IIT Mandi Researchers Generate Electrical Energy from Household LED Light Sources

New Delhi: A group of scientists at the IIT Mandi have created a new photovoltaic material that may produce electricity when exposed to light from CFL or LED lightbulbs or other common domestic lighting sources.

Researchers Dr. Ranbir Singh, a Ramanujam Fellow faculty member, Prof. Satinder Kumar Sharma, School of Computing & Electrical Engineering from IIT Mandi, Dr. Vikrant Sharma, National Institute of Solar Energy (NISE), Gurugram, Dr. Vivek Kumar Shukla, Gautam Buddha University, Greater Noida, and Mritunjaya Parashar, University of North Texas, Denton, USA, collaborated on a paper that was published in the journal Solar

This study confirms the growing acceptance of IoT technology in modern culture. Mobile phones, smart homes, and other applications that demand various types of real-time data are using IoT devices more and more frequently. These Internet of Things (IoT) gadgets must be able to operate without the assistance of electrical grids, hence they are currently powered by primary and secondary batteries. No of the type, all batteries have a limited lifespan and are neither economical nor environmentally friendly.

Promising alternatives to batteries for powering such gadgets include light-induced power generators. Solar cells use the sun's light to generate electricity, however as many IoT devices are used indoors, this option is not available. Finding ways to use light from indoor lighting sources to generate electricity to operate indoor equipment like sensors, tools, Wi-Fi routers, RFID readers, etc. is an alternative.

The multi-institutional team has created thin-film photovoltaic cells with high efficiency that can produce electricity from any type of light. Perovskites, a kind of crystals that can absorb light and produce electricity, serve as the foundation for these cells. Perovskites have been investigated for solar energy production for a very long time. This research team has looked into novel perovskite materials that can be utilised to harvest artificial light from indoor sources in addition to sunlight.

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"We have synthesised a photoactive quasi-cubic structured perovskite material by adding Formamidinium (FA+) cation in Methylammonium Lead Iodide (MAPbI3) perovskite material," Dr. Ranbir Singh of IIT Mandi remarked when explaining the technical aspects of this work.

The physics of the device under indoor illumination circumstances has been thoroughly investigated, along with the light absorption, morphology, charge transport, and electron trap states of the perovskites. Under indoor lighting circumstances, the manufactured PVs showed a photoelectric conversion efficiency of 34.07 percent.

For indoor applications, the photoelectric conversion efficiency values are comparable to the best-in-class perovskites. The primary researcher adds that this discovery offers a viable candidate for the creation of photovoltaic materials to utilise quasi-cubic perovskites to harvest the energy of indoor light.

Due to the exponential development in the use of smart devices in applications like wellness and health monitoring, smart homes, logistics, smart manufacturing, etc., indoor light-induced power production will be sought after more and more in the near future.

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