Research Area and Interests
The board research objective in my group is to use an integrated approach combining novel electronic materials and electrical device engineering for energy and electronic applications.
In particular, the race against irreversible global climate change and electronic pollution can be eased substantially with the invention of green energy harvesting and the development of biodegradable electronics.
There are currently two major interests of our research: Flexible and Printed Electronics & Optoelectronic Materials and Devices
Please look through the following content for more details.
Printable electronics, featured with robustness and reliable flexibility has huge potential application in various wearable and integrated electronic devices. In addition, the development of printed, flexible and biocompatible electronics that are composed of non-toxic materials and can completely disappear in a controlled fashion after fulfilling its duty will enable many novel applications such as sensors for food monitoring and integrated health diagnostics. Our group is interested in developing low temperature processed organic/inorganic semiconductors, self-healable, biodegradable/biocompatible materials and integrate them as components of electronic devices (such as transistors, memories, sensors).
Organic solar cell technology has attracted substantial interest from academic and industry due to its potential for low cost, easily manufacturable, and large-scale processing. These desirable properties could be translated into making solar paints for coating the walls and roofs of buildings and supplement the world's drive for renewable energy. Our research interest lies in polymer and small molecules based solar cells, investigate the routes to control the vertical morphology for efficient charge separation (additives, heat treatment) and the role of impurities and trap states on the photovoltaic performance. We are also interested in applying organic nanoparticles dispersed in water to active light absorber layers which will allow environmentally friendly processes as well as offers a solution to the control of nanoscale architecture of the active layer.
Another emerging photovoltaic technology is organic-inorganic halide perovskite solar cells which have become the most efficient solution-processed photovoltaic (PV) technologies with power conversion efficiency >20%. The organometal trihalide perovskite absorbers, such as methylammonium lead halide, CH3NH3PbX3 (X = Cl, Br or I), are highly crystalline even when processed at temperatures as low as 70-100 °C. Their favorable PV characteristics include tunability of optoelectronic properties, high optical absorption (~104 cm-1), low exciton binding energy, long-range charge transport, and efficient charge collection at the contacts. Our group is interested in developing new perovskite materials, in particular, lead-free, as well as investigating fundamental processes, such as loss mechanisms to identify (and hence overcome) the limiting factors for higher solar to electric conversion efficiency.
The advancement of photovoltaic performance is mainly driven by developing new light harvesting materials and improving the absorption properties of the materials. The development of innovative interfacial materials that can be incorporated between the electrodes and the photoactive layer is also important as they can improve the charge collection efficiency by reducing the contact resistance and interfacial recombination loss. The ability to control and modify the properties of the interfaces is critical as it could lead to a significant improvement in all the photovoltaic parameters and enhance device stability against degradation. Our group is developing interfacial materials (such as indium zinc oxide, conjugated polyelectrolytes, conducting polymers) for high performance solar cells. These new interfacial materials are highly versatile, low temperature processable (< 200 °C, hence compatible with flexible substrates) and can be incorporated into existing solar technologies (organic photovoltaics, organic-inorganic perovskite solar cells).
There are currently two major interests of our research:
- Flexible and Printed Electronics
- Optoelectronic Materials and Devices