Theoretical Study of Carrier Concentration Impact on the Photocurrent and Efficiency of RuTH–TiO2 DSSCs
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Abstract
In this work, we study and calculate the efficiency of RuTH dye-contact TiO₂ semiconductor-based dye-sensitized solar cells (DSSCs) using quantum charge transport. We studied and evaluated the impact of flow current density, based on interface reorganization energy, force coupling, atomic density, effective path length and the concentration and polarity of both RuTH and TiO2 dyes, on the charge-transport process. We discussed and analyzed the influence of strong coupling and concentration on flow current density in RuTH-TiO2 devices, as reflected in the electronic transfer results. The results show that flow current density is strongly affected by concentration and strength coupling, which determine the efficiency of RuTH-TiO2 devices. The efficiency, influenced by the increased carrier concentration of TiO2, plays a significant role in the increased flow of current in the charge transport reaction and limits the electrical properties of RuTH-TiO₂ devices. Specifically, the strength of the coupling between the RuTH dye and TiO₂ affects electron transport. It plays a key role in modulating current density and efficiency; stronger coupling increases electron transport, and vice versa. Additionally, increasing the concentration from (2×10¹⁸ cm⁻³) to (4×10¹⁸ cm⁻³) is favorable and increases efficiency from (4.543 %) to (9.227 %); this suggests that RuTH dye is a suitable contact for TiO2-based DSSC devices.
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