Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.353
Publication date: 16th December 2024
Advances in the synthesis of III-V quantum dots, including InP and InAs, have led to their development for current- and next-generation solid-state lighting, wide color gamut displays, and infrared optoelectronics. The most widely adopted synthesis of these III-V quantum dots involves indium carboxylates and E(SiMe3)3 (E = P, As) and is understood to proceed through the formation of metastable, atomically-precise intermediates that are often referred to as clusters. In this work, we investigate the synthesis and growth pathways of III-V clusters to draw conclusions about kinetic differences in their formation. Along with synthetic experimentation, we analyze the single-crystal X-ray diffraction structures of some of the reported intermediates including In37P20(O2CR)51, In26P13(O2CR)39, and In26As18(O2CR)24(PR’3)3.[1],[2] The structural similarities between these materials and other II-VI materials of similar morphology have strong implications for understanding the landscape of accessible binary semiconductor clusters. Modifying these structures through the introduction of dopants has allowed for the formation of desirable, complex compositions including manganese, cobalt, and molybdenum. We find that the addition of L-type amine modifies the surface of these materials and leads to an amorphous single-source precursor primed for the formation of doped-InP nanomaterials. Expanding the library of cations in conjunction with exploring the basicity of the dopant-assisting L-type ligand could lead to alloys that are difficult to achieve with more conventional colloidal techniques.
This work was supported by the National Science Foundation under grant CHE-2107237. The theoretical modeling was supported through collaboration with the UW Molecular Engineering Materials Center (MEM-C) under grant DMR-2308979. Part of this work was conducted at the Washington Nanofabrication Facility/Molecular Analysis Facility, a National Nanotechnology Coordinated Infrastructure (NNCI) site at the University of Washington with partial support from the National Science Foundation via awards NNCI-1542101 and NNCI-2025489. NMR characterization was supported via NIH S10 OD030224-01A1.
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