Publications by authors named "I C Infante"
Quantum dots (QDs) are semiconductor nanocrystals whose optical properties can be tuned by altering their size. By combining QDs with dyes we can make hybrid QD-dye systems exhibiting energy transfer (ET) between QDs and dyes, which is important in sensing and lighting applications. In conventional QDs that need a shell to passivate surface defects, ET usually proceeds through Förster resonance energy transfer (FRET) that requires significant spectral overlap between QD emission and dye absorbance, as well as large oscillator strengths of those transitions.
View Article and Find Full Text PDFThe effectiveness of nanocrystals in many applications depends on their surface chemistry. Here, we leverage the atomically precise nature of zirconium and hafnium oxo clusters to gain fundamental insight into the thermodynamics of ligand binding. Through a combination of theoretical calculations and experimental spectroscopic techniques, we determine the interaction between the MO (M = Zr, Hf) cluster surface and various ligands: carboxylates, phosphonates, dialkylphosphinates, and monosubstituted phosphinates.
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- The researchers synthesized nanocrystal heterostructures combining CsPbCl and PbS domains with a shared interface, utilizing Mn ions to suppress the unwanted PbSCl growth.
- They achieved full suppression of the PbSCl by using a specific sulfur source and adjusting the reaction temperature, leading to a type-I band alignment where only PbS emitted light.
- The team also explored the potential for creating second-generation heterostructures through selective ion exchanges, showcasing successful exchanges of Cl for Br and Pb for Cu, resulting in new epitaxial heterostructures.
Article Synopsis
- Current syntheses of CsPbBr halide perovskite nanocrystals often use too much lead, leading to leftover lead ions.
- The study explored replacing excess lead with various metal cations, resulting in two types of products: one type with high-quality monodisperse cubes and another with irregular shapes.
- Adding a specific ammonium cation during the synthesis reshaped the nanocrystals to more uniform forms while maintaining high photoluminescence yields, although this reshaping is temporary.
In the quest for thinner and more efficient ferroelectric devices, HfZrO (HZO) has emerged as a potential ultrathin and lead-free ferroelectric material. Indeed, when deposited on a TiN electrode, 1-25 nm thick HZO exhibits excellent ferroelectricity capability, allowing the prospective miniaturization of capacitors and transistor devices. To investigate the origin of ferroelectricity in HZO thin films, we conducted a far-infrared (FIR) spectroscopic study on 5 HZO films with thicknesses ranging from 10 to 52 nm, both within and out of the ferroelectric thickness range where ferroelectric properties are observed.
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