City University of Hong Kong
Prof. Andrey Rogach | CityUHK
City University of Hong Kong
Prof. Andrey Rogach | CityUHK

Our Current Research

From cutting-edge perovskite spin-LEDs and highly efficient HgTe photodetectors to dual-atom catalysts for O2 evolution reaction—our research is a blend of materials science, photonics, and nanofabrication. Click on a link below to read about one of our feature topics.

Perovskites for Displays
Carbon Dots
Chiral Nano- and Microstructures
Infrared HgTe Nanocrystals
Photo- and Electrocatalysis
TOC figure from Desui Chen's article on spin LEDs
TOC figure from Desui Chen's article on ultralow trap density FAPbBr3 perovskite films

Our group's major focus is on the synthesis and modification of perovskite nanocrystals and thin films, particularly for lighting and display applications. We aim to improve the efficiency and stability of our devices and tune their emission in a broad wavelength range including the NIR. By utilizing chiral ligands, we prepare nanocrystals with circularly-polarized emission to fabricate advanced spin-LEDs.

Read our recent works on perovskite LEDs:

Non-carbonized carbon dots derived from citric acid and ethylenediamine form dynamic assemblies containing fluorophore-rich IPCA domains
Fluorescence of carbon dots under UV excitation

Commonly known under the term "carbon dots", this diverse family of fluorescent carbon nanoparticles can be used in a wide range of applications, from biomedicine to solar energy harvesting. In our group, we try to find new synthetic routes to improve the properties of carbon dots and explore their usability in sensing, optoelectronics, and related fields.

Read our recent works on carbon dots:

TOC image from Qi Wei's paper on long-lived spin coherence in perovsite quantum wells
TOC image from Haochen Liu's paper on helical perovskite nanowires assembled from red-emitting quantum dots

Our research group investigates chirality in nano- and microstructures, focusing on material's shape and molecular design to control light–matter interactions. We develop ligand exchange strategies and structural modifications to induce circular dichroism and circularly polarized photoluminescence in colloidal nanocrystals and solid films. Through these approaches, we open ways toward advanced optolectronic materials with specific spin and light polarization properties.

Read our recent works on chirality:

Schematic of low-temperature chemical bath deposition method to grow a heterojunction passivation layer on HgTe quantum dot photoactive layers for detector fabrication
TOC image from the paper by Dr. Kseniia A. Sergeeva on HgTe nanocrystals for infrared LEDs published in ACS Nano in March 2026

Our research group is at the forefront of developing infrared optoelectronic devices based on HgTe nanocrystals. We are exploring new ways to synthesize these nanocrystals with varaible dimensionality (e.g., quantum dots and nanorods) while controlling their size, crystal phase, and ligand composition. We further demonstrate their strong potential in infrared photodetectors and LEDs.

Read our recent works on HgTe:

TOC figure from Md. Samim Hassan's article on alloyed bismuth chalcogenide nanosheets for CO2 reduction
TOC figure from Yun Li's work on iron phthalocyanine covalent organic frameworks

We are investigating the catalytic properties of MXenes, halide perovskites, topological insulators, and covalent-organic frameworks. Our approach involves engineering defects, doping with single and dual atoms, modifying surfaces through ligand chemistry, and designing nanoheterostructures. We focus on H2 and O2 evolution reactions, as well as O2 and CO2 reduction reactions, utilizing both electrocatalytic and photoelectrocatalytic pathways.

Read our recent works on catalysis: