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Question:

What is the window material in the solar cell? what's the effect?

What is the window material in the solar cell? what's the effect?

Answer:

The meaning of the window layer with his Chinese meaning is the same, referring to the first solar cells to accept the light.
The general window layer to play with the battery body layer to form the role of electric field within the pn junction, if the battery body layer is N-type, the window is p-type, and vice versa.
However, since the window layer is a surface layer, the surface composite is serious, so the window layer to avoid absorbing light to produce carriers, so the window layer is generally made of large band gap material, try not to absorb light.
Because the window layer near the surface, the defect is very much, if the absorption of light generated photogenerated carriers, then it is easy to die, do not contribute to the battery output, the absorption of light are wasted, reducing battery efficiency.

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