Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session B33: Organic Optoelectronics and Photonics I
11:30 AM–2:30 PM,
Monday, March 4, 2024
Room: 102E
Sponsoring
Unit:
DPOLY
Chair: Kyungtae Kim, Los Alamos National Laboratory
Abstract: B33.00012 : Many-body charge transport physics of heavily doped polymer semiconductors*
2:06 PM–2:18 PM
Presenter:
Dionisius Hardjo Lukito Tjhe
(Univ of Cambridge)
Authors:
Dionisius Hardjo Lukito Tjhe
(Univ of Cambridge)
Xinglong Ren
(Univ of Cambridge)
Ian Jacobs
(Univ of Cambridge)
Gabriele d'Avino
(Institut Neel, CNRS)
Tarig Mustafa
(Univ of Cambridge)
Thomas Marsh
(Univ of Cambridge)
Lu Zhang
(Univ of Cambridge)
Yao Fu
(Univ of Cambridge)
Ahmed Mansour
(Humboldt Universitat zu Berlin)
Yuxuan Huang
(Univ of Cambridge)
Wenjin Zhu
(Univ of Cambridge)
Ahmet Hamdi Unal
(Univ of Cambridge)
Vincent Lemaur
(Univ of Mons)
Claudio Quarti
(Univ of Mons)
Jin-Kyun Lee
(Inha University)
Iain McCulloch
(Univ of Oxford)
Martin Heeney
(Imperial College London)
Norbert Koch
(Humboldt Universitat zu Berlin)
Clare Grey
(Univ of Cambridge)
David Beljonne
(Univ of Mons)
Simone Fratini
(Institut Neel, CNRS)
Henning Sirringhaus
(Univ of Cambridge)
MacDiarmid, and Shirakawa. While the charge transport physics in this class of materials at low carrier densities of less than 1018 to 1019 cm−3 has been relatively well established, the physics at much higher carrier densities of 1020 to 1021 cm−3 remains poorly understood. In this transport regime there is on the order of one charge per molecular repeat unit, and naturally the transport is highly correlated because of the many-body Coulombic interactions between charges and dopant counter-ions, as well as between like charges.
In this study we investigate the transport physics of polymer semiconductors at such high carrier densities, which has been experimentally made possible through the use of organic electrochemical transistor and the recently developed ion-exchange doping technique. Through conductivity, Seebeck, and photoemission experiments we demonstrate that in a class of p-type donor-acceptor polymer it is possible to fully empty the highest occupied molecular orbital (HOMO), and to reversibly access the second highest occupied molecular orbital (HOMO-1). Across such wide range of doping levels, field-effect transfer measurements present evidence for the formation of a frozen Coulomb gap at the Fermi level. We discuss how these novel transport insights could be used to optimise the thermoelectric power factors.
*The author acknowledges a PhD studentship from the Jardine Foundation and the Cambridge Trust. Research grants from the EPSRC, ERC, and the Royal Society are graciously acknowledged.
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