Issue 1, 2023

P- and N-dopable ambipolar bulk heterojunction thermoelectrics based on ladder-type conjugated polymers

Abstract

Ambipolar bulk heterojunction polymer thermoelectrics were demonstrated for the first time using a classic n-type poly(benzimidazobenzophenanthrolinedione) ladder polymer (BBL) and a new p-type 6H-pyrrolo[3,2-b:4,5-b′]bis[1,4]benzothiazine ladder polymer (PBBTL). The blend films were solution-processed and can be p-/n-doped using a FeCl3/benzyl viologen radical cation (BV˙+). Well-balanced p- and n-doped conductivities can be achieved at a 1 : 1 blend ratio, and a full thermoelectric device consisting of a pair of p- and n-channel legs from a single layer blend film was fabricated. The full device exhibited a power density of 0.27 μW cm−2 at ΔT = 3 K, operating at a voltage of 0.93 mV and a current density of 0.29 mA cm−2. The simplification of the device fabrication process using such ambipolar bulk heterojunction blend films may help the realization of polymer micro-thermoelectric devices in the future.

Graphical abstract: P- and N-dopable ambipolar bulk heterojunction thermoelectrics based on ladder-type conjugated polymers

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2022
Accepted
22 Nov 2022
First published
25 Nov 2022

J. Mater. Chem. C, 2023,11, 204-210

P- and N-dopable ambipolar bulk heterojunction thermoelectrics based on ladder-type conjugated polymers

Q. He, T. L. D. Tam, X. Q. Koh, N. N. Tham, H. Meng, W. Huang and J. Xu, J. Mater. Chem. C, 2023, 11, 204 DOI: 10.1039/D2TC03684C

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