1. Department of Industrial Chemistry, Addis Ababa Science and Technology University, P.O. Box 16417 Addis Ababa, Ethiopia
2. Sustainable Energy Center of Excellence, Addis Ababa Science and Technology University, P.O.
Box 16417 Addis Ababa, Ethiopia
3. Linz Institute for Organic Solar Cells (LIOS)/Institute of Physical Chemistry, Johannes Kepler University, Linz, Altenberger Str. 69, 4040 Linz, Austria
4. Department of Chemistry, Hawassa University, P.O. Box 05 Hawassa, Ethiopia
5. Division of Soft Matter Physics and LIT Soft Materials Lab, Johannes Kepler University, Linz, Altenberger Str. 69, 4040 Linz, Austria
6. Department of Chemistry, Addis Ababa University, P.O. Box 1176 Addis Ababa, Ethiopia