4/28/2023 0 Comments Aoi tsukasaqun lyAmbipolar Nickel Dithiolene Complex Semiconductors: From One- to Two-Dimensional Electronic Structures Based upon Alkoxy Chain Lengths. Masatoshi Ito, Tomoko Fujino, Lei Zhang, So Yokomori, Toshiki Higashino, Rie Makiura, Kanokwan Jumtee Takeno, Taisuke Ozaki, Hatsumi Mori.This article is cited by 200 publications. It provides guidelines for future molecular design. This empirical plot is the first time such a detailed study has been made on the onset of charge injection and transport for a class of organic semiconductors. This is seen across channel lengths ranging from 50−150 μm and using only gold as electrodes. Ambipolar transport prevails when molecules have HOMO/ LUMO levels within the aforementioned range. Specifically, we note that for octadecyltrimethoxysilane (OTS) treated substrates, with top contact gold electrodes, electron injection and transport occurs when the LUMO <−3.15 eV, while hole injection and transport ceases when the HOMO <−5.6 eV. Placed together, these 20 molecules allow us to chart the transition from OTFTs that display only hole transport, to ambipolar, to solely electron transport. We examine a series of functionalized acenes that collectively have their HOMOs range from −4.9 eV to −5.6 eV and LUMOs range from −2.8 eV to −3.7 eV, as measured by cyclic voltammetry. We investigate the relationship between the charge carrier type in organic thin film transistors (OTFTs) and molecular energy levels.
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