High-performance, low-voltage organic field-effect transistors using thieno[3,2-b]thiophene and benzothiadiazole co-polymers

Bibi Amna, Recep Isci, Humaira M. Siddiqi, Leszek A. Majewski, Sheida Faraji*, Turan Ozturk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


A series of new linear conjugated co-polymers, incorporating different substituted thieno[3,2-b]thiophenes (TTs) as the donor, acetylene as the π-bridge and benzothiadiazole (BT) as the acceptor units, were synthesized via palladium-catalyzed Sonogashira cross-coupling polymerization. The optical, electrochemical, and thermal properties of these conjugated polymers were evaluated via UV-vis, fluorescence, cyclic voltammetry, and thermogravimetric analysis. These readily soluble TT-BT co-polymers were employed as the semiconducting channel materials in bottom-gate, top-contact (BGTC) organic field-effect transistors (OFETs). The OFET devices showed p-channel field-effect behavior and successfully operated below −3 V in high yield. The polymeric materials comprising TTs with aliphatic side chains exhibited a better OFET performance compared with those with aromatic side chains. The OFETs using TT-BT with thienothiophene bearing a nonyl (C9H19) side chain showed the highest hole average carrier mobility in the saturation regime, μsat = 0.1 cm−2 V−1 s−1, on/off current ratio, ION/IOFF = 3.5 × 103, and the smallest subthreshold swing, SS < 200 mV dec−1. The observed differentiation in device characteristics can be beneficial in applications where selectivity is as essential as the field-effect behavior.

Original languageEnglish
Pages (from-to)8254-8265
Number of pages12
JournalJournal of Materials Chemistry C
Issue number21
Publication statusPublished - 27 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 The Royal Society of Chemistry.


We thank the Higher Education Council of Turkey (YOK) and TUBITAK grants to Recep Isci (PhD, 100/2000 YOK and 2211A BIDEP/TUBITAK), TGA-2021-42949 numbered ITU BAP Project, 118C365 numbered TUBITAK BIDEB 2232 Project and Unsped Global Lojistik, Turkey, for financial support.

FundersFunder number
Higher Education Council of Turkey
YOK2211A BIDEP/TUBITAK, TGA-2021-42949
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik Üniversitesi118C365


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