List of Articles Open circuit voltage Open Access Article Abstract Page Full-Text 1 - Effects of Effective Layer Thickness, Light Intensity and Electron-Hole Pair Separation Distance on The Performance of Organic Bulk Heterojunction Solar Cells Aliasghar Ayobi 10.30495/jopn.2024.32692.1305 Open Access Article Abstract Page Full-Text 2 - Efficiency Improvement of InGaP/SiGe tandem solar cell using Si0.18Ge0.82 graded buffer regions Mojtaba Shahraki Majid Ghadrdan 10.30495/jopn.2024.33226.1313