NOVELTY - Energy generating device comprises: daylight energy harvesting unit; power management unit located in close physical proximity to and electrically connected to daylight energy harvesting unit; and infrared energy harvesting unit located in close physical proximity to and electrically connected to power management unit (30). The daylight energy harvesting unit and the power management unit are bonded to be discretely integrated. The infrared energy harvesting unit and the power management unit are bonded to be discretely integrated.    USE - The device is useful for generating energy.    ADVANTAGE - The device utilizes a very small amount of semiconductors and capable to scavenge the energies from both day and night radiations, thus the overall cost of the device is significantly reduced and the device operates 24/7.    DETAILED DESCRIPTION - Energy generating device comprises: a daylight energy harvesting unit; a power management unit located in close physical proximity to and electrically connected to the daylight energy harvesting unit; and an infrared energy harvesting unit located in close physical proximity to and electrically connected to the power management unit (30). The power management unit consists of a complementary metal-oxide-semiconductor-based integrated circuit configured to manage and control the energy scavenged by the energy harvesting unit such that the power management unit regulates voltage output, and the power management unit comprises at least one capacitor for temporarily storing energy. The daylight energy harvesting unit and the power management unit are bonded to be discretely integrated. The infrared energy harvesting unit and the power management unit are bonded to be discretely integrated. The daylight energy harvesting unit is stacked above the power management unit, and the power management unit is stacked above the infrared energy harvesting unit. The daylight energy harvesting unit comprises an absorption material comprising silicon, amorphous silicon, silicon:germanium, gallium nitride, gallium arsenic, indium gallium arsenic, indium phosphide, cadmium tellurium, cadmium sulfide and polymer. The infrared energy harvesting unit comprises an absorption material comprising indium gallium arsenic, indium phosphide, indium antimony, and mercury cadmium tellurium.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of scavenging device unit.    Output device (15)    Energy harvesting unit (20)    Power management unit (30)    Contacts (46)    Bumps (48)