Semiconducting-to-metallic transition leading to large n-type Seebeck coefficient in a copper thiolate-based coordination polymer
Abstract
The exploration of metallicity in two-dimensional coordination polymers (2D CPs) remains challenging but crucial for their development toward various applications in electronics and thermoelectrics. Here, we report the low-temperature electronic transport properties of a 2D CP, copper(I)-1,3-benzenedithiolate, [Cu₂(1,3-BDT)]n. A semiconductor-to-metal transition in electrical resistivity is observed below 150 K. This transition is accompanied by a sign change and the emergence of large negative Seebeck coefficient values, shifting from a few hundred positive μ V K−1 to negative values in the mV K−1 range, as well as the onset of paramagnetism at low temperatures in the magnetic susceptibility. Based on first-principles calculations, these observations are attributed to an intrinsic temperature-driven drift of the electrochemical potential between the edges of two electronic state distributions separated by a small energy gap.
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BibTeX
@article{demessence2026semiconductingtometallic,
title = {{Semiconducting-to-metallic transition leading to large n-type Seebeck coefficient in a copper thiolate-based coordination polymer}},
author = {A. Demessence and Chloé Andrade and Alexis Giraudon and Régis Debord and Nathalie Guillou and Erik Elkaïm and Florent Perret and Thomas Niehaus and Stéphane Pailhès},
journal = {Synthetic Metals},
year = {2026},
month = oct,
doi = {10.1016/j.synthmet.2025.117912},
url = {https://hal.science/hal-05289743v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Semiconducting-to-metallic transition leading to large n-type Seebeck coefficient in a copper thiolate-based coordination polymer
AU - A. Demessence
AU - Chloé Andrade
AU - Alexis Giraudon
AU - Régis Debord
AU - Nathalie Guillou
AU - Erik Elkaïm
AU - Florent Perret
AU - Thomas Niehaus
AU - Stéphane Pailhès
PY - 2026
DA - 2026/10/30
JO - Synthetic Metals
DO - 10.1016/j.synthmet.2025.117912
UR - https://hal.science/hal-05289743v1
AB - The exploration of metallicity in two-dimensional coordination polymers (2D CPs) remains challenging but crucial for their development toward various applications in electronics and thermoelectrics. Here, we report the low-temperature electronic transport properties of a 2D CP, copper(I)-1,3-benzenedithiolate, [Cu₂(1,3-BDT)]n. A semiconductor-to-metal transition in electrical resistivity is observed below 150 K. This transition is accompanied by a sign change and the emergence of large negative Seebeck coefficient values, shifting from a few hundred positive μ V K−1 to negative values in the mV K−1 range, as well as the onset of paramagnetism at low temperatures in the magnetic susceptibility. Based on first-principles calculations, these observations are attributed to an intrinsic temperature-driven drift of the electrochemical potential between the edges of two electronic state distributions separated by a small energy gap.
SN - 0379-6779
ER -