NOVELTY - Photovoltaic electrochromic device (100) comprises: a transparent substrate (102); many thin-film solar cells formed on the substrate, where each of the thin-film solar cells comprises an anode, a photoelectric conversion layer and a cathode, and a portion of a surface of the anode is exposed from each of the thin film solar cells; many electrochromic thin films (106) respectively disposed on at least one surface of the cathode and the exposed surface of the anode; and an electrolyte (108) layer covering the thin films, where the anode and cathode serve as an anode and a cathode of the device.    USE - The photovoltaic electrochromic device is useful: as a general thin-film solar cell for generating electricity; and to fabricate color-changing rear view mirrors, displays and electric devices with battery gauge.    ADVANTAGE - The photovoltaic electrochromic device (which changes the color of electrochromic thin films when being illuminated) performs color change without additional power source. The photovoltaic electrochromic device can be deemed as a solar cell having electrical power generation capability and a smart window.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing the photovoltaic electrochromic device, comprising: forming may thin-film solar cells on a transparent substrate, where each of the thin-film solar cells comprises at least an anode, a photoelectric conversion layer and a cathode, and a portion of a surface of the anode is exposed from each of the thin film solar cells; depositing an electrochromic thin film on at least one surface of the cathode and the exposed surface of the anode; and forming an electrolyte layer on surfaces of the thin-film solar cells to cover the electrochromic thin films, where the anode and the cathode of each of the thin-film solar cells also serve as the anode and the cathode of the photovoltaic electrochromic device.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view depicting a structure of a conventional solid-type electrochromic device.    Solid-type electrochromic device (100)    Glass or plastic transparent substrates (102)    Transparent conductive layer (104)    Electrochromic thin film (106)    Solid electrolyte (108)