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DARPA’s Very High Efficiency Solar Cell (VHESC) program targets the development of photovoltaic devices with efficiencies significantly greater than those found today.
“Today’s top-of-the-line/state-of-the-art silicon solar cells are about 20 percent efficient”

The more common stuff that you will buy at large scale is between 14 and 15 percent. And what they call ‘low-cost’ solar cells – so-called ‘thin-film’ solar cells – are typically around 10 percent.

VHESC program is pursuing the development of 50 percent efficient solar-cell modules for near-term application as a battery charging module in tactical electronic devices.

Via Pol Bacquet