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
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, particularly for lighting and display applications. We aim to improve the efficiency and stability of our devices by optimizing crystal growth. By utilizing chiral ligands, we prepare nanocrystals that exhibit circularly-polarized emission—a unique feature that enables their use in advanced spin-LEDs.

Read our recent works on perovskite LEDs:

Fluorescence of carbon dots under UV excitation

Commonly known under the term "carbon dots", this diverse family of carbon nanoparticles can be used in a wide range of applications, from sensing and biomedicine to optoelectronics. In our group, we try to find new synthetic routes to achieve unique properties of carbon dots, such as chirality, simultaneous magnetic resonance and luminescence responses, photothermal properties, and biocompatibility.

Read our recent works on carbon dots:

Boosting infrared luminescence of HgTe quantum dots by coupling with plasmonic metasurface
First-ever made stable wurtzite HgTe nanorods

Our research group is at the forefront of developing infrared photodetectors based on HgTe quantum dots. We are exploring new ways to synthesize these quantum dots and better control their shape, size, and ligand composition, aiming to improve their morphological and spectral properties to meet the strict requirements of infrared optoelectronics.

Read our recent works on HgTe:

TOC figure from Xin Zhao's article on dual-atom electrocatalysts
TOC figure from Md. Samim Hassan's work on bidentate ligands on perovskite nanocrystals for photocatalytic CO2 reduction

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: