Solar cell and photovoltaic module

Abstract

The invention provides a solar cell and a photovoltaic module, and relates to the field of solar cells. The solar cell comprises: a semiconductor substrate, wherein the semiconductor substrate comprises a first surface and a second surface which are oppositely arranged; a first dielectric layer located on the first surface; a first N+ doped layer positioned on the surface of the first dielectric layer; a first passivation layer and / or a first anti-reflection layer located on the surface of the first N+ doped layer; a first electrode positioned on the surface of the first passivation layer and / or the first anti-reflection layer; a second dielectric layer located on the second surface; a first P+ doped layer positioned on the surface of the second dielectric layer; a second passivation layerand / or a second anti-reflection layer located on the surface of the first P+ doped layer; and a second electrode positioned on the surface of the second passivation layer and / or the second anti-reflection layer. According to the invention, the limitation that the passivation contact structure needs to be mutually balanced between transverse transmission and polycrystalline silicon film light absorption when applied to the front surface of the battery can be relieved, and the short-circuit current of the battery is improved while high open-circuit voltage is achieved.

Description

technical field [0001] The present application relates to the technical field of solar cells, in particular to a solar cell and a photovoltaic module. Background technique [0002] In recent years, with the development of science and technology, solar cells have gradually changed from the theoretically cleanest inexhaustible energy source to the energy source that can stably produce and supply energy on a large scale. Production is also rising every year. And with the development of the photovoltaic industry, improving the conversion efficiency of solar cells has become the goal pursued by photovoltaic enterprises. In order to achieve high efficiency of solar cells, people design a variety of cell structures, among which, the passivation contact technology (TunnelOxide Passivated Contact, TOPCon) is to prepare a layer of ultra-thin tunnel oxide layer and a layer of highly doped contact on the back of the cell. A thin layer of polysilicon to form a passivation contact struc...

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Problems solved by technology

However, on the one hand, although ITO is a transparent conductive oxide, it will also cause a certain amount of light absorption loss and affect the conversion efficiency of the battery; on the other hand, after ITO is used, it cannot be compatible with the existing high-temperature production line and high-temperature metallization process. High cost requirements for upgrading existing battery production lines

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