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Zinc oxide nanocrystalline electron transport layer preparation method thereof and electronic device

A technology of zinc oxide nanocrystals and electron transport layers, which is applied in the direction of electric solid-state devices, nanotechnology, electrical components, etc., and can solve the problems of reduced turn-on voltage, reduction, and not approaching the theoretical value

Active Publication Date: 2020-04-07
NANJING TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the turn-on voltage of the device using the ZnO electron transport layer has been greatly reduced compared with the common organic electron transport layer (such as TPBi), it is still not close to the theoretical value, and there is still room for further reduction.

Method used

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  • Zinc oxide nanocrystalline electron transport layer preparation method thereof and electronic device
  • Zinc oxide nanocrystalline electron transport layer preparation method thereof and electronic device
  • Zinc oxide nanocrystalline electron transport layer preparation method thereof and electronic device

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preparation example Construction

[0020] The invention provides a method for preparing a zinc oxide nanocrystal electron transport layer. After the zinc oxide nanocrystal solution is coated, the electron transport layer is prepared by standing in an environment with a humidity greater than 0% for a period of time.

[0021] In the prior art, when preparing the zinc oxide nanocrystal electron transport layer, it is usually placed at a relatively high temperature for annealing after the zinc oxide nanocrystal solution is coated. However, in the present invention, after the zinc oxide nanocrystal solution is coated, no annealing step is required, but the zinc oxide nanocrystal coating is left to stand for a period of time in an environment with a certain humidity, and the zinc oxide nanocrystal film slows down under the action of water vapor. Crystallization is conducive to improving the conductivity of the film layer and enhancing electron injection, thereby reducing the turn-on voltage of related electronic devic...

Embodiment 1

[0034] QLED positive device preparation:

[0035] S1.ITO glass cleaning

[0036] Put the ITO glass sheet with the number engraved on the back into a glass dish filled with ethanol solution, scrub the ITO surface with a cotton swab, and then use acetone, deionized water, and ethanol to sonicate for 10 minutes respectively, and blow dry with a nitrogen gun. Finally, Place the cleaned ITO glass sheet in oxygen plasma and continue cleaning for 10 minutes;

[0037] S2. Preparation of hole injection layer (Pedot:PSS)

[0038] The cleaned ITO glass sheet was spin-coated with Pedot:PSS in the air, the rotation speed was 3000r / min, and the spin-coating time was 45 seconds. After the spin-coating was completed, it was placed in the air for annealing. The annealing temperature was 150°C, and the annealing time was 30 minutes. After the annealing is completed, quickly transfer the sheet to a glove box with a nitrogen atmosphere;

[0039] S3. Hole transport layer (HTL) preparation

[0...

Embodiment 2

[0048] QLED positive device preparation:

[0049] Cleaning of S1.ITO glass: same as step S1 of embodiment 1;

[0050] S2. Preparation of hole injection layer (Pedot:PSS): same as step S2 of Example 1;

[0051] S3. Hole transport layer (HTL) preparation: same as step S3 of embodiment 1;

[0052] S4. Quantum dot luminescent layer (QDs) preparation: same as step S4 of embodiment 1;

[0053] S5. Preparation of electron transport layer: the sheet obtained in step S4 is spin-coated with zinc oxide nanocrystal solution (30mg / mL, solvent is ethanol) doped with Mg and surface modified with carboxylate ligands at a speed of 2000r / min, and spin-coated 45 seconds, and then leave the sheet in air with a humidity of 90% for 10 minutes;

[0054] S6. Electrode preparation: same as step S6 of Example 1.

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Abstract

The invention discloses a zinc oxide nanocrystalline electron transport layer and a preparation method thereof and an electronic device. The preparation method of the zinc oxide nanocrystalline electron transport layer comprises the following steps: after a zinc oxide nanocrystalline solution is coated, standing the coating for a period of time in an environment of which the humidity is greater than 0%. In the present invention, after the zinc oxide nanocrystalline solution is coated and before annealing treatment is carried out, the zinc oxide nanocrystalline coating is allowed to stand for aperiod of time in an environment with a certain humidity, and a zinc oxide nanocrystalline film is slowly crystallized under the action of water vapor, so the improvement of the conductivity of the film layer and the enhancement of electron injection are facilitated, and the reduction of the turn-on voltage of related electronic devices is facilitated; and the zinc oxide nanocrystalline film is slowly crystallized under the action of water vapor, so that the interface bonding force between the electron transport layer and the adjacent functional layer is enhanced, and the service life of related electronic devices is prolonged.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to a zinc oxide nanocrystal electron transport layer, a preparation method thereof, and an electronic device. Background technique [0002] The arrangement of the electron transport layer is involved in fields such as solar cells or light emitting diodes. The material of the electron transport layer needs to have good charge transport ability. Zinc oxide is a direct bandgap semiconductor with a forbidden band width of 3.37eV, which behaves electrically as an n-type semiconductor with a resistivity as low as 10 -4 Ω / cm. Because of its excellent photoelectric properties, and by doping different metal elements and ions, its energy band position can be changed, so that electrons can be effectively injected. Qian Lei's research group used the sol-gel method to synthesize nano-zinc oxide with good crystallinity as the electron transport layer, which showed excellent performance. [0...

Claims

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Application Information

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IPC IPC(8): H01L51/56H01L51/50H01L51/54B82Y30/00
CPCB82Y30/00H10K50/16H10K2102/00H10K71/00
Inventor 高远谢松均陈涛陈超
Owner NANJING TECH CORP LTD
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