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A kind of ultra-thin strip micron-scale organic small molecule single crystal and its preparation method and application

A small molecule, organic technology, applied in the field of organic small molecule single crystal materials, can solve the problems of affecting device performance, easy agglomeration of single crystals, deterioration of single crystal quality, etc., and achieve the effects of simple preparation process, good dispersibility, and easy control.

Active Publication Date: 2018-12-11
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the single crystal produced by the physical vapor deposition method is small, which cannot meet the requirements for the preparation of single crystal devices
The disadvantages of the single crystal prepared by the solution method are: 1) the single crystal is easy to agglomerate and the dispersion is poor, it is difficult to prepare a single crystal device based on a single single crystal, which is not conducive to the study of the intrinsic properties of the single crystal device; 2) the preparation process takes a long time , often takes hours or even days; 3) Due to the high boiling point of the solvent used, it needs to be heated and annealed to completely volatilize the solvent, but the organic small powder is easy to crack when the single crystal is above 60°C, so the annealing causes the quality of the single crystal to decline. Thus affecting the performance of the device; 4) The thickness of the single crystal is not less than 1 micron. The thickness of the single crystal directly affects the efficiency of carrier injection from the electrode to the channel of the active layer. The greater the thickness, the lower the efficiency, thereby reducing the possibility of high mobility devices sex

Method used

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  • A kind of ultra-thin strip micron-scale organic small molecule single crystal and its preparation method and application
  • A kind of ultra-thin strip micron-scale organic small molecule single crystal and its preparation method and application
  • A kind of ultra-thin strip micron-scale organic small molecule single crystal and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0041] Dissolve 3 mg of tips-pentacene in 3 mL of acetone, heat to 50 °C, as figure 1 As shown, before heating, there are still a large amount of tips-pentacene that is not dissolved in acetone solvent, and it is completely dissolved after heating, and then cooled to room temperature, small molecules are precipitated and self-assembled into seed crystals. Take 30 microliters of the solution and drop it on SiO with a thickness of 300nm 2 On a 2×2 cm Si wafer of the dielectric layer, the substrate temperature is 4°C, the solvent is volatilized, and the solvent is completely volatilized after 6 minutes, and an ultra-thin large-sized ribbon-shaped tips-pentacene single crystal is obtained, and its morphology is observed with an optical microscope as follows: figure 2 As shown, the length of the single crystal is 600-700 μm, and the width is 60-70 μm. It can be seen that the dispersion of the single crystal is good. The single crystal structure was measured by X-ray diffractomete...

Embodiment 2

[0043] Dissolve 3mg of tips-pentacene in 3mL of acetone and heat to 50°C until completely dissolved. After cooling to room temperature, small molecules were precipitated and self-assembled into seed crystals. Take 30 microliters of the solution containing the seed crystal and drop it on SiO with a thickness of 300 nm 2 On a 2×2cm Si sheet of the dielectric layer, cool to 25°C, and after 2 minutes, the solvent is completely volatilized, and a thin single crystal with good dispersion is obtained. The morphology is observed with an optical microscope as follows: Image 6 shown. The length of the single crystal prepared in this embodiment is 100-200 μm, the width is 15-20 μm, and the thickness is 75-90 nm.

Embodiment 3

[0045] Dissolve 9mg of tips-pentacene in 3mL of acetone and heat to 55°C until completely dissolved. After cooling to room temperature, small molecules were precipitated and self-assembled into seed crystals. Take 30 microliters of the solution containing the seed crystal and drop it on SiO with a thickness of 300 nm 2 Cool to 25° C. on a 2×2 cm Si sheet of the dielectric layer, wait for the solvent to evaporate completely after 1 minute, and obtain a thin single crystal with good dispersibility. The length of the single crystal prepared in this embodiment is 500-600 μm, the width is 40-55 μm, and the thickness is 160-180 nm.

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Abstract

The invention provides an ultra-thin strip-shaped micron-scale organic small molecule single crystal and its preparation method and application. The method is: dissolving the organic small molecule in a low-boiling solvent to obtain a supersaturated solution, and cooling down to obtain a self-assembled small molecule The organic small molecule solution of the seed crystal is prepared on the low-temperature substrate to obtain the organic small molecule single crystal. The preparation method of the present invention does not require annealing, and can prepare ultra-thin micron-scale organic small molecule single crystals with good dispersion in a short period of time. The method is carried out at relatively low temperature and normal pressure, and the preparation process is simple and easy to control. fitness. The prepared organic small molecule single crystal has large size and small thickness, good dispersion and no cracking, and can be used to prepare single crystal field effect transistors to obtain high mobility.

Description

technical field [0001] The invention belongs to the technical field of organic small molecule single crystal materials, and relates to a method for preparing an organic small molecule single crystal, in particular to a method for preparing an ultrathin strip-shaped micron scale organic small molecule single crystal. Background technique [0002] Compared with thin-film transistors of the same material, organic single-crystal field-effect transistors have the characteristics of no grain boundaries and fewer defects, and are widely used to study the intrinsic transport properties of organic materials. At the same time, the preparation of organic single-crystal field-effect transistors is also a method to obtain high-mobility devices. [0003] In the prior art, methods for preparing small organic molecule single crystals mainly include physical vapor deposition and solution methods. The size of the single crystal produced by the physical vapor deposition method is small, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/08C30B29/54H01L51/30
CPCC30B7/08C30B29/54H10K85/00
Inventor 江潮阿提卡·阿莱巴董骥
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA