Selenization of V${}_2$O${}_5$/WO${}_3$ Bilayers for Tuned Optoelectronic Response of WSe${}_2$ Films

Scalable and controlled doping of two-dimensional transition metal dichalcogenides is essential for tuning their electronic and optoelectronic properties. In this work, we demonstrate a robust approach for substitution of vanadium in tungsten diselenide (WSe${}_2$) via the selenization of pre-deposited V${}_2$O${}_5$/WO${}_3$ thin films. By adjusting the thickness of the vanadium oxide layer, the V concentration in W${}_{1-x}$V${}_x$Se${}_2$ is systematically varied. Electrical measurements on field-effect transistors reveal a substantial enhancement in hole conduction, with drain current increasing by nearly three orders of magnitude compared to undoped WSe${}_2$. Temperature-dependent electrical resistivity indicates a clear insulator-to-metal transition with increasing V content, likely due to band structure modifications. Concurrently, the photoconductive gain decreases, suggesting enhanced recombination and charge screening effects. These results establish vanadium doping via selenization of V${}_2$O${}_5$/WO${}_3$ films as a scalable strategy for modulating the transport and photoresponse of WSe${}_2$, offering promising implications for wafer-scale optoelectronic device integration.