Multijunction Solar Cell Substrate

A diffused photoactive junction in the germanium silicon substrate.

Multijunction solar cell substrate.

For the first time an efficiency of 25 9 percent has been achieved with a multi junction solar cell grown directly on a silicon substrate. The polyimide substrate serves as a permanent lightweight and flexible carrier for the thin multijunction solar cell for space applications. Multi junction mj solar cells are solar cells with multiple p n junctions made of different semiconductor materials each material s p n junction will produce electric current in response to different wavelengths of light the use of multiple semiconducting materials allows the absorbance of a broader range of wavelengths improving the cell s sunlight to electrical energy conversion efficiency. A solar cell comprising a bulk germanium silicon growth substrate.

The maximum theoretical efficiency that a single bandgap solar cell can achieve with non concentrated sunlight is about 33 5 primarily because of. High efficiency multijunction devices use multiple bandgaps or junctions that are tuned to absorb a specific region of the solar spectrum to create solar cells having record efficiencies over 45. And a sequence of subcells grown over the substrate with the first grown subcell either being lattice matched or. The thin epi layer is transferred to the polyimide wafer.

The polyimide substrate has the advantage of thermal dimensional stability at high temperatures. Multijunction solar cells on bulk gesi substrate mar 13 2020 solaero technologies corp.