Device fabrications & applications

1. Inorganic microLED for display applications

3-dimensional nanoarchitecture microLEDs are attracting tremendous amount of interest as a candidate for next-generation light-emitters, since they offer huge amount of additional light-emitting area compared with planar LEDs and show many unconventional properties which were very hard to achieve with conventional LEDs. We are interested in designing new nanoarchitecture LEDs to create novel device concepts.

2. Flexible inorganic optoelectronics

Large-scale and flexible electronic and optoelectronic devices have recently attracted much attention for use in wearable displays, solar cells, sensors, and biomedical devices. For the bendable and wearable devices, organic films due to their excellent scalability and flexibility have widely been employed. Meanwhile, achieving flexible devices using inorganic films is still very challenging because of the rigidity and brittleness inherent to inorganic films and single-crystalline substrates. To resolve this problem, we have fabricated flexible inorganic LEDs using GaN microstructures grown on CVD graphene. Currently, we are interested in applications of the flexible inorganic LEDs on many rising fields such as wearable display and bio-medical devices.

3. Flexible inorganic electronics

We also fabricated flexible vertical field-effect transistor (VFET) and resistive random access memory (RRAM) using ZnO nanotube and NiO/GaN microdisk grown on CVD-graphene films, respectively. The flexible inorganic electronics are important component in flexible devices due to their excellent device stability under various substrate bending conditions.

4. Flexible sensors

Wearable sensors are key components for the next-generation electronic devices. Our group has developed an unique process to produce flexible and stretchable sensors. The 1d-2d hybrid nanomaterial system has enabled to fabricate high performance inorganic sensors which can be detached from original substrates and can be used in devices with flexible and stretchable formfactors.

5. Bio-applications

Inorganic semiconductors have been attracted many attentions to in-vitro/in-vivo researches because they enable researchers to study bio-interfaces using conventional electronics/optoelectronics with their excellent bio-compatibility. However, due to the large differences in mechanical properties between the inorganic semiconductors and cells (or brain), acute immune responses have come and restricted good signal recordings. In terms of this issue, our material can be suggested one of promising candidates to record signals with minimum acute immune responses because they are very small and flexible. We have been co-worked with various groups where are pioneers in this field.