Preparation of perovskite-nano-germanium particles organic-inorganic hybrid solar cells

Abstract

The invention discloses a method for preparing an organic-inorganic composite solar cell based on perovskite-nano-germanium particles. The method comprises: preparing a titanium dioxide electron transport layer on conductive glass; preparing germanium nanoparticles by PECVD; using nano-germanium Particle-methylammonium iodide-lead chloride-dimethylformamide mixed precursor; the perovskite-nano-germanium particle composite active layer was prepared on the electron transport layer by ultrasonic spraying; the perovskite-nano-germanium particle A P-type organic conductive layer is deposited on the composite active layer; a metal electrode layer is deposited on the P-type organic conductive layer. The nano-germanium particles embedded in the perovskite lattice network can expand the long-wave response range of perovskite solar cells, and the nano-germanium particles passivated by the perovskite network can provide parallel transmission channels for carrier transport; ultrasonic The spraying method can improve the utilization rate of raw materials, improve the uniformity of a large area, and is suitable for the requirements of industrial production.

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...

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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.

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