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Issue 20, 2018
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Silicon phthalocyanines as N-type semiconductors in organic thin film transistors

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Abstract

Silicon phthalocyanines (SiPcs) represent a large class of molecules that have been studied as donors, acceptors and ternary additives in organic photovoltaics but not in organic thin-film transistors (OTFTs). We synthesized three novel SiPcs using axial substitution and examined their performance as the active layer in bottom-gate bottom-contact (BGBC) OTFTs. All three molecules exhibit N-type behaviour, with the dibenzoate substituted SiPc showing the greatest field-effect mobility of roughly 6 × 10−4 cm2 V−1 s−1 in vacuum. This performance improved to >0.01 cm2 V−1 s−1 when using a combination of dielectric modification with octadecyltrichlorosilane (ODTS) and a substrate temperature during deposition of 200 °C. These promising results point towards the possibility of high performance N-type SiPcs by exploring the wealth of available options in axial and peripheral substitution and careful process control during fabrication.

Graphical abstract: Silicon phthalocyanines as N-type semiconductors in organic thin film transistors

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Publication details

The article was received on 06 Mar 2018, accepted on 30 Apr 2018 and first published on 02 May 2018


Article type: Paper
DOI: 10.1039/C8TC01116H
Citation: J. Mater. Chem. C, 2018,6, 5482-5488
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    Silicon phthalocyanines as N-type semiconductors in organic thin film transistors

    O. A. Melville, T. M. Grant and B. H. Lessard, J. Mater. Chem. C, 2018, 6, 5482
    DOI: 10.1039/C8TC01116H

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