Scientists have developed an innovative transparent energy-harvesting device capable of capturing power from both radio waves and sunlight, offering a reliable and sustainable energy source for wireless devices.
The new system, known as an optically transparent rectifying metasurface (RMS), is designed to collect radio frequency (RF) energy while efficiently transmitting visible light. Unlike traditional energy harvesters that rely on a single energy source, this dual-source approach ensures consistent power availability.
The device is made from indium tin oxide, a material that is transparent to the human eye, making it suitable for seamless integration into windows, displays, building facades, and vehicle components without affecting aesthetics or functionality.
Researchers optimized the energy harvester by incorporating a voltage-doubling rectifier circuit, enabling it to capture energy from the widely used 2.4 GHz and 5.8 GHz Wi-Fi bands. Tests showed that integrating this harvester with a solar cell increased the solar cell’s power output by 13.11%, demonstrating the effectiveness of combining radio waves and sunlight for enhanced energy generation.
With 80% optical transparency and RF-to-DC conversion efficiencies of 19.64% at 2.4 GHz and 7.92% at 5.8 GHz, this technology paves the way for self-powered smart surfaces, wireless sensors, and energy-efficient electronics. Researchers believe this hybrid energy harvesting system could contribute to a more sustainable future by enabling uninterrupted power supply for a wide range of devices.