29 August 2011

Lake Shore extends Hall mobility measurement down to 0.001cm2/Vs 

In collaboration with Japan’s Toyo Corp, Lake Shore Cryotronics Inc of Westerville OH, USA has introduced the 8400 Series Hall effect measurement system (HMS). Optional AC field measurement capability allows measurement of Hall mobilities down to 0.001cm2/Vs — lower than ever possible using traditional DC field Hall measurement techniques. 

Many contemporary semiconductor and electronic materials are being developed for applications including green energy, efficient lighting, flexible inexpensive electronics, and high-power devices, says Lake Shore. This emerging class of photovoltaic (solar), thermoelectric and organic electronic materials are characterized by low mobilities that are difficult, if not impossible to measure. In fact, current electronic transport property measurement systems cannot measure many of these materials due to their low charge carrier mobilities and the high temperatures needed to characterize them, the firm adds.

Traditionally, the DC field Hall measurement technique has been sufficient to measure materials with mobilities down to about 1cm2/Vs. However, it is challenging to extract the diminishingly small Hall voltage from the background noise that is produced by such materials using DC field techniques.

In order to close the gap between traditional DC field measurement techniques and these low mobility materials, Lake Shore and Toyo’s partnership has resulted in the 8400 Series HMS, which has an AC field Hall measurement option capable of measuring mobilities down to 0.001cm2/V s, allowing measurement of low-mobility materials with ease, it is claimed.

Upon initial release, the Model 8404 HMS can provide a full range of Hall measurements on van der Pauw samples. The system comes as standard equipped with DC field measurement capabilities and a resistance range from 0.5mΩ to 10MΩ. Options including AC field capability, variable temperature assemblies, high resistance and low resistance are available to broaden measurement opportunities and simplify experimental processes. The Model 8404 provides a robust platform to which you can add new features as your material measurement needs evolve, Lake Shore adds. 

Tags: Lake Shore Hall effect measurement

Visit: www.lakeshore.com/8400.html