Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
This work presents a detailed study of GaSb quantum dot (QD) epitaxy on (001) GaP substrates by means of molecular beam epitaxy. Despite the large mismatch between GaP and GaSb, we show that in the nucleation-diffusion regime, the QD size distribution follows the predictions of the scaling theory. Scanning transmission electron microscopy analysis of grown QDs reveal that they are plastically relaxed by 60° pairs of misfit dislocations and the valence band offset measured by x-ray photoelectron spectroscopy on such QDs amounts to 0.5 eV. After capping, the QD morphology is strongly modified with a large P/Sb exchange-segregation reaction, which even leads to the formation of core-shell nanostructures. Remarkably the resulting QD layer is coherent to the substrate without any remaining misfit dislocation and exhibits still strong composition modulations.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1088/1361-6528/aa6f41 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Pressure-Driven Structural and Optoelectronic Tuning of Cl-Substituted 2D Lead Halide Perovskite (ClPMA)PbI.
J Phys Chem Lett
September 2025
Department of Earth System Sciences, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
We present a systematic high-pressure investigation of the chlorine-functionalized two-dimensional hybrid perovskite (ClPMA)PbI, integrating high-pressure synchrotron powder X-ray diffraction (HP-PXRD), photoluminescence spectroscopy (HP-PL), and first-principles density functional theory (DFT) calculations. Under hydrostatic compression up to 6.18 (±0.
View Article and Find Full Text PDFBonding-Guided Anisotropic Growth of Quasi-1D MXSe Thermoelectric Nanowires.
Small
September 2025
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
Quasi-1D van der Waals materials have emerged as promising candidates for flexible electronic and thermoelectric applications due to their intrinsic anisotropy, narrow band gaps, and mechanical flexibility. Herein, MXSe (M = Nb, Ta, X = Pd, Pt) nanowires are studied to understand the bonding-directed growth mechanism. Bond valence sums and binding energy analyses reveal that weak X2-Se2 interactions perpendicular to the c-axis facilitate anisotropic growth.
View Article and Find Full Text PDFKCuS: A Layered Inorganic Chalcogenide Semiconductor as a Promising Light Absorber.
Inorg Chem
September 2025
Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India.
A potential replacement that alleviates the shortcomings of the dominant light absorber materials used in solar photovoltaics has been synthesized, and its microstructural, electronic structure, and optical properties have been investigated. KCuS crystals were synthesized by the carbonate method. Transmission electron microscopy (TEM) established [010] as the growth direction of the needle-like monoclinic crystals.
View Article and Find Full Text PDFAtomic-Scale Electric Potential Landscape across Molecularly Gated Bilayer MoS Resolved by Photoemission.
ACS Nano
September 2025
Insitut für Physik and Center for the Science of Materials Berlin, Humboldt-Universität zu Berlin, Berlin 12489, Germany.
Electric gating in atomically thin field-effect devices based on transition-metal dichalcogenides has recently been employed to manipulate their excitonic states, even producing exotic phases of matter, such as an excitonic insulator or Bose-Einstein condensate. Here, we mimic the electric gating effect of a bilayer-MoS on graphite by charge transfer induced by the adsorption of molecular p- and n-type dopants. The electric fields produced are evaluated from the electronic energy-level realignment and Stark splitting determined by X-ray and UV photoelectron spectroscopy measurements and compare very well with literature values obtained by optical spectroscopy for similar systems.
View Article and Find Full Text PDFA CuBiO/TiO p-n Heterojunction for Enhancing the Barrier Protection of a Nickel-Based Layer on the Magnesium Alloy.
J Phys Chem Lett
September 2025
Precise Synthesis and Function Development Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, PR China.
Herein, CuBiO microspheres were first deposited on TiO nanotube arrays to develop a p-n CuBiO/TiO heterojunction by a facile hydrothermal protocol. The variations in the photoinduced open-circuit potential, photocurrent, and electrochemical parameters of the nickel-plated magnesium alloy (Mg/Ni) demonstrated the remarkably strengthened photoelectrochemical efficiency and photocathodic protection (PCP) capability caused by the CuBiO modification. This enhancement is attributed to establishing a built-in electric field and intensified light absorption in a broadened wavelength spectrum, confirmed by the valence band XPS and ultraviolet-visible spectra.
View Article and Find Full Text PDF