Facile Synthesis of Triphenylamine Based Hyperbranched Polymer for Organic Field Effect Transistors

Chinna Bathula; Alfred Bekoe Appiagyei; Hemraj Yadav; Ashok Kumar K; Sivalingam Ramesh; Nabeen K Shrestha; Surendra Shinde; Hyun-Seok Kim; Heung Soo Kim; Lebaka Veeranjaneya Reddy; Arifullah Mohammed

doi:10.3390/nano9121787

Facile Synthesis of Triphenylamine Based Hyperbranched Polymer for Organic Field Effect Transistors

Nanomaterials (Basel). 2019 Dec 16;9(12):1787. doi: 10.3390/nano9121787.

Affiliations

¹ Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Korea.
² Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul 04620, Korea.
³ Department of Mechanical, Robotics and Energy Engineering, Dongguk University-Seoul, Seoul 04620, Korea.
⁴ Division of Physics and Semiconductor Science, Dongguk University-Seoul, Seoul 04620, Korea.
⁵ Department of Biological and Environmental Science, Dongguk University, Biomedical Campus, Ilsandong, Seoul 10326, Korea.
⁶ Department of Food Science and Technology, Yeungnam University, Gyeongsan 712-749, Korea.
⁷ Department of Microbiology, Yogi Vemana University, Kadapa (A.P.) 516003, India.
⁸ Institute of Food Security and Sustainable Science (IFSSA), Universiti Malaysia Kelantan Campus Jeli, Locked Bag 100, Jeli 17600, Kelantan, Malaysia.

Abstract

In this study, we reported the synthesis and characterization of a novel hyperbranched polymer (HBPs) tris[(4-phenyl)amino-alt-4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene] (PTPABDT) composed of benzo[1,2-b:4,5-b']dithiophene (BDT) and triphenyleamine (TPA) constituent subunits by A₃ + B₂ type Stille's reaction. An estimated optical band gap of 1.69 eV with HOMO and LUMO levels of -5.29 eV and -3.60 eV, respectively, as well as a high thermal stability up to 398 °C were characterized for the synthesized polymer. PTPABDT fabricated as an encapsulated top gate/bottom contact (TGBC), organic field effect transistors (OFET) exhibited a p-type behavior with maximum field-effect mobility (µmax) and an on/off ratio of 1.22 × 10^-3 cm² V^-1 s^-1 and 7.47 × 10², respectively.

Keywords: OFET; Stille reaction; benzo[1,2-b:4,5-b’]dithiophene; triphenylamine.