LAUSR

The synthesis of colloidal III-V quantum dots (QDs), particularly of the arsenides and antimonides, has been limited by the lack of stable and available group V precursors. In this work, we exploit accessible InCl3- and pnictogen chloride-oleylamine as precursors to synthesize III-V QDs. Through co-reduction reactions of the precursors, we achieve size and stoichiometry-tunable, binary InAs and InSb as well as ternary alloy InAs1-xSbx QDs. Based on structural, analytical, optical, and electrical characterization of the QDs and their thin-film assemblies, we study the effects of alloying on their particle formation and optoelectronic properties. We introduce a hydrazine-free hybrid ligand exchange process to improve carrier transport in III-V QD thin films and realize InAs QD field-effect transistors with electron mobility >5 cm2/(Vs). We demonstrate that III-V QD thin films are promising candidate mate-rials for infrared devices and show InAs1-xSbx QD photoconductors with superior short-wavelength infrared (SWIR) photoresponse than those of the binary QD devices.