Heterojunction technology (HJT) is another type of putting thin layers of solar cells into a new structure to produce solar cells. This is for being able to absorb a wide spectrum of sunlight.
How is HJT structured?
HJT solar cell is comprised of three layers. It is has gathered two different generations of solar cell manufacturing into one single cell. A solar cell based on HJT is made when a crystalline silicon solar cell sandwiched between two layers of “amorphous silicon (a-Si)” solar cells. Most of the common types of solar cells are made of crystalline silicon.
What are a-Si Cells?
The a-Si solar cell does not have a regular structure. This type of solar cell is less efficient than conventional crystalline silicon at converting sunlight into electricity, but it can harness that part of the “sunlight spectrum” which crystalline silicon “can NOT absorb” to generate electricity. Moreover, it has also lower production costs.
Therefore, HJT solar cell that has a-Si in its front and back is more efficient because amorphous layers absorb the extra photons that could not be captured by the middle crystalline silicon layer.
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