Photovoltaic cell and preparation method thereof, and photovoltaic module

Abstract

The embodiment of the present application relates to the field of solar energy, and provides a photovoltaic cell and its preparation method, and a photovoltaic module. The photovoltaic cell includes: a substrate; the emitter on one side of the substrate includes: at least two first doped regions spaced apart from each other; The second doped region is located between adjacent first doped regions, and there is a gap between the second doped region and two adjacent first doped regions; the transition region is located in the gap, and the first doped region, The transition region and the second doping region have the same doping element, and the concentration of the doping element in the first doping region is smaller than that in the second doping region; the transition region is in contact with the second doping region is the reference surface, the concentration of doping elements in the transition region increases with the decrease of the distance between the transition region and the reference surface, along the direction perpendicular to the reference surface, the width of the second doping region is the same as that of the transition region The ratio of width is 3:1~1:1. The embodiments of the present application are at least beneficial to improving the transport efficiency of carriers in the emitter.

Description

technical field [0001] The embodiments of the present application relate to the field of solar energy, and in particular to a photovoltaic cell, a preparation method thereof, and a photovoltaic module. Background technique [0002] A photovoltaic cell is a semiconductor device that converts solar energy into electricity. Due to the need to have a good ohmic contact between the electrode and the emitter, as well as to improve the spectral response in the short-wave band at the sunlight incident site, more and more manufacturers have begun to apply selective emitter photovoltaic cells. [0003] The main feature of selective emitter photovoltaic cells is high doping concentration in the electrode area and low doping concentration in the illuminated area. The purpose is to improve the passivation quality of the silicon wafer surface without reducing the contact quality between the electrode and the semiconductor material and reduce the The surface recombination and the recombin...

AI Technical Summary

Problems solved by technology

However, due to the influence of the doping process, there is a sudden change in the concentration of doping elements in the emitter, which makes the potential difference between the region with high concentration of doping elements and the region with low concentration of doping elements change suddenly, hindering the flow of carriers in the emitter. transmission

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