Ojo A.O., Adedokun K.A., Gbadero D.S., Oyetunji E.O., Adegboyega O., Egbeyale G.B., Ajani A.S., Awodele M.K. & Adedokun O.
Vol 9, Issue 1, Article number: 33 (Mar, 2025)
Abstract
Dye-sensitized solar cells (DSSCs) offer a compelling alternative to conventional silicon-based solar cells due to their cost-effectiveness, flexibility, and relatively high efficiency. However, their performance is currently hindered by the photoanode material, typically titanium dioxide (TiO₂). This research investigates tin dioxide (SnO₂) nanoparticles as a promising substitute for TiO₂. To further enhance photoelectrochemical performance, biomass-derived graphene, prepared from the shoot of Bryophyllum Pinnatum was integrated into the SnO₂ nanoparticle matrix. This study focuses on developing a green synthesis method for SnO₂ nanoparticles utilizing Bryophyllum Pinnatum extract and subsequently fabricating a graphene/SnO₂ nanocomposite (G/SnO₂ NC) for potential application in DSSCs. Characterization techniques, including UV-Vis spectroscopy, XRD, SEM, and EDX, were employed to analyze the structural, morphological, and optical properties of graphene, SnO₂, and the G/SnO₂ NC. The photoanode thin films were deposited using the doctor blade technique, and their electrical properties were evaluated using four-point probe measurements. Results demonstrate that the G/SnO₂ NC exhibits significantly enhanced electrical conductivity (0.148 S/m) compared to pristine SnO₂ (0.098 S/m) and graphene (0.122 S/m), indicating improved charge transport properties within the composite material. This enhancement is attributed to the synergistic effect of the high electron mobility of SnO₂ and the excellent conductivity of graphene. Furthermore, the G/SnO₂ NC exhibits lower sheet resistance (549.48 Ω), further supporting its potential for efficient charge collection in DSSC applications. This study presents a novel, eco-friendly approach to synthesizing and integrating a high-performance photoanode material for DSSCs, paving the way for more sustainable and efficient solar energy conversion technologies.