TY - JOUR
T1 - High Thermoelectric Performance Related to PVDF Ferroelectric Domains in P‐Type Flexible PVDF‐Bi0.5Sb1.5Te3 Composite Film
AU - Jiang, Qinghui
AU - Pan, Deng
AU - Wang, Yunfan
AU - Liu, Yong
AU - Luo, Yubo
AU - Yang, Junyou
AU - Li, Baowen
AU - Dunn, Steve
AU - Yan, Haixue
PY - 2023/12/7
Y1 - 2023/12/7
N2 - There is increasing demand to power Internet of Things devices using ambient energy sources. Flexible, low-temperature, organic/inorganic thermoelectric devices are a breakthrough next-generation approach to meet this challenge. However, these systems suffer from poor performance and expensive processing preventing wide application of the technology. In this study, by combining a ferroelectric polymer (Polyvinylidene fluoride (PVDF, β phase)) with p-type Bi0.5Sb1.5Te3 (BST) a thermoelectric composite film with maximum is produced power factor. Energy filter from ferroelectric-thermoelectric junction also leads to high Seebeck voltage ≈242 µV K−1. For the first time, compelling evidence is provided that the dipole of a ferroelectric material is helping decouple electron transport related to carrier mobility and the Seebeck coefficient, to provide 5× or more improvement in thermoelectric power factor. The best composition, PVDF/BST film with BST 95 wt.% has a power factor of 712 µW•m−1 K−2. A thermoelectric generator fabricated from a PVDF/BST film demonstrated PmaxT 12.02 µW and Pdensity 40.8 W m−2 under 50 K temperature difference. This development also provides a new insight into a physical technique, applicable to both flexible and non-flexible thermoelectrics, to obtain comprehensive thermoelectric performance.
AB - There is increasing demand to power Internet of Things devices using ambient energy sources. Flexible, low-temperature, organic/inorganic thermoelectric devices are a breakthrough next-generation approach to meet this challenge. However, these systems suffer from poor performance and expensive processing preventing wide application of the technology. In this study, by combining a ferroelectric polymer (Polyvinylidene fluoride (PVDF, β phase)) with p-type Bi0.5Sb1.5Te3 (BST) a thermoelectric composite film with maximum is produced power factor. Energy filter from ferroelectric-thermoelectric junction also leads to high Seebeck voltage ≈242 µV K−1. For the first time, compelling evidence is provided that the dipole of a ferroelectric material is helping decouple electron transport related to carrier mobility and the Seebeck coefficient, to provide 5× or more improvement in thermoelectric power factor. The best composition, PVDF/BST film with BST 95 wt.% has a power factor of 712 µW•m−1 K−2. A thermoelectric generator fabricated from a PVDF/BST film demonstrated PmaxT 12.02 µW and Pdensity 40.8 W m−2 under 50 K temperature difference. This development also provides a new insight into a physical technique, applicable to both flexible and non-flexible thermoelectrics, to obtain comprehensive thermoelectric performance.
KW - spark plasma
KW - carrier mobility
KW - ferroelectric
KW - tape casting
KW - sustainable
U2 - 10.1002/smll.202306786
DO - 10.1002/smll.202306786
M3 - Article
C2 - 38061990
SN - 1613-6829
VL - 20
JO - Small (Weinheim an der Bergstrasse, Germany)
JF - Small (Weinheim an der Bergstrasse, Germany)
IS - 19
M1 - 2306786
ER -