Thin-film solar cell and method for preparing same

Abstract

The invention provides a thin-film solar cell. Electrode grooves are formed in a low-resistance window layer, and collection electrodes are deposited in the electrode grooves respectively. On the premise that the thickness of a buffer layer and the thickness of a high-resistance window layer are large enough so that the density of a film layer of the thin-film solar cell can be ensured, the photon-generated carrier recombination probability of an interface can be effectively lowered. Due to the fact that the collection electrodes are arranged in the electrode grooves respectively, the thickness of the portions, in the perpendicular direction of the contacting areas of the collection electrodes and the electrode grooves, of the high-resistance window layer can be reduced, the internal resistance of the solar cell can be effectively reduced, the output power of the solar cell can be improved, meanwhile, the contact area between the collection electrodes and a transparent window layer composed of the high-resistance window layer and the low-resistance window layer is increased, the collection rate of the collection electrodes for photon-generated carriers is improved, and the output power of the thin-film solar cell is further improved. In addition, a method for preparing the thin-film solar cell is simple in process and allows large-scale industrial production to be easily achieved.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a thin-film solar cell with grooves in a transparent conductive window layer and a preparation method thereof. Background technique [0002] Solar cells, also known as "solar chips" or "photovoltaic cells", are photoelectric semiconductor sheets that use sunlight to generate electricity directly. When sunlight is incident, the sunlight shines on the p-n junction of the semiconductor sheet to form new hole-electron pairs. Under the action of the p-n junction electric field, the photo-generated holes flow to the p-region, and the photo-generated electrons flow to the n-region, and the external circuit is connected. After that, a current is formed; in physics, it is called photovoltaic (English full name is Photovoltaic, abbreviated as PV), referred to as photovoltaic. [0003] In the context of the shortage of raw materials for crystalline silicon solar cells and the rapid rise in price...

AI Technical Summary

Problems solved by technology

[0006] For this reason, in the existing thin-film solar cell structure to be solved by the present invention, the problem that the lower interfacial photogenerated carrier recombination probability and the smaller solar cell internal resistance cannot be compatible, provides a kind of interfacial photogenerated carrier recombination probability Thin-film solar cell with low battery internal resistance and preparation method thereof

Images