Technical / Research

RIBER announced today that it has sold a Compact 21 system to the Innovation of High Performance Microelectronics (IHP) laboratory in Germany.

The system sold to IHP will thus be equipped with a gas injector and be devoted to the development of graphene-based applications. Compact 21 is the MBE research system that has sold the most units in the world. It is highly flexible and offers great  adaptability to meet the most demanding specifications of applied research on compound semi-conductor materials.

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Researchers at Stanford University have successfully developed a brand new concept of OLEDs with a few nanometer of graphene as transparent conductor. This paved the way for inexpensive mass production of OLEDs on large-area low-cost flexible plastic substrate, which could be rolled up like wallpaper and virtually applied to anywhere you want. The researchers say that Graphene has the potential to be transparent, high-performance, highly conductive and cheaper by several orders of magnitude than current ITO based solutions.

Traditionally, indium tin oxide (ITO) is used in OLEDs, but indium is rare, expensive and difficult to recycle. Scientists have been actively searching for an alternative candidate.

The next generation of optoelectronic devices requires transparent conductive electrodes to be lightweight, flexible, cheap, environmental attractive, and compatible with large-scale manufacturing methods. Graphene (a single layer of graphite) is becoming a very promising candidate due to its unique electrical and optical properties. Very recently, Junbo Wu et al., researchers at Stanford University, successfully demonstrated the application of graphene in OLEDs for the first time.

Junbo Wu, leading researcher of the development, said that they achieved OLEDs on graphene with performance similar to a control device on conventional ITO transparent anodes, which is very exciting and promising for real-world applications. Because Graphene is only a couple of nanometers thick, it can give device designers more freedom.

For detailed information on this research, please refer to http://pubs.acs.org/doi/abs/10.1021/nn900728d.

Via OLED-Info

Researchers from UCLA has created a new Graphene nanostructure called Graphene nanomesh (GNM). The new structure is able to open up a band gap in a large sheet of graphene to create a highly uniform, continuous semiconducting thin film that may be processed using standard planar semiconductor processing methods.

The nanomesh can have variable periodicities, defined as the distance between the centers of two neighboring nanoholes. Neck widths, the shortest distance between the edges of two neighboring holes, can be as low as 5 nanometers. This ability to control nanomesh periodicity and neck width is very important for controlling electronic properties because charge transport properties are highly dependent on the width and the number of critical current pathways.

Via AzoNano

Researchers at Georgia Tech say they have developed a one step process that enables both n- and p-type doping of large area graphene surfaces. The used commercially available spin on glass (SOG) material and applied to a sheet of graphene and then exposing it to electron beam radiation. To create both doping types you simply vary the exposure time, with higher levels of energy producing p-type areas.

Via NewElectronics

Nanotek Instruments, parent company of Angstron Materials, has been issued a US Patent for its development of a new high-performing class of meso-porous nanocomposites.  The new nanocomposite provides a superior supercapacitor electrode material for uses that include hybrid electric vehicles (EVs), transportation and energy storage.  The technology is based on the company’s breakthrough discovery of nano graphene platelets (NGPs).  Angstron, the world leader in production of NGPs, will make the nanocomposite material.

Angstron will provide the meso-porous NGP nanocomposites in two forms: NGPs coated with a thin layer of conducting polymer or surface functional groups and NGPs bonded by a conductive binder, coating, or matrix material such as a polymeric carbon.  The platelets in these products are comprised of a sheet of graphite plane or multiple sheets of graphite plane with a thickness less than 10 nm and an average length, width, or diameter smaller than 500 nm.  The binder or matrix material bonded to the platelets to form the nanocomposite material create a surface area greater than 500 m.sup.2/gm.

Aixtron announced today that it has received a purchase order for a 6" Black Magic Plasma Enhanced CVD (PECVD) system for graphene and carbon nanotube (CNT) growth from the University of California (UCSB).

This combined thermal CVD and plasma enhanced CVD tool is planned to be delivered in first quarter 2010 to Professor Kaustav Banerjee, who directs the Nanoelectronics Research Lab at UCSB. The PECVD system uses unique rapid heating and plasma technologies that is used to produce various types of nanotubes, including low temperature, multiwall, singlewall and supergrowth nanotubes.

Researchers from Sweden and the US have produced a new transparent lighting component that is made from Graphene. They say it is cheap to make and fully recyclable, and might be an alternative to OLED Lighting. The new device is called an Organic Light-emitting Electrochemical Cell, or LEC. The Graphene is used for an electrode. 

LECs can be made using a roll-to-roll process, because all of its parts can be made from liquid solutions.

Via AzoNano