Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.126
Publication date: 18th December 2023
Colloidal infrared (IR) quantum dots (QDs) have been studied with many advantages, such as tunable absorption and fluorescence emission spectra, high molar extinction coefficients, high photoluminescence (PL) quantum yield, high stability, cost-efficient and scalable synthesis, and solution processability. Most of the reported IR-active QDs are based on materials containing toxic heavy metals, such as PbS and HgTe QDs. III- V semiconductors containing one group-13 and one group-15 element of the periodic table are highly promising Pb- and Hg-free alternative materials.[1] Colloidal InSb QDs have been considered as a low-toxic alternative to Pb or Hg chalcogenide QDs. The InSb has a large excitonic Bohr radius of ~60 nm, and it allows the band gap of InSb QDs to be widely tuned in the IR spectral range through size control. However, only a few chemical synthesis methods have been reported due to the limited precursors and the synthesized InSb QDs have featureless or broad excitonic absorption peaks showing extremely broad size distribution so far.
Here, we report the chemical synthesis and surface engineering of colloidal InSb QDs. In the synthesis part, various synthesis parameters such as precursors, temperature, time, and an introduction of additional ions are explored to produce InSb QDs with unprecedented optical quality. The optical properties of InSb QDs are studied mainly based on the wavelength and the width of the excitonic absorption features. We demonstrate full tunability of the first excitonic absorption peak in the IR range from 700 to 2000 nm and narrow line widths by virtue of an improved size homogeneity of the InSb QDs. The effect of each synthesis parameter on the optical properties of InSb QDs and their growth mechanism will be discussed. In the surface engineering part, the surface ligands of InSb QDs are altered from the original long-chain organic ligands to short-chain ligands to afford conductive InSb QDs films. Several ligands were tested and their optical/structural properties of InSb QDs were compared before and after surface modification. With the thus optimized experimental conditions, we obtain InSb QDs films with high stability, high conductivity, and suitable band energy levels for application as environmentally benign IR photodetectors.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.