Chalcogenidometallates could be used for bonding II-VI, IV-VI and V-VI semiconductor materials, says a team of researchers from the University of Chicago.
An ideal semiconductor solder needs to match that of the semiconductors it is bonding. The Chicago researchers have found that chalcogenidometallates based on cadmium, lead and bismuth might be useful in bonding II-VI, IV-VI and V-VI semiconductors.
The researchers showed that a Na2Cd2Se3 solder could bond CdSe nanocrystals without destroying the semiconductor’s electronic properties. They confirmed this by making field-effect transistors (FETs) from soldered CdSe nanocrystals and measuring their electron mobilities – which they found to be as high as 210 cm2/Vs.
This value is the best yet for any solution-processed inorganic semiconductor FET and proves that the grain boundaries in the materials do not contain many charge transport “bottlenecks”. In another experiment, the team succeeded in soldering CdTe crystals with Na2CdTe2.
Metal-metal contacts continue to behave as Ohmic conductors but Schottky barriers form at semiconductor-semiconductor interfaces because of trapped charged carriers or when Fermi levels misalign.
Impurities are introduced when making electrical contacts on nanostructures using techniques like electron beam lithography, for instance. As well as being expensive and time-consuming, the
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