Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Indium phosphide quantum dots (QDs) have drawn attention as alternatives to heavy metal based QDs that are currently used for various opto-electronic applications. The main drawbacks of InP QDs are generally a lower photoluminescence quantum yield (PLQY), a decreased color purity and poor chemical stability. In this research, we attempted to increase the PLQY and stability of indium phosphide QDs by developing lattice matched In(Zn)P/MgSe core-shell nano-heterostructures. The choice of MgSe comes from the fact that, in theory, it has a near-perfect lattice match with InP, provided MgSe is grown in the zinc blende crystal structure. An improved lattice match should reduce interface states, which are centers for non-radiative recombination. In reality, MgSe crystalizes in the zinc blende structure only if alloyed with Zn, that is, forming ZnMgSe. Therefore, in order to test our hypothesis, we fabricated In(Zn)P/ZnMgSe core/shell nano-heterostructures and studied their structural and optical properties. These core/shell systems exhibited PLQYs higher than those of the starting In(Zn)P QDs and, more importantly, a higher color purity, which was maximized for shells having a high Mg content (x=0.3). The results are discussed in the context of a reduced density of interface states upon using better lattice matched ZnMgSe shells.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 766900 (Testing the large-scale limit of quantum mechanics).
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