Observation of Weak Counterion Size Dependence of Thermoelectric Transport in Ion Exchange Doped Conducting Polymers Across a Wide Range of Conductivities

被引：26

作者：

Chen, Chen ^{[1
]}

Jacobs, Ian E. ^{[1
]}

Kang, Keehoon ^{[2
]}

Lin, Yue ^{[1
]}

Jellett, Cameron ^{[3
]}

Kang, Boseok ^{[4
,5
,6
]}

Lee, Seon Baek ^{[4
]}

Huang, Yuxuan ^{[1
]}

Qarai, Mohammad Balooch ^{[7
]}

Ghosh, Raja ^{[7
]}

Statz, Martin ^{[1
]}

Wood, William ^{[1
]}

Ren, Xinglong ^{[1
]}

Tjhe, Dion ^{[1
]}

Sun, Yuanhui ^{[1
]}

She, Xiaojian ^{[8
]}

Hu, Yuanyuan ^{[9
]}

Jiang, Lang ^{[10
]}

Spano, Frank C. ^{[7
]}

McCulloch, Iain ^{[3
,11
]}

Sirringhaus, Henning ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Optoelect Grp, J Thomson Ave, Cambridge CB3 0HE, England

[2] Seoul Natl Univ, Res Inst Adv Mat, Dept Mat Sci & Engn, Seoul 08826, South Korea

[3] Imperial Coll London, Dept Chem, London SW7 2AZ, England

[4] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang 790784, South Korea

[5] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol, Suwon 16419, South Korea

[6] Sungkyunkwan Univ, Dept Nano Engn, Suwon 16419, South Korea

[7] Temple Univ, Dept Chem, Philadelphia, PA 19122 USA

[8] Zhejiang Univ, Coll Opt Sci & Engn, Int Res Ctr Adv Photon, State Key Lab Modern Opt Instrumentat, Hangzhou 310000, Peoples R China

[9] Hunan Univ, Sch Phys & Elect, Key Lab Micronano Optoelect Devices, Minist Educ, Changsha 410082, Peoples R China

[10] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China

[11] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Peoples R China

来源：

ADVANCED ENERGY MATERIALS | 2023年 / 13卷 / 09期

基金：

欧洲研究理事会; 新加坡国家研究基金会; 英国工程与自然科学研究理事会;

关键词：

counterion effect; doping; organic electronics; semicrystalline polymers; thermoelectrics; CHARGE-TRANSPORT; ORGANIC SEMICONDUCTORS; FILMS; DISORDER; POLARONS; OPTIMIZATION; BIPOLARONS; DRIVEN; FIGURE; MERIT;

D O I：

10.1002/aenm.202202797

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Conducting polymers are of interest for a broad range of applications from bioelectronics to thermoelectrics. The factors that govern their complex charge transport physics include the structural disorder present in these highly doped polymer films and the Coulombic interactions between the electronic charge carriers and the dopant counterions. Previous studies have shown that at low doping levels carriers are strongly trapped in the vicinity of the counterions, while at high doping levels charge transport is not limited by Coulombic trapping, which manifests itself in the conductivity being independent of the size of the dopant counterion. Here a recently developed ion exchange doping method is used to investigate the ion size dependence of a semicrystalline polythiophene-based model system across a wide range of conductivities. It is found that the regime in which the charge and thermoelectric transport is not or only weakly dependent on ion size, extends to surprisingly low conductivities. This surprising observation is explained by a heterogeneous doping that involves doping of the amorphous domains to high doping levels first before doping of the ordered, crystalline domains occurs. The study provides new insights into how the thermoelectric physics of conducting polymers evolves as a function of doping level.

引用

页数：15