A kind of preparation method of hyperbranched sodium sulfonate small molecule electron transport layer

Abstract

The invention discloses a preparation method of a hyperbranched sodium sulfonate small-molecule electron transport layer. The hyperbranched sodium sulfonate small-molecule electrolyte can be prepared through a one-step simple reaction. First, tetraethylenepentamine was added to the dry tetrahydrofuran solution, NaH was added under ice bath and nitrogen atmosphere, stirred at room temperature for 2 hours, then the reaction solution was raised to 50°C for overnight reaction, and excess was added through a constant pressure dropping funnel. 1,4-butane sultone, cooled to room temperature after the reaction, suction filtered, and the filter residue was collected. The obtained filter residue was dissolved in deionized water and purified by dialysis with a dialysis bag with a pore size of 1000 to obtain the light yellow target product PNSO 3 Na. Due to the existence of hyperbranched side chain polar groups, endowing this small molecule can not only realize the processing of environmentally friendly polar solvents such as water and alcohol, but also form interface dipoles, reduce the work function, and improve the interface contact. It can be used as a good cathode interface layer for devices such as photovoltaic cells, LEDs and FETs.

Description

technical field [0001] The invention relates to the technical field of electron transport layers of organic solar cells, in particular to a preparation method of hyperbranched sodium sulfonate small molecule electron transport layers. Background technique [0002] With the increasing global environmental pollution and energy crisis, it is imminent to develop new renewable energy. Among the many renewable energies, solar energy is unique, with the advantages of abundant resources, cleanliness and universality. Due to the complex production process, expensive production equipment, limited silicon materials, and the conversion efficiency has basically reached the limit of traditional inorganic silicon solar cells, it limits its further industrialization and expansion of production. On the contrary, organic polymer solar cells have the advantages of high quality, low cost, solution printing production and controllable structure, which have aroused widespread interest of scholar...

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Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the invention provides a preparation method of hyperbranched sodium sulfonate small molecule electron transport layer; the existing electron transport layer is random or alternating conjugated polymer electrolyte, fullerene derivative , small molecule electrolytes and inorganic zinc oxide, etc., these electron transport layers cannot solve the problem of active layer morphology and interface barrier at the same time and achieve environmental friendly processing and simple preparation process

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