Preparation method for transparent organic and inorganic hybridization heterojunction material

Abstract

The invention discloses a transparent organic and inorganic hybridization heterojunction material and a preparation method thereof. According to the heterojunction material, alkylthrophene-pyridine copolymer which is used as a p-type semiconductor material and II-VI group inorganic nanocrystalline which is used as an n-type semiconductor material are assembled in a solution, and then a film is formed by a spin coating, casting or printing method; and room-temperature large-area forming can be realized. The prepared hybridization heterojunction is ordered in structure and high in light absorption efficiency, dispersion stability and interfacial compatibility. Films formed by the hybridization heterojunction materials are high in light transmission and can widely used as materials of various active coatings in semiconductor photoelectric devices.

Description

technical field [0001] The invention belongs to the field of photoelectric device materials, and in particular relates to a transparent organic-inorganic hybrid heterojunction material and a preparation method thereof. Background technique [0002] Semiconductor optoelectronic devices can realize the exchange of light and electricity and are widely used in information, lighting, energy and other fields. The commonly used materials are semiconductor silicon, germanium, inorganic compounds, etc., which can be manufactured by interfacial alloys, epitaxial growth, vacuum deposition and other technologies. Heterojunction has the disadvantages of high cost, complex process, toxicity in the manufacturing process, and difficult flexible processing. Conjugated polymers have the advantages of light weight, flexibility, low cost, and can be chemically modified to control their properties. They can be formed into large-area films by solution spin coating, casting, etc., and show great p...

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Problems solved by technology

The energy conversion efficiency of hybrid heterojunction cells prepared by thiophene derivatives and inorganic acceptor materials has reached more than 7%. Most of the hybrid heterojunctions prepared by thiophene derivatives and inorganic semiconductors in current literature reports are physically blended ( U.S. Patent 7777303, Chinese Patent 101029142A, J.Phys.Chem.C, 2012, 116, 3153, etc.), this method cannot solve the problem of organic-inorganic two-phase compatibility, and inorganic nanocrystals are easy to agglomerate, which hinders the transmission of electrons. The phase separation between phases also affects the separation and transmission of excitons at the interface, making it difficult to fully exert its photoelectric properties

In order to solve the dispersion problem of inorganic nanocrystalline materials in conjugated polymer solutions, the introduction of polar functional groups into the conjugated polymer molecular chain can improve the dispersion stability of inorganic nanocrystals in conjugated polymer solutions, which is beneficial to the interface charge. Separation and transfer (as reported in the document J.Am.Chem.Soc.2004,126,6550), the reaction conditions of this type are usually harsh, and the introduction of polar functional groups has a negative impact on the photophysical properties of organic conjugated polymers and in organic solvents. There are adverse effects on the solubility and other aspects of

It is also possible to improve the dispersion and stability of nanocrystals by organically modifying the surface of nanocrystals, but it also becomes an insulating layer in optoelectronic devices that hinders the transfer of charges between donors and acceptors. The chelation exchange of such organic modifiers is a relatively effective method (as reported in the literature J.Phys.Chem.C, 2010, 114, 12784), but it has not played a role in improving the interface properties with polythiophene derivatives. to significant effect

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