Selenium Substitution in Bithiophene Imide Polymer Semiconductors Enables High-Performance n-Type Organic Thermoelectric

Li, Jianfeng1; Liu, Min2; Yang, Kun3; Wang, Yimei1; Wang, Junwei1; Chen, Zhicai1; Feng, Kui1; Wang, Dong4; Zhang, Jianqi5; Li, Yongchun1; Guo, Han1; Wei, Zhixiang5; Guo, Xugang1

2023-03-01

10.1002/adfm.202213911

ADVANCED FUNCTIONAL MATERIALS   Impact Factor & Quartile

1616-301X

1616-3028

Designing n-type polymers with high electrical conductivity remains a major challenge for organic thermoelectrics (OTEs). Herein, by devising a novel selenophene-based electron-deficient building block, the pronounced advantages of selenium substitution in simultaneously enabling advanced n-type polymers is demonstrated with high mobility (approximate to 2 orders of magnitude higher versus their sulfur-based analogues due to both intensified intra- and inter-chain interactions) and much improved n-doping efficiency (enabled by the largely lowered LUMO level with a approximate to 0.2 eV margin) of the resulting polymers. Via side chain optimization and donor engineering, the selenium-substituted polymer, f-BSeI2TEG-FT, achieves a highest conductivity of 103.5 S cm(-1) and power factor of 70.1 mu W m(-1) K-2, which are among the highest values reported in literature for n-type polymers, and f-BSeI2TEG-FT greatly outperformed the sulfur-based analogue polymer by 40% conductivity increase. These results demonstrate that selenium substitution is a very effective strategy for improving n-type performance and provide important structure-property correlations for developing high-performing n-type OTE materials.

electrical conductivity n-doping organic thermoelectric polymer semiconductors selenium substitutions

SCI

English

First ; Corresponding

National Natural Science Foundation of China["22135001","52173171","22005133"] ; Shenzhen Science and Technology Innovation Commission[JCYJ20220818100617037] ; Guangdong Basic and Applied Basic Research Foundation["2022A1515110635","2022A1515010935"] ; China Postdoctoral Science Foundation[2021M701550]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000950360000001

WILEY-V C H VERLAG GMBH

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol SUSTech, Dept Mat Sci & Engn, 1088, Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
2.Huizhou Univ, Sch Chem & Mat Engn, Huizhou 516001, Guangdong, Peoples R China
3.Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China
4.Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen Key Lab Adv Mat, Shenzhen 518055, Peoples R China
5.Chinese Acad Sci, CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China

Li, Jianfeng,Liu, Min,Yang, Kun,et al. Selenium Substitution in Bithiophene Imide Polymer Semiconductors Enables High-Performance n-Type Organic Thermoelectric[J]. ADVANCED FUNCTIONAL MATERIALS,2023.

Li, Jianfeng.,Liu, Min.,Yang, Kun.,Wang, Yimei.,Wang, Junwei.,...&Guo, Xugang.(2023).Selenium Substitution in Bithiophene Imide Polymer Semiconductors Enables High-Performance n-Type Organic Thermoelectric.ADVANCED FUNCTIONAL MATERIALS.

Li, Jianfeng,et al."Selenium Substitution in Bithiophene Imide Polymer Semiconductors Enables High-Performance n-Type Organic Thermoelectric".ADVANCED FUNCTIONAL MATERIALS (2023).