Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Direct mapping of local Seebeck coefficient in 2D material nanostructures via scanning thermal gate microscopy
AU - Harzheim, Achim
AU - Evangeli, Charalambos
AU - Kolosov, Oleg
AU - Gehring, Pascal
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Studying local variations in the Seebeck coefficient of materials is important for understanding and optimizing their thermoelectric properties, yet most thermoelectric measurements are global over a whole device or material, thus overlooking spatial divergences in the signal and the role of local variation and internal structure. Such variations can be caused by local defects, metallic contacts or interfaces that often substantially influence thermoelectric properties, especially in two dimensional materials. Here, we demonstrate scanning thermal gate microscopy, a non-destructive method to obtain high resolution 2-dimensional maps of the thermovoltage, to study graphene samples. We demonstrate the efficiency of this newly developed method by measuring local Seebeck coefficient in a graphene ribbon and in a junction between single-layer and bilayer graphene.
AB - Studying local variations in the Seebeck coefficient of materials is important for understanding and optimizing their thermoelectric properties, yet most thermoelectric measurements are global over a whole device or material, thus overlooking spatial divergences in the signal and the role of local variation and internal structure. Such variations can be caused by local defects, metallic contacts or interfaces that often substantially influence thermoelectric properties, especially in two dimensional materials. Here, we demonstrate scanning thermal gate microscopy, a non-destructive method to obtain high resolution 2-dimensional maps of the thermovoltage, to study graphene samples. We demonstrate the efficiency of this newly developed method by measuring local Seebeck coefficient in a graphene ribbon and in a junction between single-layer and bilayer graphene.
KW - 2D materials
KW - graphene
KW - nanothermal
KW - SThM
KW - STGM
KW - scanning thermal gate microscopy
KW - scanning thermal microscopy
KW - thermoelectric
KW - nanoscale heat transport
KW - heat transport
KW - thermoelectricity
KW - Seebeck coefficient
U2 - 10.1088/2053-1583/aba333/meta
DO - 10.1088/2053-1583/aba333/meta
M3 - Journal article
VL - 7
JO - 2D Materials
JF - 2D Materials
SN - 2053-1583
IS - 4
M1 - 041004
ER -