A qualitative Design and optimization of CIGS-based Solar Cells with Sn2S3 Back Surface Field: A plan for achieving 21.83 % efficiency oleh Md. Ferdous Rahman, Md. Kamrul Hasan, Mithun Chowdhury, Md. Rasidul Islam, Md. Hafijur Rahman, Md. Atikur Rahman, Sheikh Rashel Al Ahmed, Abu Bakar Md. Ismail, Mongi Amami, M. Khalid Hossain, Gamil A.A.M. Al-Hazmi