Photovoltaic system and the manufacturing method thereof

Abstract

A photovoltaic system consists of a waveguide body, luminescent dyes and a photovoltaic cell. Luminescent dyes and their aggregated particulates with larger diameter are dispersed in the waveguide body to scatter light and transform the first light of the external light into a second light, wherein the wavelength of the second light is longer than the wavelength of the first light. Compared to conventional techniques, the use of luminescent dyes of the present invention can be aggregated into particulates with larger diameter to enhance the power conversion efficiency of the photovoltaic cell, without providing a scattering layer, in order to reduce the production cost and the element complexity of the photovoltaic system. A manufacturing method for a photovoltaic system is also disclosed.

What is claimed is: 
     
         1 . A photovoltaic system, comprising:
 a waveguide body comprising a light incident surface and a first light emitting surface, wherein an external light is incident into the waveguide body through the light incident surface;   luminescent dyes aggregated into particulates dispersed in the waveguide body to transform a first light of the external light into a second light, wherein a wavelength of the second light is longer than a wavelength of the first light; and   a photovoltaic cell embedded within the first light emitting surface or disposed outside the first light emitting surface;   wherein the particulates are dispersed in the waveguide body to increase scattering of the first light not transformed by the luminescent dyes so as to increase a photon-to-electron conversion efficiency of the photovoltaic system.   
     
     
         2 . The photovoltaic system according to  claim 1 , wherein the waveguide body further comprises a second light emitting surface opposed to the light incident surface, and the second light emitting surface provides illumination with light transmitted through the second light emitting surface, wherein the first light emitting surface is connected between the light incident surface and the second light emitting surface. 
     
     
         3 . The photovoltaic system according to  claim 2 , wherein the particulates are close to the second light emitting surface. 
     
     
         4 . The photovoltaic system according to  claim 1 , wherein an average diameter of the particulates is between 1 and 80 microns. 
     
     
         5 . The photovoltaic system according to  claim 1 , wherein an average diameter of the particulates is between 20 and 30 microns. 
     
     
         6 . The photovoltaic system according to  claim 1 , wherein the luminescent dyes comprise at least one of 7-amino-4-methylcoumarin and disodium fluorescein. 
     
     
         7 . The photovoltaic system according to  claim 1 , wherein the waveguide body is flexible and comprises at least one of a thermoplastic elastomer and a photocurable polymer. 
     
     
         8 . The photovoltaic system according to  claim 1 , wherein the waveguide body comprises at least one of polystyrene, polycarbonate, polyurethane, cycloolefin copolymer, poly(ethylene terephthalate), poly methyl methacrylate, polyethylene terephthalate, styrene methyl methacrylate, styrene-ethylene/butylene-styrene, polyvinyl alcohol, polyvinyl pyrrolidone, and polydimethylsiloxane. 
     
     
         9 . The photovoltaic system according to  claim 1 , wherein the light incident surface comprises at least one curved surface. 
     
     
         10 . The photovoltaic system according to  claim 1 , wherein the waveguide body further comprises a microstructure, which is disposed at any surface of the waveguide body except for the light incident surface and the first light emitting surface. 
     
     
         11 . The photovoltaic system according to  claim 10 , wherein the microstructure is configured as a pyramid microstructure, a hemispherical microstructure, a rectangular microstructure, a roughened microstructure or a combination thereof. 
     
     
         12 . The photovoltaic system according to  claim 1 , wherein the light incident surface comprises a plurality of curved surfaces arranged in a matrix. 
     
     
         13 . The photovoltaic system according to  claim 1 , wherein the photovoltaic cell is encapsulated by the waveguide body.