A new solar cell could go through the laundry and emerge still working. The photovoltaic cell, developed by Japanese research institution RIKEN and the University of Tokyo, is ultra thin and coated on both sides with waterproof film. The solar cell can be stretched or compressed or washed and continue to function.
Researchers in Japan have created a waterproof solar cell able to withstand a wash and keep on generating power. They developed flexible, super thin, organic photovoltaic cells based on PNTz4T, a material they developed in the past. Both sides of the cell were covered with an acrylic-based elastomer that allowed light to reach the cells, but prevented air and water from leaking on to them.
The researchers then tested the waterproof solar cells to see if they’d retain efficiency. The initial device had an efficiency of 7.9 percent – per square centimeter it generated a current of 7.86 milliwatts. They soaked the cells in water for two hours and then found the efficiency had decreased by 5.4 percent. They also compressed the device by almost half for 20 cycles, while subjecting it to water, and found it had 80 percent of the initial efficiency.
Photovoltaics integrated in textiles in the past have suffered from a lack of energy efficiency, or they weren’t robust and didn’t resist being deformed well, or they weren’t stable over the long-term in water or air – or some combination of those three. This new waterproof cell, that’s able to be compressed, could open up more options for wearables with solar cells. The photovoltaic cells could power sensors that record body temperature and heartbeats or provide early warnings of health issues, according to research group leader Takao Someya.
The journal Nature Energy published the research online earlier this week.
Images via RIKEN