High Mobility and ON/OFF Ratio of Solution-Processable p-Channel OFETs from Arylacetylene End-Capped Alkoxyphenanthrenes

Balu Balambiga; Paneerselvam Devibala; Predhanekar Mohamed Imran; Nattamai S P Bhuvanesh; Samuthira Nagarajan

doi:10.1002/cphc.202200350

High Mobility and ON/OFF Ratio of Solution-Processable p-Channel OFETs from Arylacetylene End-Capped Alkoxyphenanthrenes

Chemphyschem. 2022 Dec 5;23(23):e202200350. doi: 10.1002/cphc.202200350. Epub 2022 Sep 6.

Authors

Balu Balambiga¹, Paneerselvam Devibala¹, Predhanekar Mohamed Imran², Nattamai S P Bhuvanesh³, Samuthira Nagarajan¹

Affiliations

¹ Organic Electronics Division, Department of Chemistry, Central University of Tamil Nadu, Thiruvarur, 610 005, India.
² Department of Chemistry, Islamiah College, Vaniyambadi, 635 752, India.
³ Department of Chemistry, Texas A&M University, College Station, Texas, 77842, USA.

PMID: 35867609
DOI: 10.1002/cphc.202200350

Abstract

New arylacetylene end-capped alkoxyphenanthrenes were synthesized and demonstrated as the best active layer for solution-processable p-channel organic field-effect transistors. The alkoxy chain embedded compounds exhibited enhanced solubility and induced non-covalent interactions resulting in effective molecular packing. The 'Lewis soft' heteroatoms direct the most stable conformation with dihedral angles possible for molecular interactions, and energy levels. DFT studies supported the fine-tuning of FMOs, with high HOMO levels ∼-5.2 eV ensuring a low barrier for charge injection. OFET devices exhibited a maximum charge carrier mobility up to 1.30 cm² /Vs with the highest ON/OFF ratio of 10⁷ . The strong π-π interactions and the crystallinity of the films are well supported by GIXRD and SEM analysis.

Keywords: OFETs; acetylene linkers; organic semiconductors; phenacenes; phenanthrene.

Abstract

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