Zhaojun Li Group

The group's research focus is on the conceptualisation and development of innovative materials.

Research

It is an urgent challenge to realise a carbon-free future within the next two decades. This goal requires not only advanced technical engineering, but also a pioneering effort in new science and material development to increase the performance and sustainability of our energy solutions.

Our primary focus is on the conceptualisation and development of innovative materials. These materials include both organic semiconductors and low-dimensional inorganic semiconductors, such as transition metal dichalcogenides (TMDs). We will also exploit these materials to achieve sustainable and efficient optoelectronics (solar cells, photodetectors, LEDs, etc.) to help address these challenges.

If you want to know more about the research in the Li Group, you can read more on the group's external website

Development of 2D semi-conducting materials for sustainable LEDs

There is extensive research aimed at achieving light emitting diodes (LEDs) with outstanding performance at low cost, while being flexible and lightweight. However, the most efficient LEDs that can be processed in solution contain toxic substances or require toxic solvents. In this project, we develop sustainable high brightness 2D TMD nanosheets and fabricate efficient LEDs using a "green" manufacturing process. We exploit the photophysical properties of these materials and the charge dynamics of the devices and study them with ultrafast optical spectroscopy. In addition, we investigate the morphology with Resonant Soft X-ray Scattering (RSoXs) and Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) to understand the device performance.

Eco-friendly defect passivation of 2D TMDs for optoelectronic applications

The discovery of 2D semiconducting materials based on transition metal dichalcogenides (TMDs), with the chemical structure MX2 (M=Mo, W; X=S, Se, Te), has opened up exciting new opportunities in optoelectronic devices. In this project, we develop environmentally friendly chemical treatments to passivate the defects of 2D TMD materials and investigate the effect with photoluminescence and Raman spectroscopy, as well as charge transport measurements. We also develop the mechanistic picture of the defect passivation using X-ray spectroscopy.

Financial Support

The ÅForsk Foundation
Göran Gustafssons Stiftelse
Bertil & Britt Svenssons Stiftelse för Belysningsteknik

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Contact

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Zhaojun Li