Method for preparing polyamine branched chain containing perylene bisimide cathode interface layer

Abstract

The invention discloses a method for preparing a polyamine branched chain containing perylene bisimide cathode interface layer. The polyamine branched chain perylene bisimide derivative can be prepared through a step of a simple substitution reaction. The method comprises the following steps: by taking imidazole as a solvent, adding a catalysis amount of zinc acetate, performing a backflow reaction on 3,4,9,10-tetracarboxylic dianhydride and tetraethylene pentamine over night; after the reaction is completed, cooling to a room temperature, adding a great amount of acetone, stirring for three hours, filtering off imidazole and tetraethylene pentamine which is not completely reacted, filtering filtrate, dissolving the filtrate with methanol, performing spinning drying on a solvent by using aneutral aluminum oxide column, and drying in vacuum, thereby obtaining a purple solid product. As a branch chain comprises polyamine, environmental-friendly polar solvent processing such as water / alcohol can be achieved by using the n-shaped perylene bisimide derivative, the work function can be reduced, the morphology of an upper active layer can be improved, and the problem of interface thickness sensitivity can be solved. The cathode interface layer can be used as a cathode interface layer of devices such as photovoltaic cells, LEDs and FETs in large-scale printing production.

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 peryleneimide cathode interface layer containing polyamine branched chains. Background technique [0002] With the increasing global environmental pollution and energy crisis, the development of new renewable energy is imminent. Compared with other renewable energy, solar energy has many advantages, such as abundant resources, clean and pollution-free, and less restricted by geographical location. Due to the complex production process, expensive production equipment, limited silicon materials, and the conversion efficiency has basically reached the limit of the current commercial inorganic silicon battery, its further large-scale commercialization is greatly restricted. On the contrary, solution-processable organic photovoltaic cells have been favored by scholars because of their low cost, low price and large-area printin...

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the invention provides a kind of preparation method of the perylene imide cathode interfacial layer containing polyamine branches; the existing cathode interfacial layer is random or alternating conjugated polymer electrolyte, Fullerene derivatives and inorganic zinc oxide, etc., these reported cathode interfacial layers cannot simultaneously solve the active layer morphology, interfacial barrier and interfacial layer thickness sensitivity issues.

Therefore, the design of peryleneimide derivatives containing tetraethylenepentamine branches as the cathode interface layer can simultaneously solve the problems of large interface barrier between the active layer and the electrode, poor morphology of the upper active layer, and sensitivity to the thickness of the interface layer. , and the n-type self-doping effect can be cleverly used to further reduce the interface barrier, and finally improve the photoelectric conversion efficiency of the device

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