Yonsei University – TechConnect Briefs

The influence of electrode on sensitivity of pH sensors fabricated on AlGaN/GaN heterostructures

Jung, S.M., Lee, C.T., Shin, M.W., Yonsei University, KR

In this work, we evaluated relationship between specific contact resistance and sensitivity of pH sensor by changing the ohmic contact metallization consisted of source and drain. The sample was fabricated for analysis of electrical characteristics [...]

Thermal conductivity model for polymer/Boron Nitride nanocomposite considering air void content

Kim, J.H., Park, S.Y., Shin, M.W., Yonsei University, KR

Polymer/Boron Nitride (BN) nanocomposite is promising interfacial material for cooling of electronic systems. It is important to determine percolation threshold when it practically uses in the industry. But, the exact prediction with existing model is [...]

Silver Nanoplate Array for Vertically Aligned P-type ZnO Nanorods

Lee, T.I., Myoung, J.-M., Park, J.H., Yonsei University, KR

In this presentation, a monolayer of silver nanoplate is introduced as an epitaxial template and doping source for vertically aligned p-type ZnO nanorods. Silver nanoplates were synthesized through room temperature polyol process and the monolayer [...]

Converting Dimensions: A Facile and High-Yield Route for Getting Sub-100 nm Silicon Nanowires

Lee, S-H., Yonsei University, KR

For synthesizing uniform sub-100-nm Si nanowires (NWs), we introduce a metal-assisted chemical etching (MCE)-based facile and high-yield route, employing simple thermal annealing and vacuum deposition processes. Under rapid thermal annealing, an ultrathin Ag film on [...]

Improvement of contact resistance in transparent thin film transistor by applying an Al/SWCNTs bilayer as electrodes

Lee, S.J., Yonsei University, KR

SWCNTs have various bandgaps so that they show metal as well as semiconductor characteristic. However, it is difficult to separate the metallic and the semi-conducting SWCNTs. Also, the high contact resistance at the interface between [...]

The role of cetyltrimethylammonium bromide in efficiency of organic-quantum dot hybrid solar cell

Heo, S.J., Kim, H.-J., Oh, S.H., Yoon, S., Yonsei University, KR

We fabricated high efficiency organic-quantum dot hybrid solar cells. By employing the hybrid active layer, which absorbed the light in wide range, the short circuit current (Jsc) is increased due to a multiple exciton generation [...]

The role of cetyltrimethylammonium bromide in efficiency of organic-quantum dot hybrid solar cell

Heo, S.J., Kim, H.-J., Oh, S.H., Yoon, S., Yonsei University, KR

We fabricated high efficiency organic-quantum dot hybrid solar cells. By employing the hybrid active layer, which absorbed the light in wide range, the short circuit current (Jsc) is increased due to a multiple exciton generation [...]

Multifunctional Micropatterned Nanofiber Capable of Cell Patterning, Metabolite Detection, and Growth Factor Delivery

Koh, W.G., Lee, H.J., Lee, H.W., Park, S., Yonsei University, KR

This study describes the development of multifunctional nanofiber scaffolds consisting of multiple layers of nanofiber scaffolds and nanofiber-incorporated PEG hydrogels. We fabricated double-layered nanofiber scaffolds that were micropatterned with PEG hydrogels by combining two-step sequential [...]

NH3 sensing properties of centimeter scaled CVD graphene in ambient condition

Ahn, H-R, Anoop, R., Jun, S.C., Kim, J.H., Kim, Y.J., Lim, J., Song, S., Yoon, J., Yonsei University, KR

The present work reports ammonia (NH3) gas sensing properties of Graphene film synthesized by chemical vapor deposition (CVD) in ambient condition. Graphene with a large area is synthesized on Cu foils by chemical vapor deposition [...]

Radon Mitigation Efficiency using Nano-size Carbon Colloid

Cho , S.Y., Jung, K.S., Kim, D-H., Kim, M-J, Kim, S-H, Lee, K.H., Yonsei University, KR

Radon is classified as the second leading cause of lung cancer in the US. There have been plenty of trials to mitigate indoor radon gas which penetrated through the floor cracks, building materials and groundwater [...]