“Two dimensional grating and efficiency enhancement of Si photovoltaic cells by surface texturing using UV femtosecond laser pulses”, IJP, vol. 9, no. 15, pp. 1–7, Oct. 2011, Accessed: May 19, 2024. [Online]. Available: https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/794