Defaru Negera, and Teketel Yohannes. 2018. “Hansen Solubility Parameters and Green Solvents for Organic Photovoltaics”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 4 (10):119-28. https://doi.org/10.31695/IJASRE.2018.32842.