Perceiving of Defect Tolerance in Perovskite Absorber Layer for Efficient Perovskite Solar Cell oleh Samiya Mahjabin, Md. Mahfuzul Haque, K. Sobayel, M. S. Jamal, M. A. Islam, V. Selvanathan, Abdulaziz K. Assaifan, Hamad F. Alharbi, K. Sopian, N. Amin, Md. Akhtaruzzaman