Spinach, Popeye’s favorite food, gives solar tech some muscle

Should we them Popeye solar cells?

Silicon wafers coated in a protein extracted from spinach produce an electric current that is nearly 2-1/2 times higher than the previously best level reported for so-called biohybrid solar cells.

The protein, called photosystem 1 (PS1), converts sunlight into electrical energy. For the last few decades, researchers have learned how to extract and harness PS1 to create solar cells, but the amount of power these cells produce is a trickle compared to conventional photovoltaic cells.

The new approach pioneered by researchers at

To do it, the team doped a silicon wafer in positively charged atoms and then poured PS1 extracted from spinach on the wafer. In tests, they found it produces 850 microamps of current per square centimeter at 0.3 volts.

To put that in context, the researchers expect a two-foot panel with this combination could power several types of small electrical devices.

The findings are reported in the Sept. 4 issue of

“If we can continue our current trajectory of increasing voltage and current levels, we could reach the range of mature solar conversion technologies in three years,”