Mapping the heterogeneity of charge carriers in nanocrystals

Direct mapping of charge carrier heterogeneity in Bi₂Se₃ nanocrystals

Nano-FTIR spectroscopy and IR nano-imaging neaSCOPE systems are ideal tools for studying the density of electric charge carriers at the nanoscale, and in addition to qualitative analysis, they also enable their quantitative determination in topological insulators and other quantum materials.

IR nanoscopy and nano-FTIR spectroscopy of polyol-synthesized Bi₂Se₃ and Sb₂Te₃ nanocrystals can detect local changes in charge carrier concentration with much greater sensitivity than other commonly used methods. The observed inhomogeneities shown in the figure are attributed to the formation of internal defects during the synthesis of the material. IR nano-imaging and infrared nanoscopy thus provide a unique way to optimize the production of nanomaterials with specific properties.

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