Have any transparent solar-cells with high efficiencies been developed since the publication on this promising experimental cell last year:
http://onlinelibrary.wiley.com/doi/10.1002/adom.201470040/epdf
Unfortunately, neither of the several authors of this work is on ResearchGate.
This initial experimental effort was totally transparent, but had an efficiency of only about 0.4% ... but the experimenters could see improvements that would bring the efficiency up to 10%.
I am interested in finding-out if there have been developments and are NOW high-efficiency transparent (or translucent) solar-electric cells available that might be useful for powering reduced-visibility "stealthy" aerial drones?