Notch structure for concentrating module and method of manufacture using photovoltaic strips
View Patent ↗The invention provides a solar concentrator structure including a first concentrating element. The first concentrating element includes a first aperture region, a first exit region, a first side and a second side. The solar concentrator structure further includes a second or more concentrating elements integrally coupled with the first concentrating element in a parallel manner. The second concentrating element includes a second aperture region, a second exit region, the third side, and a fourth side. The third side joins with the second side to form an apex notch structure characterized by a radius of curvature. Additionally, the solar concentrator structure includes a separation region by a width separating the first exit region from the second exit region and a triangular region including the apex notch structure and a base defined by the separation region and a refractive index of about 1 characterizing the triangular region.
1. A solar module with light concentrator structure for photovoltaic strips, the solar module comprising:
a front cover member including a webbing with a flat front plane, a back plane, a first thickness provided between the front plane and the back plane, a plurality of concentrating elements integrally formed in a parallel manner extending from a first edge to a second edge, and a peripheral region, each of the plurality of concentrating elements including an aperture region, an exit region, a second thickness provided between the aperture region and the exit region, and two sides connecting the aperture region and the exit region;
a plurality of triangular notches separating each of the plurality of concentrating elements from its neighbor one, each of the plurality of triangular notches including an apex region;
a first radius of curvature of 0.10 mm to 0.005 mm characterizing the apex region;
a first refractive index of about 1.45 or higher characterizing the webbing with the plurality of concentrating elements;
an optical coupling material applied overlying all exit regions of the plurality of concentrating elements;
a plurality of photovoltaic strips bonded to all exit regions via the optical coupling material;
a plurality of triangular shaped regions including the corresponding plurality of triangular notches; and
a second refractive index of about 1 characterizing the plurality of triangular regions,
wherein the first thickness ranges from 5 to 7 mm.
2. The solar module of claim 1 wherein the first cover member is a single piece of transparent solid characterized by a refractive index of 1.4 or larger and a transmissivity of 90% or higher; and further comprising a back cover member.
3. The solar module of claim 1 wherein the single piece of transparent solid is glass, polymeric material, or plastic material.
4. The solar module of claim 1 wherein each of the plurality of concentrating elements comprises a truncated pyramid shape with the two sides extended in a spatial direction which is in parallel with the first edge and the second edge.
5. The solar module of claim 1 wherein the peripheral region comprises a lateral dimension of about 10 mm and is free from any concentrating elements.
6. The solar module of claim 1 wherein each of the plurality of concentrating elements is characterized by an aperture region/exit region ratio of 2.0 or larger.
7. The solar module of claim 1 wherein the first radius of curvature of the apex region effectively reduces an efficiency of the plurality of concentrating elements by about 5% and less by reducing effective aperture region.
8. The solar module of claim 1 wherein the plurality of photovoltaic strips are made of at least one material selected from single crystal silicon, polycrystalline silicon, amorphous silicon, copper indium diselenide (CIS), Copper Indium Gallium Selenide (CIGS), Cadmium Telluride (CdTe), thin film materials, or nanostructure materials.
9. The solar module of claim 1 wherein the plurality of triangular shaped regions including the corresponding plurality of triangular notches is a cavity.
10. The solar module of claim 1 wherein the peripheral region is free from concentrating elements.