Preparation method of fluorene block thiophene cathode interface layer containing silane terminal group

Abstract

The invention discloses a preparation method of a fluorene block thiophene cathode interface layer containing a silane terminal group. The preparation method comprises the steps: firstly, carrying outtransfer coupling polymerization on 9,9-bis(2'-(2'-(2'-methoxyl)ethyoxyl)ethyl)-2,7-dibromofluorene and 3-(6-((2,5- dibromothiophene)-3-methoxyhexyl)-1,1,1,3,5,5,5-hexamethylsilane by using a Kumadacatalyst to obtain a target block polymer PFEO-b-PTSi; and settling the polymer by using n-hexane, extracting the polymer by using a Soxhlet extractor, passing a column by using neutral alumina, and drying the polymer to obtain a faint yellow fluffy solid. A side chain contains a polar oxyalkyl chain and a siloxyl chain, so that the block polymer is not only capable of realizing the processing ofa polar solvent such as water and alcohols and reducing the work functions, good in mechanical performance and environment-friendly, but also capable of improving the shape of an active layer on an upper layer. The fluorene block thiophene cathode interface layer containing silane terminal group can be used as an excellent cathode interface layer of a device such as an organic photovoltaic cell, alight emitting diode and an FET.

Description

technical field [0001] The invention relates to the technical field of cathode interface of organic solar cells, in particular to a preparation method of a fluorene block thiophene cathode interface layer containing silane end groups. Background technique [0002] With the increasingly severe global environmental pollution and scarcity of resources, it is imminent to develop renewable and clean energy. Among all renewable energy sources, solar energy stands out for its advantages of abundant resources, cleanliness, and limited geographical location. At present, the commercialized solar cells are mainly inorganic silicon solar cells, but due to the complex production process, expensive production equipment, limited silicon materials, and the conversion efficiency has basically reached the limit, its further large-scale commercialization is subject to greater challenges. limit. However, organic thin-film solar cells are favored by scholars at home and abroad because they can...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above prior art, the present invention provides a method for preparing a fluorene block thiophene cathode interface layer containing silane end groups; the existing cathode interface layer is a random or alternating conjugated polymer electrolyte, rich in These cathode interfacial layers cannot simultaneously solve the problems of large interfacial barrier between the active layer and the electrode, poor morphology of the upper active layer and poor mechanical properties of the interfacial layer.

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