The project objective will be the fabrication of an energy harvester for 5G applications in the band 24-26 GHz, for which these systems of electromagnetic energy scavenging have not yet been optimized; moreover, there does not still exist an environmental-friendly approach that is CMOS-compatible as well. The latter aspect is one of the NANO-EH targets, which aims at providing the technological base for the large-scale exploitation of different energy sources, thus creating smart and energetically autonomous telecommunication systems. While the design of the antenna will follow the traditional concept of high-efficiency and high-gain planar radiating elements, the key aspect for the rectenna will be the diode. In detail, hafnium oxide-based ferroelectric materials will be the main choice for vertical MIM (Metal-Insulator-Metal) diodes with cutoff frequency in the order of tens (up to hundreds) of GHz, with very small contact areas (up to hundreds of square nanometers) and a nanometric thickness. On the other hand, two-dimensional materials like molybdenum disulfide (MoS₂) will be deployed for the fabrication of geometric planar diodes with new performance in terms of microwave signal detection.