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Highly efficient modulation of the electronic properties of organic semiconductors by surface doping with 2D molecular crystals

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  • ReceivedFeb 4, 2020
  • AcceptedMay 6, 2020
  • PublishedMay 14, 2020

Abstract

Doping is a critically important strategy to modulate the properties of organic semiconductors (OSCs) to improve their optoelectrical performances. Conventional bulk doping involves the incorporation of foreign molecular species (i.e., dopants) into the lattice of the host OSCs, and thus disrupts the packing of the host OSCs and induces structural defects, which tends to reduce the mobility and (or) the on/off ratio in organic field-effect transistors (OFETs). In this article, we report a highly efficient and highly controllable surface doping strategy utilizing 2D molecular crystals (2DMCs) as dopants to boost the mobility and to modulate the threshold voltage of OFETs. The amount of dopants, i.e., the thickness of the 2DMCs, is controlled at monolayer precision, enabling fine tuning of the electrical properties of the OSCs at unprecedented accuracy. As a result, a prominent increase of the average mobility from 1.31 to 4.71 cm2 V−1 s−1 and a substantial reduction of the threshold voltage from −18.5 to −1.8 V are observed. Meanwhile, high on/off ratios of up to 108 are retained.


Funded by

the National Natural Science Foundation of China(51873148,61674116,51633006)

the Ministry of Science and Technology of China(2016YFA0202302)

the the Natural Science Foundation of Tianjin City(18JC-YBJC18400)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (51873148, 61674116, 51633006), the Ministry of Science and Technology of China (2016YFA0202302) and the Natural Science Foundation of Tianjin City (18JC-YBJC18400).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

These authors contributed equally to this work


Supplement

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    Schematic illustrations of the procedures for the preparation of microribbons of TIPS-pentacene and 2DMCs of C6-DPA. The preparation of uniaxial microribbons of TIPS-pentacene by the thermal-assisted self-assembly (TASA) approach (a–c). The growth of 2DMCs of C6-DPA (d, e). The transfer of the 2DMCs on the top of the uniaxial microribbons (f) (color online).

  • Figure 2

    (a, d, g) OM images of a 2DMC of C6-DPA, microribbons of TIPS-pentacene, and their combination (2DMCs on microribbons). (b, c, e, f, h, i) POM images of a 2DMC of C6-DPA, microribbons of TIPS-pentacene, and their combination (color online).

  • Figure 3

    (a–c) AFM images of a 2DMC of C6-DPA, microribbons of TIPS-pentacene, and their combination. (d, e) TEM image and the corresponding SAED patterns of a 2DMC of C6-DPA. (f, g) TEM image and the corresponding SAED patterns of a microribbon of TIPS-pentacene. XRD (h), PL spectra (i) and UV-Vis-NIR spectra (j) of 2DMCs of C6-DPA, microribbons of TIPS-pentacene, and their combination. The excitation wavelength was 380 nm in the PL spectra (color online).

  • Figure 4

    (a, d) Schematics of the bottom gate, top contact OFETs based on pristine and doped TIPS-pentacene. Typical transfer and output characteristics of OFETs based on pristine (b, c) and doped (e, f) TIPS-pentacene (color online).

  • Figure 5

    (a) Threshold voltages as a function of C6-DPA layer numbers; (b) mobilities as a function of C6-DPA layer numbers (color online).

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