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Toward thermoelectric characterization of (nano)materials by in situ transmission electron microscopy

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arXiv:2404.19366v1 Announce Type: new
Abstract: We explore the possibility to perform an in situ transmission electron microscopy (TEM) thermoelectric characterization of materials. A differential heating element on a custom in situ TEM microchip allows to generate a temperature gradient across the studied materials, which are simultaneously measured electrically. A thermovoltage was induced in all studied devices, whose sign corresponds to the sign of the Seebeck coefficient of the tested materials. The results indicate that in situ thermoelectric TEM studies can help to profoundly understand the interplay between the thermoelectric properties on one side and the structure/composition of the materials down to the atomic level on the other side, including grain boundaries, dopants or crystal defects. We propose an improved in situ TEM microchip design, which should facilitate a full quantitative measurement of the induced temperature gradient, the electrical and thermal conductivities, as well as the Seebeck coefficient.

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