Synthesis and Characterization of Selenides and Hybrid Halide Perovskites for Nanodevices

Semiconducting two-dimensional (2D) crystallites offer a rich playground to tune electronic and optoelectronic properties through synthesis routes. Here we discuss the synthesis of two such classes of 2D crystallites. The first is based on tungsten diselenide (WSe₂) which is synthesized using a chemical vapor deposition route through salt-assisted deposition. Besides these binary compositions of 2D layered materials, more complex material systems also exist that exhibit a form of van der Waals bonding in low-dimensionality hybrid organo-halides at their headgroups. Through this work, we delineate the synthesis and optical characterization of WSe₂ and 2D perovskites, where the latter has a composition specifically of ((CH₃(CH₂)₃NH₃)₂(CH₃NH₃)₃Pb₄I₁₃). Both such material systems are finding use as photoabsorbers in sensors and solar cells.