Publication date: 17th July 2025
Indium arsenide (InAs) quantum dots (QDs) emerged recently as promising greener alternatives to lead- and mercury-based chalcogenide infrared QDs. Advances in synthesis have made it possible to produce stable InAs QDs with improved luminescence properties and applications in light emitting and light harvesting devices. Despite the progress, many aspects of the fundamental electronic properties of such QDs, especially in the form of thin films are still elusive.
In this work, we employ variable-temperature, steady-state and transient photoluminescence (PL) measurements to study the photophysics of drop-casted films of InAs core and InAs/ZnS, InAs/ZnSe core/shell QDs. Shell growth improves the passivation of deep surface traps, leading to up to an order-of-magnitude increase in PL quantum yield and up to a threefold extension of the PL lifetime. On the other hand, shallow surface traps appear to mediate thermally activated exciton trapping and de-trapping processes, giving rise to a non-monotonic temperature dependence of both the PL intensity and the PL lifetime. Modelling of the results suggests that the average depth of such shallow traps increases upon shell formation, possibly due to emergence of interfacial core–shell trap states. The work provides some initial insight into the excitonic and defect-level structure of colloidal InAs QD-based solids.
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.