Question

What is the main problem of a solar cell made of a single layer pure or pristine

Answer 1

A solar cell or photovoltaic cell is an electrical device that converts the energy of light directly into electricity.

       Multiple solar cells in an integrated group all oriented in one plane, constitute a solar photovoltaic panel or module or simply solar panel.

The main problems of single layered pure solar cells are

1 :Cost of processing

The method, which is used to manufacture the mono crystalline pure solar panel cells,needs a lot of energy. Since single crystal needs to pure in order for its crystalline structure to be highly uniform, a lot of processing needs to bring it to that level .Extremely precise control and balance is required in order to generate that has mono crystalline layer all throughout.

2 .Problems with absorption:

A general structure of the solar panel includes a glass on top for protection from wind, the photovoltaic cell with anti-reflective coating in the middle with a metal to support at the bottom. Each layer in the cells is characterized by a complex refractive index (N = n-ik), where n is real refractive index of material and k is the extinction coefficient. The absorption factor of the solar cells (α) is equals: α = 4πk/λ. However, according to this equation, as the wavelength of photons increases, the absorption coefficient decreases .Photons with short wavelength (λ<1.0) have an energy larger than the band gap, which allows it to generate electron–hole pairs and is readily absorbed by the crystalline . This wavelength of light/photons usually includes the infrared spectrum. However, long-wavelength photons (λ>1.2 μm) cannot generate electron-hole pairs and are hardly absorbed. Photons in the transition region of (1.2μm<λ<1.0μm) are weakly absorbed. This means, light with higher wavelength (λ>1.2μm), is not utilized by the solar cell.