Are you frustrated by how quickly your battery drains? Imagine not having to fret about that anymore.
A team of researchers led by the National University of Singapore (NUS) has made a breakthrough in energy harvesting technology that might eliminate the necessity for batteries in a wide range of electronic devices. They have developed a brand new rectifier that may convert normally wasted radio frequency (RF) signals, corresponding to Wi-Fi and cellular signals, into usable direct current (DC) energy.
With this technology, a future where you never must worry about your gadgets running out of battery could develop into a reality. This revolutionary study was published in Nature electronics on July 24, 2024
What is “harvesting” energy?
Harvesting is the technique of collecting and converting ambient energy into usable power. This technology enables small devices to make use of RF signals to cut back their dependence on batteries, extend their lifespan and reduce their environmental impact.
It also enables distant devices to be powered remotely, without having to physically replace batteries. This technology makes using wireless sensor networks and IoT devices in hard-to-reach places more practical and sustainable.
Read also: Singapore captured 68% of Southeast Asia’s tech funding in H1 2024
Overcoming limitations
Unfortunately, this technology still has some limitations. The captured radio signals have to be near the electronic devices. In addition, existing tools, corresponding to Schottky diodes, are inefficient at converting weak radio signals (normally below -20 dBm) into electricity.
However, NUS researchers have managed to resolve this problem by developing a brand new tool that’s way more sensitive and efficient. Using a nanoscale spin rectifier (SR), the technology can convert low-power RF signals with greater efficiency.
The basis of this technology is a particularly small magnetic tunnel junction (MTJ) fabricated from a special material CoFeB/MgO, which is usually utilized in computer memories. Scientists have modified this MTJ to convert radio signals into electricity. They have succeeded in creating a particularly sensitive device that may convert even weak radio signals into enough energy to power a temperature sensor.
By integrating a nanoscale spin rectifier (SR) into the energy harvesting module, the research team was in a position to power a industrial temperature sensor at -27 dBm. The harvested energy was sufficient to power an LED and a industrial temperature sensor, with the array of 10 optimized rectifiers achieving 7.8% efficiency and high sensitivity.
Battery-Free Future: What’s Next?
The researchers are currently working on integrating on-chip antennas to enhance the efficiency and compactness of their technology. They are also investigating the usage of series-parallel connections and on-chip communications to optimize RF power harvesting and generate sufficient voltage without the necessity for a DC amplifier.
These advances have the potential to eliminate the necessity for batteries in lots of electronic devices and, in turn, create more self-sufficient and environmentally friendly devices that may operate for longer periods without recharging, especially in distant or hard-to-reach places.
