturing more of the electromagnetic spectrum. Either some modification of the crystal structure modifying the electron band gap or splitting the different wavelengths so that they are captured by semiconductors selective for these specific wavelenghts or by using organic dyes to help capture photons.
Other approaches aim to reduce the cost of solar by using less efficient systems that can be cheaply applied on large easily manufactured surfaces that can be incorporated into existing buildings and construction systems.
However, I'm not so sure that re-marketing Cadmium Yellow as "a paste of semiconducting nanoparticles called solar paint" is the smartest approach.