Preparation of organic-inorganic composite solar cell based on perovskite-nano germanium particles

Abstract

The invention discloses a preparation method of an organic-inorganic composite solar cell based on perovskite-nano germanium particles. The method includes preparing a titanium dioxide electron transfer layer on conducting glass; preparing germanium nano-particles through PECVD; adopting a nano germanium particle-ammonium methyl iodide-lead chloride-dimethyl formamide mixed precursor solution; adopting an ultrasonic spray method to prepare a perovskite-nano germanium particle composite active layer on the electron transfer layer; depositing a P type organic conducting layer on the perovskite-nano germanium particle composite active layer; and depositing a metal electrode layer on the P type organic conducting layer. Nano germanium particles embedded in a perovskite lattice network can expand the long wave response range of a perovskite solar battery, and nano germanium particles passivated by the perovskite network can provide a parallel transmission channel for transport of carriers; and the ultrasonic spray method can improve the utilization rate of raw materials, improve large-area uniformity, and the requirements of industrial production are met.

Description

technical field [0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a method for preparing a perovskite solar cell. Background technique [0002] Looking back on the development of solar cells, perovskite solar cells have gone from an initial efficiency of 3.8% to an efficiency of more than 20% in just a few years. Titanium battery research has become a research hotspot in the field of photovoltaics. [0003] At present, the efficiency of photovoltaic devices based on the perovskite active layer has been maintained at about 20%. In order to further improve the efficiency of the device, many research groups have tried improvement methods such as ultraviolet ozone treatment and the introduction of a modification layer, but the effect is not very satisfactory. A very important reason is that the long-wavelength light absorption coefficient of perovskite solar cells is poor. For example, CH 3 NH 3 PB 3-x Cl x The absorption la...

AI Technical Summary

Problems solved by technology

[0003] At present, the efficiency of photovoltaic devices based on the perovskite active layer has been maintained at about 20%. In order to further improve the efficiency of the device, many research groups have tried improvement methods such as ultraviolet ozone treatment and the introduction of a modification layer, but the effect is not very satisfactory. One of the main reasons is that the long-wavelength light absorption coefficient of perovskite solar cells is poor.

For example, CH 3 NH 3 PB 3-x Cl x The absorption layer material, with a band gap of 1.5eV, cannot effectively absorb and utilize long-wavelength sunlight with a wavelength greater than 825nm, making it difficult to greatly increase the short-circuit current density; Spin coating, dip coating and other methods are used, but these methods are not well adapted to the production requirements of large-scale industrialization.

For the spin coating method, first of all, the large-area uniformity of film formation cannot be guaranteed, and another unavoidable problem is the waste of raw materials. Experiments have shown that the loss of the reaction precursor solution can be as high as 90% during the high-speed spinning process.

For the dip coating method, its obvious defect is that when the substrate is pulled up from the precursor solution, the thickness of the film will be uneven due to factors such as gravity.

Images