Optical design of inverted pyramid textured PERC solar cells

Single-side optical design of solar cells has limitations. In this paper, we studied the optical properties of inverted pyramid textured passivated emitter and rear cell (PERC) solar cells, considering different combinations of front and rear inverted pyramid angles. Ray tracing simulations were conducted to obtain a macro insight, and then, experiments were performed under the conditions of practical applications. According to an analysis of the results, the overall optical properties are shown to be positively correlated with the front side inverted pyramid angle and the influence of the rear side inverted pyramid angle strongly depends on the front side inverted pyramid angle. In practical applications, double-sided inverted pyramids with an angle of 54.74 degrees can be efficiently fabricated on silicon wafers etched by the metal catalysis chemical etching (MCCE) method. Maintaining the front surface morphology as etched, wafers with small angle (10 to 20 degrees) inverted pyramids at the rear side ha...