Journal of Theoretical and Applied Physics (JTAP) Theoretical calculation of the electronic current density in ruthenium 620 contact with TiO2 semiconductor in propanol solvent Volume 18 (2024) Special Issue-AICIS’23 2024 07 26 Theoretical calculation of the electronic current density in ruthenium 620 contact with TiO2 semiconductor in propanol solvent 10.57647/j.jtap.2024.si-AICIS23.18 EN Hadi J. M. Al-Agealy Department of Physics, College of Education for Pure Science -Ibn Al-Haitham, University of Baghdad, Baghdad, Iraq Hazim Hadi Dhayef Al-Hasan Ministry of Education, General Directorate of Wasit Education, Iraq Raafat Abdul Hassan Muslim Center of Education, Researches-studies, Ministry of Education, Iraq Mohsin A. Hassooni Department of Physics, College of Education for Pure Science -Ibn Al-Haitham, University of Baghdad, Baghdad, Iraq Journal Article 2024 07 26 In this study, a theoretical model was presented to calculate current and current density to investigate the efficiency of the heterogeneous ruthenium 620-TiO2  device using a propanol solvent. This work examines the effect of concentration carriers on the current density and performance of ruthenium 620-TiO2 devices for dye-sensitized solar cells (DSSCs) in the presence of a propanol solvent based on electron transfer theory. Quantum electron transfer theory is used to describe current cross-linked 620-TiO2 ruthenium devices. When the concentration is increased from 1.5×1024 m−3 to 2.5×1024 m−3, the current density and current show a significant shift to an increase of approximately 1.66. The fill factor does not change significantly, but there are efficiency shifts of about 1.004 with increasing concentration carrier taken from the experimental literature from 1.5×1024 m−3 to 2.5×1024 m−3.