A photovoltaic device including a CIGS photovoltaic module having a so-called top surface, intended to be exposed to light radiation and a light emitting diode emitting light at a wavelength of less than 600 nm and transparent to radiation in the near infrared, attached to the top surface of the photovoltaic module. A photovoltaic generation system having: at least one such photovoltaic device a system of switches to selectively connect the photovoltaic module to the light emitting diode or to a terminal supplying an external load and a control circuit for controlling the system of switches. An electrical system having: such a photovoltaic generation system a battery connected to the supply terminal and at least one electronic circuit connected to the battery in order to be powered. An implantable medical device having such an electronic system.
