NOVELTY - The energy harvesting device comprises a solar cell (320) comprising an active layer (305) for receiving a first range of electromagnetic frequencies, a layer (303) that comprises spiral antenna structures (301) for receiving radio frequency (RF) energy (302) and is formed on a first side of the solar cell, and a semiconductor layer that absorbs infrared (IR) energy and is formed on a second side of the solar cell, where the second side is opposite to the first side. The semiconductor layer comprises spectral response structures for absorbing a second range of electromagnetic wavelengths.    USE - The energy harvesting device such as multifunction, reconfigurable energy harvesting device (claimed) is useful for receiving, storing and/or collecting energy such as RF energy, IR energy and ambient heat energy, from various energy sources such as man-made sources and naturally available energy sources including sun, in various settings such as urban settings.    ADVANTAGE - The energy harvesting device is lightweight, portable and cost-efficient, has the ability to receive, convert and/or store multiple sources of various types of energy including wire-free sources of energy, and can adapt with the changing availability of energy sources to optimally harvest energy and increase a yield power output.    DETAILED DESCRIPTION - The energy harvesting device comprises a solar cell (320) comprising an active layer (305) for receiving a first range of electromagnetic frequencies, a layer (303) that comprises antenna structures (301) for receiving radio frequency (RF) energy (302) and is formed on a first side of the solar cell, and a semiconductor layer that absorbs infrared (IR) energy and is formed on a second side of the solar cell, where the second side is opposite to the first side. The semiconductor layer comprises spectral response structures for absorbing a second range of electromagnetic wavelengths different than the first range of electromagnetic frequencies. The spectral response structures comprise epitaxially grown ring-shaped structures having diameters in a range of 700 nm to 1000 microm. The active layer comprises an inorganic semiconductor. The semiconductor layer includes a first semiconductor for absorbing IR energy of a first frequency range and a second semiconductor for absorbing IR energy of a second frequency range, where the first and second semiconductors are separated by an electrode. The first range of electromagnetic frequencies comprises a range including UV and visible light. INDEPENDENT CLAIMS are included for:    (1) an array of multifunction, reconfigurable energy harvesting devices; and    (2) a method for forming an energy harvesting device.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic perspective view of a multifunction, reconfigurable energy harvesting device.    Spiral antenna structures (301)    RF energy (302)    Layer comprising antenna structures (303)    Active layer (305)    Solar cell. (320)