Publication date: 15th December 2025
Achieving precise control over chiroptical response in nanocrystal assemblies remains a key challenge for advancing next-generation optoelectronic and photonic materials. While self-assembled colloidal systems, including magic-size clusters (MSCs) and semiconductor nanocrystals, can exhibit chiroptical activity, their optical rotation is typically obscured by circular dichroism and resonant absorption. Here, we present a precision nanochemistry strategy that leverages non-degenerate exciton coupling as a generalizable design principle for engineering pure optical rotation in bottom-up assemblies. Using modeling, we show that breaking energetic degeneracy between interacting chromophores enables strong circular birefringence in spectral regions where ellipticity and absorption are intrinsically minimized. We experimentally validate this concept using precision-synthesized colloidal CdS magic-sized clusters, whose controlled energy detuning (~150 meV) produces non-additive, off-resonant chiroptical behavior consistent with theory. Building on this foundation, we design a layered superstructure that maximizes chromophore interactions in an architecture accessible through colloidal assembly. Simulations predict dispersion-less optical rotation with high transmission and low ellipticity, performance previously limited only to lithographic metamaterials. This work introduces new synthetic and compositional parameters for designing nanocrystal-based chiral materials, enabling scalable fabrication of functional optical components from colloidal building blocks.
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.