Silicon-based double-junction solar cell with homojunction and heterojunction and preparation method thereof

Abstract

The invention relates to the field of new energy sources, in particular to a silicon-based solar cell and a preparation method thereof. A silicon-based double-junction solar cell with a homojunction and a heterojunction comprises a crystal silicon chip, a silicon-based semiconductor film, a transparent conducting film, a front side metal electrode and a back side metal electrode, wherein the crystal silicon chip is a monocrystalline silicon chip or a polycrystalline silicon chip; the homojunction is formed on the front side or the back side of the crystal silicon chip by a diffusion method and is a PN junction or a PP<->, PP<+>, NN<-> or NN<+> concentration junction; the front side of the crystal silicon chip is provided with the silicon-based semiconductor film; the silicon-based semiconductor film is an amorphous film or a nano-film of silicon, silicon / germanium or a silicon carbide material; and the heterojunction is formed between the silicon-based semiconductor film and the surface of the crystal silicon chip with the homojunction. High conversion efficiency and high cost performance of the solar cell are realized, and the consistence and stability of photoelectric performance of the cell are improved.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a silicon-based solar cell and a preparation method thereof. Background technique [0002] With the development of the global economy, the consumption of energy has increased dramatically. At present, the vast majority of energy sources are fossil fuels. Not only are resources dwindling, but also a large amount of carbon dioxide and other gases are emitted, making environmental problems increasingly serious. Therefore, domestic and foreign countries pay more and more attention to the development and utilization of renewable energy, especially photovoltaic power generation. In the past ten years, the global solar photovoltaic industry has maintained rapid growth, and has gradually become one of the most important industries driving global economic development after the microelectronics industry. [0003] The core of solar photovoltaic power generation is solar cells. Currently, more t...

AI Technical Summary

Problems solved by technology

The main problem is that the photoelectric efficiency is only slightly higher than that of ordinary diffused crystalline silicon solar cells, and in order to make the photoelectric performance consistent, the process parameter control requirements are relatively high, especially the thickness of the amorphous silicon layer must be strictly controlled, otherwise it may still cause cell efficiency. attenuation

[0008] In addition, there are some battery structures that can achieve greater than 20% efficiency, such as the buried groove solar cell (BCSC) developed by the University of New South Wales in Australia, the emitter passivation and the backside local diffusion solar cell (PERL), and the interdigitated solar cell. Back-contact electrode solar cells (IBC), etc., but these cells have complex structures and processes, and the manufacturing cost is too high compared with conventional cells

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