superacid treatment of MoS2

In this work, we studied the effect of the superacid treatment on the optical and electrical properties of monolayer exfoliated and CVD MoS2. Our work draws new insight into the responsible mechanism for improving the material properties of MoS2 upon treatment with superacid.

Large-area synthesis of layered 2D materials

Tungsten disulfide (WS2) is among promising 2D semiconducting materials for device applications due to its small effective mass of electrons, strong spin-orbit coupling, and large energy bandgap. In this study, we demonstrated large monolayer WS2 with intrinsic field-effect mobility of ~50cm^2/V.s. that is the highest reported so far for CVD WS2. This is an important step toward improving the quality of synthetic WS2 for device applications.

Strain engineering in flexible electronics

High-performance flexible electronics using semiconductors such as silicon and gallium arsenide is an emerging technology. We introduced a new method for strain engineering in flexible devices by leveraging their thin geometrical forms. In this study, we demonstrated energy band engineering of flexible GaAs devices using substrate cracking.

Devices and circuits from nanomaterials

We are interested in the science and technology of low-dimensional materials such as semiconductor nanowires, graphene and other emerging two-dimensional materials, for electronic and optoelectronic applications.

Advanced photovoltaics

Flexible thin-film tandem solar cells with high specific power- The ultra-light weight of the thin-film PV devices together with their very high conversion efficiency make these devices attractive candidates for portable applications. In particular, we are interested in studying the electronic and optoelectronic properties of band engineered heterostructures for realizing high-performance devices.

Flexible nanoelectronics

Nanoscale silicon on insulator devices and circuits with the silicon body thickness of 6nm transferred onto a flexible substrate using the controlled spalling layer transfer technique. Our group is particularly interested in material engineering of high-speed and low-power devices for realizing wearable integrated bioelectronic systems.

Our lab is investigating the application of nano-engineered hybrid integrated systems in the emerging frontiers of sensing and life sciences. We design and implement those systems by combining the benefits of emerging nanotechnologies with conventional electronics (e.g. silicon CMOS chips). We use nanofabrication techniques to engineer nanodevices and study the fundamental properties of low-dimensional electronic materials.