We compared 9 × 9 arrays of bimetallic Ni(Nickel)-Pt(Platinum) nanoantennas for a classic and evolutive dipole configuration. We fabricated the nanoantennas by e-beam lithography and characterized them with a solar simulator to analyze the I − V curves. From these curves, a thermoelectric voltage dependence associated by classic and evolutive dipole configuration was observed. We show that the evolutive dipole nanoantennas (EDN) generate up to three times more voltage in contrast with the classic dipole nanoantenna (CDN). Indeed, the evolutive configuration is 1.3 times more efficient than its classical counterpart. The results are corroborated by absorbance of these nanoantennas in the 20 to 36 THz range, where EDN is 40% more efficient than CDN and 30% in the range of 36.1 to 90 THz. Moreover, the experimental results match the thermoelectric behavior obtained using numerical simulations. The EDN can be used in applications ranging from aerospace technology to energy harvesting, photodetector, and sensors, where high thermoelectric efficiency is needed.
We present the thermal study of micro thermocouples fabricated by electron beam lithography process, the micro thermocouples (MTCs) are based on a recently discovered thermoelectric effect in single-metal nanostructures with cross-sectional discontinuity, single-metal MTCs would simplify the fabrication process and allow the large-scale production of these devices using fabrication technologies such as nanoimprint lithography. In this work, we have investigated the temperature difference between the asymmetric unions of the micro thermocouples using Optotherm EL InfraSight 320 thermal imaging camera. Results show that single-metal MTCs are promising structures that could be used to harvest thermal radiation and generate electric energy through the Seebeck effect.
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