Composite film and its preparation method and application
A composite thin film and thin film technology, applied in semiconductor/solid-state device manufacturing, organic semiconductor devices, electric solid-state devices, etc., can solve the problems of high hole injection potential barrier and poor energy level matching relationship, so as to improve device performance, enhance Barrier effect, cost reduction effect
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[0029] Correspondingly, a kind of preparation method of composite film comprises the following steps:
[0030] S01. Prepare nickel oxide colloidal solutions with different particle sizes of nano-nickel oxide respectively;
[0031] S02. Provide a substrate, and deposit the nickel oxide colloidal solution sequentially on the substrate according to the particle size of the nano-nickel oxide in the nickel oxide colloidal solution from small to large or from large to small, to prepare nano-nickel oxide. The N-layer nano-nickel oxide film whose particle size increases or decreases layer by layer is obtained to obtain a composite film, wherein the value range of N satisfies: 3≤N≤9.
[0032] The preparation method of the composite thin film provided by the embodiment of the present invention only needs to simply prepare nickel oxide colloidal solutions with different particle sizes and deposit them into films sequentially through a simple precipitation method, so that the energy level...
Embodiment 1
[0080] A kind of nano-nickel oxide composite film, its preparation method comprises the following steps:
[0081] First, an appropriate amount of nickel acetate is added to 50 ml of distilled water solvent to form a nickel salt solution with a total concentration of 0.1 mol / L. At the same time, an appropriate amount of potassium hydroxide powder is dissolved in another 50ml of distilled water solvent to form a lye with a concentration of 0.3mol / L. Then the nickel salt solution was heated to 50° C., and the potassium hydroxide solution was added dropwise until the pH value of the mixed solution reached 9 and stopped. After the infusion of the potassium hydroxide solution was completed, the mixed solution was stirred at 50° C. for 1 h to obtain a green turbid solution. The turbid solution was centrifuged at a speed of 7000 rpm, and the obtained green precipitate was mixed with 50 ml of distilled water solvent and stirred for 10 min, and then centrifuged again at a speed of 7000...
Embodiment 2
[0087] A kind of nano-nickel oxide composite film, its preparation method comprises the following steps:
[0088] First, an appropriate amount of nickel nitrate is added to 50 ml of distilled water solvent to form a nickel salt solution with a total concentration of 0.1 mol / L. At the same time, an appropriate amount of sodium hydroxide powder is dissolved in another part of 50ml distilled water solvent to form a lye with a concentration of 0.3mol / L. Subsequently, the nickel salt solution was kept at room temperature, and the sodium hydroxide solution was added dropwise until the pH value of the mixed solution reached 10 and stopped. After the instillation of the sodium hydroxide solution was completed, the mixed solution was stirred at room temperature for 30 min to obtain a green turbid solution. The cloudy solution was centrifuged at a speed of 7000 rpm, and the obtained green precipitate was mixed with 50 ml of ethanol solvent and stirred for 10 min, and then centrifuged a...
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