Particle Size and Dispersity Control in High-Quality Mid-Wave Infrared HgSe Quantum Dots

Infrared HgSe quantum dots (QDs) enable mid-infrared and longer-wavelength infrared detection through intraband absorption, thereby expanding the selection range of traditional infrared detector materials, which holds promise for overcoming the challenges of complex fabrication processes and high costs. However, control of the size and distribution of HgSe QDs is a key factor limiting the performance enhancement of infrared detectors. Here, the reaction temperatures, growth periods, and reactant stoichiometries of the precursors were systematically regulated to achieve high-quality HgSe QDs with sizes ranging from 2.42 nm to 7.54 nm and excellent monodispersity. Further ligand exchange and film formation tests indicate that this HgSe QD film exhibits excellent flatness. Consequently, the high-quality mid-infrared HgSe QDs reported here are anticipated to facilitate subsequent advancements in associated domains.