Improvement of quantum efficiency using surface texture of solar cell in the form of pyramid

The work presented in this paper is concerned a detailed study about the light transmission through textured surfaces in a surface made up of pyramids 1, 2]. We investigate to what extent and under what conditions we want to take advantage of ray incidence five times and more 3, 4]. It is found that these analyses can be used to determine the optimal surface texture which provides the best light trapping for solar cells in terms of the total internal reflection occurring in the high-index medium at incidence angles larger than the nominal critical angle 5–11]. One of the main contributions of this paper is the analysis and quantification of the influence of the opening between the heads of the two closest pyramids in textured surface for solar cells and its application on the photovoltaic parameters such as the quantum efficiency. In this model we show that the material can have five and more successive incident ray absorptions instead of three currently, where we changed the direction of the reflected ray, by varying the angle between the two neighbouring pyramids, the incidence angle, the opening between the heads of the two closest pyramids and their height. Thus, with an angle between the two neighbouring pyramid varying between 20° and 12° and for angle of incidence varying between 80° and 84°. For these values of the angle between the two neighbouring pyramids and incidence angle, the opening between the heads of the two closest pyramids varied respectively from 3.53 to 2.10 µm for a pyramid height of 10 µm. This lead to a substantial increase of the quantum efficiency thus the photovoltaic efficiency.