Research

Colloidal nanomaterials, which are synthesized via colloidal synthetic routes, are composed of the inorganic nanocrystal core and organic ligand shell, and thus are dispersed in the solvents enabling the use of ink form.

Thin-films using colloidal nanomaterials can be fabricated using various solution processing such as spin-, dip- and spray-coating methods with the absence of any thermal annealing step. 

Therefore, the colloidal nanomaterials with various functionalities (i.e., electrical, optical, electrochemical properties, etc.) are of great interest in the electronic and optoelectronic device applications. 

In addition, the colloidal nanomaterials are highly advantageous for the flexible, stretchable devices  and their large production of roll-to-roll process.

High-quality and monodisperse nanomaterials  including metal, semiconductor quantum dot (QD), and metal oxide can be prepared via the hot-injection and thermal decomposition synthesis methods using long-chain hydrocarbon ligands such as oleic acid, oleylamine.

We are now conducting the surface modification, passivation and manipulation of colloidal nanomaterials to enhance the charge transporting ability, optical  and optoelectronic properties and lead to improving the renewable energy and optoelectronic device performance. 

Representative nanomaterials handled in our Lab.: CsPbI3 QDs, PbS QDs, Ag, Au, AgBiS2, ZnO, TiO2, and BaTiO3 nanocrystals, etc.)

Our Lab. research is now focused on the energy harvesting device applications such as solar cells, piezoelectric and triboelectric nanogenerators based on the various functional colloidal nanomaterials.

In addition, we are also interested in light-emitting applications such as electroluminescent (EL) devices. 

Ultimate goal of our Lab. research is to realize the combined light energy harvesting and emitting system for the reversibly-controlled light energy transformation. We are now called it as "Light-Emitting Photovoltaics".