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Title:High charge carrier mobility in thin films of quasi-two-dimensional polyacetylenes with sulphuric inter-chain linkers
Authors:ID Pastukhova, Nadiia (Author)
ID Bratina, Gvido (Author)
ID Pavlica, Egon (Author), et al.
Work type:Unknown
Typology:1.12 - Published Scientific Conference Contribution Abstract
Organization:UNG - University of Nova Gorica
Abstract:Quasi-two-dimensional conjugated polymers (q2DCP) have been described and recognised as crystalline, one- or two-layer polymer nanosheets prepared by arranging linear conjugated polymer chains in a 2D plane via non-covalent interchain interactions.[1,2] The extension of polymer dimensionality to two dimensions improves the alignment of individual polymer layers and overcomes the limitations associated with charge carrier hopping between polymer chains in one-dimensional and crosslinked polymers [3] Compared to other two-dimensional materials such as graphene or transition metal dichalcogenides, q2DCPs offer a high degree of flexibility in chemical design and are compatible with liquid-based processing methods. Various q2DCPs have been synthesized by surface active monolayer-assisted interfacial synthesis (SMAIS) [5] The photoreaction of these materials is of particular interest due to their tunable properties such as band gap and associated wavelength-dependent photoexcitation, which enables a wide range of applications in optoelectronic devices. Using time-of-flight photoconductivity measurements (TOF-PC) [4], we investigate the charge transport properties of 2D polyacetylene prepared by the SMAIS method. A typical TOFP measurement of q2D polyacetylene is shown in Figure 1, using a focused nanosecond pulse laser at 325 nm and an electrode spacing of 250 µm. From the polarity of the bias voltage and the duration of the photocurrent, we can determine the polarity, velocity, and mobility of the photo-excited carriers as a function of the applied bias voltage and excitation wavelength. and observed electron mobility of 250 cm2/Vs, which is in the range of the most advanced organic single-crystal small-molecule semiconductors and almost an order of magnitude higher than linear polymeric semiconductors. We investigated the optical absorption and transmission on a lateral scale using scanning near-field optical microscopy (SNOM).
Keywords:2D polymers, organic semiconductors, q2DPA, SNOM, time-of-flight photoconductivity
Publication status:Published
Publication version:Version of Record
Year of publishing:2023
Number of pages:1 str.
PID:20.500.12556/RUNG-8950 New window
COBISS.SI-ID:190139651 New window
Publication date in RUNG:25.03.2024
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Record is a part of a monograph

Title:Graphene Week : 4.-8. Sep. 2023, Gothenburg, Sweden
Place of publishing:[S. l.
Publisher:s. n.
Year of publishing:2023
COBISS.SI-ID:190136579 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:Z1-3189
Name:Transportne lastnosti dvodimenzionalnih konjugiranih polimerov