期刊
SMALL STRUCTURES
卷 2, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/sstr.202100024
关键词
dithienopyran; donor-acceptor copolymers; donor-donor copolymers; organic field-effect transistors; thermal stability
资金
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2018R1A2A1A05077194, 2021R1A2C3004202]
- Wearable platform Materials Technology Center - Korean Government (MSIT) [2016R1A5A1009926]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [2020M1A2A2080746]
- Ulsan City of UNIST (Ulsan National Institute of Science Technology) [1.210058.01]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019R1C1C1010426, 2019R1A4A1029052]
- National Research Foundation of Korea [2019R1C1C1010426, 2021R1A2C3004202, PAL-2021, 2019R1A4A1029052] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study introduces strong electron-rich fused-ring dithienopyran (DTP) unit into organic field-effect transistor (OFET) materials and synthesizes different types of copolymers based on it for device applications. The donor-acceptor (D-A) type copolymers show higher charge-carrier mobilities and better thermal stability compared to the donor-donor (D-D) type copolymers, attributed to enhanced crystalline features and preferential 3D-textured molecular orientation.
Although rapid and remarkable progress has been made in semiconducting polymers used in organic field-effect transistors (OFETs), the development of novel pi-conjugated backbones remains the central issue in this field. High FET mobilities have been achieved for copolymers based on fused-ring building blocks due to their strong tendency to form pi-pi stacks. However, introducing the recently formulated strong electron-rich fused-ring dithienopyran (DTP) unit in the polymer backbone has garnered considerably less attention. Herein, four new copolymers (donor-acceptor (D-A)-type versus donor-donor (D-D)-type structures) are synthesized based on the DTP unit by adopting different types of counterparts of the backbone. The characteristics of these copolymers, derived from different structural types, are investigated and compared and they are implemented in OFET devices. The D-A-type copolymers (P1 and P2) show higher charge-carrier mobilities and better thermal stability than the D-D-type copolymers (P3 and P4), attributed to enhanced crystalline features induced by strong intermolecular interactions and preferential 3D-textured molecular orientation of the D-A-type copolymers. Particularly, P1 exhibits the highest mobility of up to 0.22 cm(2) V-1 s(-1). This study provides a reference for understanding the influence of the backbone type on the structure-property relation and promotes the development of high-performance DTP-based copolymers.
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