Two-dimensional layered materials exhibit an endless array of exploitable chemical effects. These materials possess a series of layers zero to five bonds thick separated by van der Waals gaps, which can play host to intercalant guests providing a chemical route for optoelectronic tunability. Among 2D materials, one that offers the greatest promise for chemical and processing compatibility with silicon-based systems is silicon telluride (Si2Te3). Silicon telluride is a unique p-type semiconductor with a visible photoluminescence peak. In this talk, we report several synthesis techniques to grow high-quality single-crystals of 2D layered silicon telluride using colloidal and vapor-phase routes. We show that Si2Te3 can be grown in multiple morphologies as platelets, nanowires, and as colloidal nanoparticles. We show that the optoelectronic properties of silicon telluride can be chemically tuned through intercalation and doping. Chemical control of this 2D material offers much promise for the future of Si2Te3 as a silicon-based 2D chalcogenide.

Chemically tunable 2-dimensional layered silicon telluride, Si2Te3

255th National Meeting (2018)

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