NOVELTY - The solar energy module (1000) comprises a substrate (100) comprising a light diffusion layer (10) and light guiding layers (20, 30, 40) adjacent to the light diffusion layer, and solar chips (70) disposed on lateral surfaces of the substrate. The substrate has a transparency of 5-85%. The solar light enters the substrate, and is diffused by the light diffusion layer. The diffused solar light is reflected by an interface of the light diffusion layer and the light guiding layer to be collected by the solar chips. A part of the solar light enters the light guiding layers.    USE - The solar energy module is useful in roofs, outer walls or windows of houses or buildings.    ADVANTAGE - The solar energy module has improved collection efficiency and transparency.    DETAILED DESCRIPTION - The solar energy module (1000) comprises a substrate (100) comprising a light diffusion layer (10) and light guiding layers (20, 30, 40) adjacent to the light diffusion layer, and solar chips (70) disposed on lateral surfaces of the substrate. The substrate has a transparency of 5-85%. The solar light enters the substrate, and is diffused by the light diffusion layer. The diffused solar light is reflected by an interface of the light diffusion layer and the light guiding layer to be collected by the solar chips. A part of the solar light enters the light guiding layers, and is reflected by the interface of the light guiding layers, where the reflected light is collected by the solar chips. The light diffusion layer comprises light scattering particles, and a mixed material of two materials with different index of refractions, and is an optical composite structure. A heat insulation layer is formed on a surface of the substrate opposite to the surface of the substrate through which solar light enters the substrate. The heat insulation layer has high reflective rate for solar light. The solar chips comprise III-V column solar chips, single crystal silicon solar chips, poly crystal silicon solar chips or copper indium gallium diselenide solar chips. Reflective layers are formed on the lateral surfaces of the substrate on which no solar chips are disposed.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a solar energy module.    Light diffusion layer (10)    Light guiding layers (20, 30, 40)    Solar chips (70)    Substrate (100)    Solar energy module. (1000)