Effect of potash alum nano on the efficiency of the photovoltaic cell Taghreed N. Jamil, Ali J. Khalaf, Narimann Neamah Hussein and Ali Abid Abojassim E3S Web Conf., 592 (2024) 01002 Published online: 20 November 2024 DOI: 10.1051/e3sconf/202459201002