5.2. Surface texturing
This method is also used for reducing the reflection. This is done by making the surface rough or by etching the surface [5] and [37]. When light falls on textured surface, the chances of reflection gets reduced and it bounces back to the surface. Random and textured surfaces are more effective than flat surface and some particular textured geometry; like, inverted, pyramidal, upright and random textures is more effective [38]. All these geometrical textured surfaces are not suitable for all types of materials. These can be applied to some particular type of solar cell [39] and [40]. Generally, geometrical scale textures are less suitable for thin film solar cell because of low thickness of thin film solar cell. This result in smaller absorption i.e. large loss and also increases the minority carrier recombination. Textured surface on thin film solar cell is shown in Fig. 7[41].