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Investigating the Thermal Stability of Organic Thin‐Film Transistors and Phototransistors Based on [1]‐Benzothieno‐[3,2‐ b ]‐[1]‐benzothiophene Dimeric Derivatives
Author(s) -
He Yu,
Guo Shenghui,
He Yaowu,
Murtaza Imran,
Li Aiyuan,
Zeng Xianzhe,
Guo Yitong,
Zhao Yang,
Chen Xiaolong,
Meng Hong
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201803542
Subject(s) - benzothiophene , thermal stability , chemistry , materials science , organic chemistry , thiophene
Two new highly thermally stable [1]benzothieno[3,2‐ b ][1]benzothiophene (BTBT) dimeric derivatives, namely 1,4‐bis([1]benzothieno[3,2‐ b ][1]benzothiophene‐2‐yl)benzene (BTBT‐Ph‐BTBT) and 4,4′‐bis([1]benzothieno[3,2‐ b ][1]benzothiophene‐2‐yl)‐1,1′‐biphenyl (BTBT‐DPh‐BTBT), were synthesized by combining two simple fragment structures. Compared to the monomer compound 2‐phenyl[1]benzothieno[3,2‐ b ][1]benzothiophene (Ph‐BTBT, μ max =3.4×10 −2 cm 2 V −1 s −1 ), the organic thin‐film transistors (OTFTs) based on BTBT‐Ph‐BTBT and BTBT‐DPh‐BTBT showed significantly higher mobility (up to 2.5 and 3.6 cm 2 V −1 s −1 for BTBT‐Ph‐BTBT and BTBT‐DPh‐BTBT, respectively). The mobility of OTFTs based on BTBT‐Ph‐BTBT was kept at a high value (2.4×10 −1 cm 2 V −1 s −1 ) after the devices were thermally annealed at 350 °C. Furthermore, the organic phototransistors (OPTs) based on BTBT‐Ph‐BTBT and BTBT‐DPh‐BTBT displayed high photosensitivities in a range of 250–400 nm with a low intensity, making these materials potentially applicable for sensitive optoelectronic devices.