Film solar battery based on crystalline silicon and manufacturing method thereof

Abstract

The invention relates to a film solar battery based on crystalline silicon and a manufacturing method thereof. The film solar battery based on the crystalline silicon comprises a baseplate, a first I-type semiconductor layer, a P-type semiconductor layer, a first electrode, a second I-type semiconductor layer, an N-type semiconductor layer and a second electrode, wherein the first I-type semiconductor layer, the P-type semiconductor layer and the first electrode are successively arranged on one side of the baseplate; the second I-type semiconductor layer, the N-type semiconductor layer and the second electrode are successively arranged on the other side of the baseplate; the P-type semiconductor layer comprises multiple P-type semiconductor sublayers with different doped ion concentrations, and the P-type semiconductor sublayers are successively arranged in a stacking manner according to the doped ion concentrations; the doped ion concentration of the P-type semiconductor sublayer positioned on the surface of the first I-type semiconductor layer is minimal; the N-type semiconductor layer comprises multiple N type semiconductor sublayers with different doped ion concentrations, and the N-type semiconductor sublayers are successively arranged in a stacking manner according to the doped ion concentrations; and the doped ion concentration of the N-type semiconductor sublayer positioned on the surface of the second I-type semiconductor layer is minimal. According to the invention, the photoelectric conversion efficiency of the film solar battery can be improved.

Description

technical field [0001] The invention relates to the technical field of thin-film solar cells, in particular to a thin-film solar cell based on crystalline silicon and a manufacturing method thereof. Background technique [0002] Thin-film solar cells are solar cells formed by depositing very thin (several micrometers to tens of micrometers) photoelectric materials on substrates such as glass, metal or plastic. Thin-film solar cells have a series of advantages such as power generation under weak light conditions, low energy consumption in the production process, and can greatly reduce raw material and manufacturing costs. They have become a research hotspot in recent years, and their market development potential is huge. [0003] Basic thin film solar cell structure, including single P-N junction, P-I-N / N-I-P and multi-junction. A typical single-junction P-N structure includes a P-type doped layer and an N-type doped layer. Single-junction P-N junction solar cells have two ...

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Problems solved by technology

[0006] But there is following defect in above-mentioned technology: when the doping concentration of the phosphorus ion in the phosphorus-doped layer 3 or the boron ion in the boron-doped layer 5 is higher, then the phosphorus-doped layer 3 or the boron-doped layer 5 will pollute the monocrystalline silicon substrate 4, thereby reducing the photoelectric conversion efficiency of the thin-film solar cell; when the doping concentration of the phosphorus ion in the phosphorus-doped layer 3 or the boron ion in the boron-doped layer 5 is low, the bandgap width of the thin-film solar cell will be reduced, thereby It will also reduce the photoelectric conversion efficiency of thin-film solar cells

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