Advanced Semiconductor Laboratory
Developing cutting-edge technologies based on III-nitride semiconductors

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Monthly Archives: October 2016

Pi-Pi* Semiconducting Bandgaps and Narrow Absorption Bandwidths

Renad AlJefri - October 26, 2016

Pi-Pi* Semiconducting Bandgaps
Organic semiconductors are made from conjugated organic materials, which have an alternating single bond (sigma bond) and double bonds (sigma and pi bond). The semiconductors’ nature arises from the delocalized and weakly held pi electrons. The pi to pi* energy transition controls the electronic and optical properties of the materials.​
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Alternative current in conductor

Kuang-Hui Li - October 26, 2016

When one applies alternative current on a conductor, most of the current will flow through a thin layer near the surface instead of through the whole conductor. This phenomenon is called skin effect, and that is exactly the reason why power cable contains copper fiber bundle​​​​

Planar MOSFETs vs. FinFETs

Nasir Alfaraj - October 26, 2016

The metal-oxide-semiconductor field-effect transistor (MOSFET) is the basic element used in designing and fabricating modern high-performance integrated circuits (ICs) for switching or amplifying electronic signals. MOSFETs enjoy considerable advantages in terms of integration feasibility:

Vision Art by Electrons––The Imaging Technology

Muwei Zhang - October 25, 2016

​Thousands of years, people always hold great interests in recording the marvelous scenes in their lives. However, our eyes are just like a high-resolution cache video cameras without a sharing button of Twitter or Facebook. ​

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High temperature thermal annealing

Feng Wu - October 25, 2016

​For the group-III nitrides grown by MOCVD, it was well established that a buffer layer, either GaN or AlN, grown at low temperature, played a key role in the crystal quality of the epitaxial layer grown on this buffer layer. However, the dislocation density of III-nitride layers grown on sapphire is still very high.  ​

Random laser ABC

Ronghui Lin - October 25, 2016

When light interacts with random structure, it will undergo multiple scattering, such interacts are discovered everywhere in nature, such as clouds, white paint, powders and even human tissue[1] . While for scientist, their role is to create order and find the order, this random interaction can also provide us with new paradigm for device design, such as random laser.

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