List of Articles Majid Ghadrdan Article 1 - Efficiency Improvement of InGaP/SiGe tandem solar cell using Si0.18Ge0.82 graded buffer regions 10.30495/jopn.2024.33226.1313 Mojtaba Shahraki Majid Ghadrdan Journal of Optoelectronical Nanostructures , Issue 34 , Year , Autumn 2024