A New Thermoelectric Nanoantenna

Collaborators of three labs in Mexico have demonstrated an innovative nanodevice for harvesting solar energy.

The study paper has been published in the SPIE Journal of Nanophotonics. The paper, “Thermoelectric efficiency optimization of nanoantennas for solar energy harvesting,” reports that evolutive dipole nanoantennas (EDN) generate a thermoelectric voltage three times larger than the classic dipole nanoantenna.

Capturing visible and infrared radiation using nanodevices is an essential aspect of collecting solar energy: solar cells and solar panels are common devices that utilize nanoantennas, which link electromagnetic radiation to specific optical fields. The EDN antenna can be useful in many areas where high thermoelectric efficiency is needed from energy harvesting to applications across the aerospace industry.

Professor Ibrahim Abdulhalim, JNP Associate Editor, SPIE Fellow and a professor in the Electrooptics and Photonics Engineering Department at Ben-Gurion University of the Negev said, “The paper reports on a novel design and demonstration of a nanoantenna for efficient thermoelectric energy harvesting. They demonstrated thermoelectric voltage three times larger than a classical antenna. This type of antenna can be useful in many fields from harvesting of energy from waste heat, in sensing and solar thermal energy harvesting.”

The nanoantennas are bimetallic, using nickel and platinum, and were fabricated using e-beam lithography. The nanoantenna design was optimized using simulations to determine the distance between the elements. In comparing their thermoelectric voltage to the classic dipole nanoantenna, the EDNs were 1.3 times more efficient. The characterization was done using a solar simulator analyzing the I-V curves. The results indicate that EDN nanoantenna arrays would be good candidates for the harvesting of waste heat energy.

The article authors are Javier Mendez-Lozoya of Terahertz Science and Technology National Lab, Universidad Autonoma de San Luis Potosi, Mexico; Ramon Diaz de Leon-Zapata, of Tecnologico Nacional de Mexico, San Luis Potosi, Mexico; Edgar Guevara of Terahertz Science and Technology National Lab and Catedras CONACYT, Universidad Autonoma de San Luis Potosi, Mexico; Gabriel Gonzalez of Terahertz National Lab and Catedras CONACYT, Universidad Autonoma de San Luis Potosi, Mexico; and Francisco J. Gonzalez, of Terahertz Science and Technology National Lab, Universidad Autonoma de San Luis Potosi, Mexico.

One finds this as quite exciting right up to the word platinum. That element is the most expensive raw material on earth. But the methodology has a firm toehold now, with some hope that alternative materials can be made to meet or exceed these results. Congratulations are in order and hopes of God’s speed to this team. May the innovation continue!