Drift-Diffusion modelling of ZnSe-TiO ₂ based Photoanode for Bifacial Dye Sensitized Solar Cells

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Chinese explanation / 中文解读

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Original abstract

Abstract A comprehensive drift-diffusion simulation study was conducted to optimise ZnSe-TiO 2 composite photoanodes for bifacial dye-sensitised solar cells (DSSCs) using the Solar Cell Capacitance Simulation platform. Key physical and electronic parameters, including photoanode thickness, Density of states, defect density, temperature, and contact resistances, were systematically varied to unravel their effects on photon harvesting and charge transport. Spectral analyses of all device layers demonstrated significant enhancements in visible-light absorption and charge-separation capabilities compared to conventional TiO 2 photoanodes. Comparative device performance metrics revealed that the ZnSe-TiO 2 heterostructure delivered notable efficiency improvements under both Front (3.26%) and back (2.68%) illumination, reflecting pronounced gains in carrier mobility and recombination suppression. The simulation uncovers how engineered band alignment, defect passivation, and optimised interfacial design collectively advance bifacial operation and rear-side efficiency, which are critical for next-generation photovoltaic applications.These results provide a robust theoretical blueprint for the experimental realisation of highefficiency, bifacial DSSCs employing advanced composite photoanodes and suggest promising routes for further material development in semi-transparent and building-integrated solar energy systems.

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