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Linkam reports on the low temperature characterization of nano-structures using temperature controlled microscopy at the University of Southern California

Linkam’s THMS600 stage mounted on a Renishaw Raman system at the University of Southern California

Tadworth, UK- 29th January 2014: Market leaders in temperature controlled microscopy, Linkam Scientific Instruments report on the use of their stages in the study of nano-structures at the University of Southern California in the United States of America.

The University of Southern California first started teaching electrical engineering over a century ago and its USC Viterbi School of Engineering is ranked as one of the best in the United States. The Cronin lab, which is located within this prestigious school, is working on pioneering new technologies which could revolutionize solar energy storage and via a process known as plasmonic catalysis potentially allow us to use solar energy even when the sun isn’t shining.

PhD student, Miss Shermin Arab, and her colleagues at the Cronin Lab are currently focusing their studies on the fabrication and transport study of numerous nano-structures. The team has used a Linkam stage to carry out optoelectronic research on these tiny structures in order to characterize them. So far, the team has been looking at a wide range of materials including gallium arsenide (GaAs) nanowires which have been shown to optimize the absorption of sunlight in solar cells. They are also studying the potentially revolutionary 21st century super-material graphene.

The two main optoelectrical characterization methods that have been used in this research are photoluminescence (PL) and photo I-V measurements. These measurements require very stable temperature control and it is here that the Linkam stage has proved invaluable to Miss Arab. She says: “In order to reduce the noise, improve the quantum efficiency and be able to observe excitonic behavior, these measurements are made at low temperatures. Our measurements are usually performed at 77K (-196 °C). We use the Linkam stage and liquid nitrogen to cool down the sample. The Linkam setup also allows us to perform a temperature-dependent study on the samples; where, we vary the temperature from room temperature to 77K and perform the measurements (PL or I-V) at specific temperature points.”

The team used a Linkam THMS600 stage to illuminate the sample and perform low temperature, light dependent measurements such as the two mentioned above. Photoluminescence is used in their lab to illuminate samples with a desired laser and then collect and analyze the emitted light after photon absorption. This measurement is especially important in finding out the crystalline quality of the GaAs nanostructures which has a huge effect on their efficiency.

Continuing, Miss Arab says, “As we move into an era where nano-structures are going to play a vital role in [take out all of] our everyday lives, research and characterization of such materials will prove influential and allow us to optimize and tailor them to suit our needs.”

Visit Linkam at www.linkam.co.uk and learn about the broad range of applications in the field of temperature-controlled microscopy.

About Linkam Scientific Instruments
Linkam develops and manufactures a broad range of heating and freezing stages for both OEM and end users to visualize and explore materials properties. Used in conjunction with light microscopes and other forms of spectroscopy, Linkam stages are found in thousands of laboratories worldwide with the most successful microscope heating stage, the THMS600, selling over 4,000 units alone. Linkam is the market leader in temperature controlled microscopy.

Linkam Scientific Instruments Limited
8 Epsom Downs Metro Centre
Waterfield
Tadworth
Surrey KT20 5LR
T +44 (0)1737 363476
http://www.linkam.co.uk
ricky.patel@linkam.co.uk

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