LED based on two-dimensional perovskite single crystals and preparation method of LED
A perovskite, single crystal technology, applied in semiconductor/solid-state device manufacturing, electrical components, electrical solid-state devices, etc., to achieve the effect of improving environmental stability and improving injection efficiency
Active Publication Date: 2020-06-09
SHANGHAI NATLINEAR ELECTRONICS CO LTD
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[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a LED based on a two-dimensional perovskite single crystal and its preparation method, which is used to solve the environmental stability faced by the perovskite LED in the prior art and the problem of electro-optical conversion efficiency
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preparation example Construction
[0060] refer to image 3 and Figure 4 , this embodiment also provides a method for preparing a LED based on a two-dimensional perovskite single crystal, which specifically includes the following steps:
[0061] Provide the substrate;
[0062] forming a negative electrode on the substrate;
[0063] forming an electron injection layer on the negative electrode;
[0064] A two-dimensional perovskite single crystal composite structure is formed on the electron injection layer, the two-dimensional perovskite single crystal composite structure includes M stacked two-dimensional perovskite single crystals, M≥2; the two-dimensional The perovskite single crystal includes N layers of two-dimensional perovskite single layer, N≥2; the two-dimensional perovskite single layer includes n layers of corner-sharing lead halide octahedron, n-1 layer of organic ligand A and 2 layers Organic ligand B, n≥1, the organic ligand A is embedded in the gap of the angle-sharing lead halide octahedron...
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Abstract
The invention provides an LED based on two-dimensional perovskite single crystals and a preparation method of the LED. The LED is characterized in that a two-dimensional perovskite single crystal composite structure comprises M stacked two-dimensional perovskite single crystals, wherein M is greater than or equal to 2; the two-dimensional perovskite single crystal comprises N two-dimensional perovskite single layers, wherein N is greater than or equal to 2; the two-dimensional perovskite single layer comprises n layers of common-angle lead halide octahedrons, n-1 layers of organic ligands A and 2 layers of organic ligands B, n is greater than or equal to 1, the chemical formula of the two-dimensional perovskite single layer is B2A<n-1>PbnX<3n+1>, X is a halogen element, and the number of carbon atoms of the organic ligands B is greater than that of the organic ligands A; and the two-dimensional perovskite single layers in the same two-dimensional perovskite single crystal have the samen value, and the n value of the two-dimensional perovskite single crystal far away from an electron injection layer is greater than the n value of the two-dimensional perovskite single crystal closeto the electron injection layer. The LED has the advantages of high injection efficiency, high environmental stability and high electro-optical conversion efficiency.
Description
technical field [0001] The invention belongs to the field of semiconductor devices, and relates to an LED based on a two-dimensional perovskite single crystal and a preparation method thereof. Background technique [0002] Benefiting from the high fluorescence quantum yield and electron mobility, 3D perovskites can be widely used in electro-optic devices such as LEDs. With the continuous improvement of the efficiency of 3D perovskite LEDs, their stability has also received more and more attention. Two-dimensional perovskites have better moisture resistance than three-dimensional perovskites, making the environmental stability of two-dimensional perovskites much higher than that of three-dimensional perovskites. [0003] At present, LEDs and solar cells based on composite two-dimensional perovskite have been successfully developed, but there are a large number of interface defects in the composite two-dimensional perovskite film prepared by spin-coating method, which will tr...
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IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K85/30H10K50/11H10K71/00
Inventor 蒋小强何云许剑刘桂芝
Owner SHANGHAI NATLINEAR ELECTRONICS CO LTD