Composition-matched molecular “solders” for semiconductors

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Science  01 Jan 2015:
DOI: 10.1126/science.1260501

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We propose a general strategy to synthesize largely unexplored soluble chalcogenidometallates of cadmium, lead and bismuth. These compounds can be used as “solders” for semiconductors widely used in photovoltaics and thermoelectrics. The addition of solder helped to bond crystal surfaces and link nano- or mesoscale particles together. For example, CdSe nanocrystals with Na2Cd2Se3 solder was used as a soluble precursor for CdSe films with electron mobilities exceeding 300 centimeters squared per volt-second. CdTe, PbTe and Bi2Te3 powders were molded into various shapes in the presence of a small additive of composition-matched chalcogenidometallate or chalcogel, thus opening new design spaces for semiconductor technologies.

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