Abstract
The ongoing effort to stabilize and enhance dye-sensitized solar cells (DSSCs) efficiency has prompted the solar society to adopt innovative strategies. The counter electrode (CE) plays a crucial role, with platinum (Pt) being effective but expensive. Transition metal dichalcogenides (TMDs) like Tin sulphide (SnS2) show promise as alternatives to Pt. In this work, Tantalum (Ta)-doped SnS2 hexagonal nanoflakes have been synthesized by the hydrothermal method. Characterization using X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS) revealed the impact of dopants on these nanoflakes. XRD, Raman, and HRTEM confirmed the hexagonal structure of nanoflakes. Electrochemical impedance spectroscopy (EIS) indicated a reduced charge transfer resistance (Rct) value of 1.51 Ω. Cyclic voltammetry (CV) analyses confirmed the improved electrocatalytic activity and superior redox reaction. Therefore, Ta dopant SnS2-based CE offers cost-effective and enhanced power conversion efficiency (PCE) in DSSC.
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