Inversion perovskite solar cell containing alkali metal halide hole modification layer and preparation method thereof

Abstract

The invention discloses an inversion perovskite solar cell containing an alkali metal halide hole modification layer. The perovskite solar cell comprises a conductive substrate, a hole transport layer, a perovskite light absorption layer, an electron transport layer and a metal electrode which are stacked in sequence, wherein the hole transport layer is made of nickel oxide, a hole transport layermodification layer is further arranged between the hole transport layer and the perovskite light absorption layer, and the hole transport layer modification layer is made of alkali metal halide. Theinvention also provides a preparation method of the inversion perovskite solar cell containing the alkali metal halide hole modification layer. By adding the alkali metal halide hole modification layer, the adhesive force between the nickel oxide and the perovskite layer is enhanced, pinholes in the surface of the nickel oxide thin film are reduced, and the interface recombination loss of carriersis reduced, so the overall performance of the perovskite solar cell is effectively improved. The method for preparing the perovskite solar cell is simple and low in cost, and the performance of the perovskite solar cell is greatly improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to an inversion perovskite solar cell containing an alkali metal halide hole modification layer and a preparation method thereof. Background technique [0002] With the development of society, the shortage of resources and environmental pollution caused by traditional energy are becoming more and more serious. The development and utilization of clean and renewable energy has become one of the major subjects of scientific research. As the largest amount of renewable energy on the earth, solar energy has become an important research direction; at present, crystalline silicon solar cells with mature technology have high conversion efficiency and stability, but the SiO 2 The purity requirements of solar cells are very high, which makes their cost high; new solar cells have the characteristics of low cost, low energy consumption, and environmental friendliness, and have been favored ...

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Problems solved by technology

The expensive price will make its large-scale preparation and commercialization more difficult. Therefore, the more stable and cheaper nickel oxide (NiO x ) has become an alternative hole-transporting material; however, the conductivity of nickel oxide is far inferior to that of Spiro-OMeTAD, and its conductivity can be improved by doping metal elements; on the one hand, there are a large number of pinholes on the surface of nickel oxide film, and on the other hand On the one hand, the adhesion between nickel oxide and perovskite is weak, and the interfacial recombination is serious, so that the perovskite cannot completely cover the substrate, resulting in a large leakage current, thus limiting the performance of the battery.

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