Engineered 'solar wood' material can generate electricity even after light is gone

Engineered 'solar wood' material can generate electricity even after light is gone

Researchers have solved a major solar energy challenge and turned wood into a complete solar energy system that continues to work after the sun has gone down.  While solar panel technology has come a long way, there is one aspect of it that's tough to beat: When the sun sets, so does the power. Storing energy during sunny times for later use is the most common solution, but it has drawbacks, too.  Storage systems typically require multiple layer…