Preparation and application of down-conversion material of perovskite solar cell

Abstract

The invention belongs to the field of perovskite solar cells, and discloses preparation and application of a down-conversion material of a perovskite solar cell. The preparation method of the down-conversion material of the perovskite solar cell specifically comprises the following steps: dissolving biomass in water, and then adding hydrogen peroxide for reaction; after the reaction is finished, adding a nitrogen doping agent, and then transferring the mixed solution into a high-pressure kettle lined with Teflon for reaction; after the reaction is finished, NaBH4 is added for a reduction reaction, after the reaction is finished, the mixture is purified and dried into powder, and the sample is named as CD 2, namely the perovskite solar cell down-conversion material. The CD < 2 > / CNF mixed suspension is directly spin-coated on glass of a PSC photo-anode and then dried to obtain a thin composite film, so that ultraviolet rays are absorbed and converted into visible light. The CD 2 / CNF composite film can effectively delay the degradation of PSC and enhance the stability of light current.

Description

technical field [0001] The invention belongs to the field of perovskite solar cell (PSC), and particularly relates to the preparation and application of a perovskite solar cell down-conversion material. Background technique [0002] Perovskite solar cells are optoelectronic devices that can efficiently utilize clean solar energy, and research on their efficiency and stability is of great significance for sustainable development. Organic-inorganic hybrid perovskite cells (PSCs) have advantages such as high extinction coefficient, high carrier mobility, high defect tolerance factor, long exciton diffusion length, small exciton binding energy, and easy solution preparation. It can make full use of sunlight in the 300-800nm ​​band. But the UV instability of perovskite solar cells is an important issue. According to research reports, when perovskite solar cells are exposed to ultraviolet light, a certain amount of humidity and heat will degrade, which will lead to a decrease in...

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Problems solved by technology

However, in the current research, there are few reports on the application of carbon dots prepared from biomass raw materials to the down conversion layer.

For example, carbon dots prepared from corn flour are used as down-conversion materials, but the UV absorption properties of the carbon dots prepared from this raw material are poor and the fluorescence quantum yield is low; soybeans can also be used to prepare carbon dots for down-conversion materials, but The prepared carbon dots have poor ultraviolet absorption performance, weak fluorescence performance, quantum yield is only 7.14%, and the PCE of the battery device is low, only 7.97%.

These down-converted carbon dots prepared from biomass all have the problems of poor UV absorption ability and weak fluorescence performance, because the raw materials used in these studies have low carbon content and do not contain UV-absorbing functional groups. and other factors are not suitable for the preparation of carbon dots with high ultraviolet absorption and fluorescence properties, and in these studies, only simple hydrothermal method was used to prepare carbon dots, and no carbon dots were modified to improve the fluorescence properties of carbon dots

The above methods all have some deficiencies. The packaged battery has the common problem of being unable to effectively block ultraviolet rays. The method of using an ultraviolet filter layer to block ultraviolet rays cannot utilize ultraviolet rays.

However, the use of traditional inorganic down-conversion fluorescent materials has the problems of high price and harmful heavy metal elements. Although carbon dots prepared by using traditional raw materials can be used as down-conversion materials, they still have poor UV absorption performance and weak fluorescence performance. And other issues

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