Texture and principle of operation of the antireflective layer. The Figure 1 presents the texture of the antireflective layer.įigure 1. Its choice must take into account its refractive index and its thickness which must adapt to the external and internal mediums of the cell. The antireflective layer improves optical confinement. For a smooth surface the considered beam is not recovered and turns over in the external environment. This reflected beam can meet another side of the antireflective layer and be transmitted. This is why it is preferentially used a process of texture which gives a surface in zigzag (pyramidal).With this morphology, the incidental light can be partly reflected. Indeed a smooth surface reflects more than other surface with a different morphology.
The specific property of this layer is its morphology. The antireflective layer has as a role to reduce in a remarkable way the reflection of the incidental light. However compared to the front reflection they generally use an antireflective layer. The performances of a solar cell depend not only on the internal factors, but also on the external factors such as the temperature of use -, the shade and the front reflection due to reflecting surfaces. Keywords: Antireflective Layer, Pyramidal Texture, Electrical Parameters, Cu(In, Ga) Se 2 The study of the variation of the electric parameters according to the combined effects of the angle and the depth of texture gives optimal performances for a texture angle of 70° and a texture depth of 21.875nm. The maximum absorption area extends on both sides of the visible wavelength range. The quantum efficiency in ultraviolet wavelength range is reduced by the increase in the angle of texture, while it increases the EQE in the near infrared range. The study of the influence of the angle of texture indicates an angle optimal of 70° which give a short-circuit current density of 0.3361mA.cm -2, an open circuit voltage of 0.8289V and a maximum power of 0.2375mW.
The studied macroscopic electric parameters are the short circuit current density Jsc, the open circuit voltage Voc, the maximum power Pm of the cell and the external quantum efficiency EQE. The morphology of the texture of surface can vary according to the angle formed by the edges of the pyramidal structure and according to the depth. Abstract: In this work a theoretical study on the behavior of the macroscopic physical parameters of the solar cell according to the texture of the front outer surface is conducted.
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