TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: In the device, a composition of the electrochromic thin films comprises: a polymer formed by electropolymerization of aniline monomer, 3,4-ethylenedioxythiophene (EDOT) monomer or viologen monomer; or electroplating of ferric-ferrocyanide chromophore or nickel oxyhydroxide or tungsten trioxide thin film. In the device, a material of the electrochromic thin films comprises a transition metal oxide (preferred) and Prussian blue (RTM: Iron(III)-hexacyanoferrate(II)). The anode of one of the thin-film solar cells is electrically connected to the cathode of another thin-film solar cell. The anode is exposed between the cathodes, and a shading area of the electrochromic thin film is determined by a width of an interval between the cathodes. The thin-film solar cells further comprise a passivation layer disposed on a sidewall of the photoelectric conversion layer of each of the thin-film solar cells. The electrolyte layer comprises solid electrolyte or liquid electrolyte. The liquid electrolyte comprises an alkali metal salt and a solvent. The transparent substrate comprises a glass, plastic or flexible substrate. The photovoltaic electrochromic device further comprises: a transparent non-conductive substrate covering the electrolyte layer; a reflective film disposed on a surface of the transparent non-conductive substrate to form a mirror; a direct current (DC)/alternating current (AC) inverter to convert current generated by the thin-film solar cells into electric utilities; a DC charge storage device to store the current generated by the thin-film solar cells; and a thin-film transistor connected to the anode and the cathode of each of the thin-film solar cells to control a switch between each of the thin-film solar cells and an exterior circuit. The electroplating solution comprises: aniline monomer, EDOT monomer or viologen monomer; ferric-ferrocyanide chromophore; or nickel oxyhydroxide or peroxytungstate electroplating solution. Preferred Method: The step of depositing the electrochromic thin film comprises: disposing an electroplating solution to be in contact with the anode and the cathode of each of the thin-film solar cells; illuminating the thin-film solar cells to generate current, which causes redox reaction in the electroplating solution to form the electrochromic thin film on at least one surface of the anode and the cathode; and removing the electroplating solution. The step of depositing the electrochromic thin film comprises electron beam evaporation, ion-assisted coating, reactive and non-reactive sputtering, or thermal evaporation. The step of forming the thin-film solar cells on the transparent substrate further comprises forming a passivation layer on a sidewall of the photoelectric conversion layer of the thin-film solar cell. The step of forming the electrolyte layer comprises: electrolytic depositing the solid electrolyte on the surfaces of the thin-film solar cells; and successively vacuum depositing the solid electrolyte on the surface of the thin-film solar cells. The manufacturing method further comprises: disposing a transparent non-conductive substrate to cover the electrolyte layer after forming the electrolyte layer; bonding the transparent substrate, the electrolyte layer, and the transparent non-conductive layer with a laminator or an autoclave after forming the electrolyte layer; and forming a reflective film on a surface of the transparent non-conductive substrate to form a mirror before disposing the transparent non-conductive substrate to cover the electrolyte layer.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The transition metal oxide is tungsten oxide, molybdenum trioxide, vanadium(V) oxide, niobium pentoxide, nickel(II) oxide, tin oxide, ferric oxide, cobalt oxide, iridium oxide, rhodium oxide or manganese dioxide. The thin-film solar cells comprise silicon thin-film solar cells, copper indium gallium (di)selenide thin-film solar cells or cadmium telluride thin-film solar cells. The silicon thin-film solar cells comprise amorphous silicon (a-Si) thin-film solar cells, a-Si/microcrystalline (mc)-Si tandem thin-film solar cells, a-Si/a-Si tandem thin-film solar cells or multi junction a-Si thin film solar cells. The thin-film solar cells are connected in series.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The alkali metal salt comprises lithium triflate, lithium perchlorate, or tetra alkyl ammonium salt. The solvent comprises propylene carbonate, dipropyl carbonate, glycol carbonate, gamma -butyrolactone, acetonitrile, tetrahydrofuran, or N-methyl-2-pyrrolidone. The solid electrolyte comprises an alkali metal, a solvent and a polymer.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer comprises poly(ethylene oxide), poly(propylene oxide), poly(vinyl butyral) and/or poly(methyl methacrylate). EXAMPLE - No suitable example given.