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...

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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 gr

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