https://phys.org/news/2018-08-zapping-approach-solar-cells.html

Sheets and flakes of this few-layer phosphorus, just a few billionths of a metre thick, could improve the efficiency of certain types of photovoltaic cells, the research team led by Professor Joseph Shapter claim.

Solar cells based on carbon nanotubes and silicon are promising as a cheaper and easier-to-manufacture alternative to crystalline silicon cells. However one challenge with these new solar cells is boosting the efficiency they convert sunlight into electricity.