Solar battery sheet and assembly thereof

Abstract

The invention discloses a solar battery sheet and an assembly thereof, and relates to the technical field of a solar battery. The solar battery sheet comprises a front electrode, a back electrode and a substrate, and further comprises a conductive layer, an emitter electrode, tunneling layers and a backfield doping layer, wherein the upper surface and the lower surface of the substrate are each provided with a tunneling layer; the emitter electrode is disposed on the tunneling layer on the upper surface of the substrate, and the emitter electrode is provided with the conductive layer; the backfield doping layer is disposed below the tunneling layer at the lower surface of the substrate, and the conductive layer is arranged below the backfield doping layer; and the back electrode is arranged below the conductive layer below the backfield doping layer. According to the invention, the battery performance is improved, due to wide band gaps of the tunneling layers and the layer of the emitter electrode, the built-in electric field is enhanced, open-circuit voltages are improved accordingly, at the same time, the utilization rate of incident light is improved, and short-circuit currents are increased.

Description

technical field [0001] The invention relates to the technical field of solar cells. Background technique [0002] With the increasingly severe environmental problems highlighted, clean energy has become a hot topic in the development of the times. Solar power generation, clean and pollution-free, not only environmentally friendly, but also inexhaustible, has broad development prospects. With the rapid development of photovoltaic power generation technology, the cost of electricity per unit has been reduced to less than 1 yuan, which is gradually approaching the cost of traditional fossil energy power generation. The improvement of photoelectric conversion efficiency is the main symbol of technological development. Various new technologies emerge in an endless stream, such as Metal Wrap Through Hole Technology (MWT), Passivated Emitter Rear Contact (PERC), Interdigital Back Contact (IBC), etc. Among them, MWT technology can improve the efficiency of solar cells and simplif...

AI Technical Summary

Problems solved by technology

[0006] 1) The limited built-in electric field strength limits the increase of the open circuit voltage of the battery;

[0007] 2) The emitter has a small band gap (about 1.1eV), and it absorbs high-energy photons seriously;

[0008] 3) The battery preparation process needs to go through a high temperature process (usually above 800°C), which has an adverse effect on the life of the silicon chip with a small number of carriers. In addition, the energy consumption is also high

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