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Conductive slurry used for solar cell and method of preparing the same

A solar cell and conductive paste technology, applied in the field of solar cells, can solve the problems of low metal film warpage, large square resistance, and unsatisfactory photoelectric conversion efficiency

Active Publication Date: 2014-01-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problems that the square resistance of the solar cell sheet is still relatively large and the photoelectric conversion efficiency is not ideal when the existing conductive paste is applied to the solar cell, the present invention provides a method capable of preparing a low square resistance, high filling factor, and high photoelectric conversion efficiency. Higher conductive paste for solar cells and its preparation method. At the same time, the metal film prepared by the conductive paste has low warpage and can pass the water boiling test. The metal film layer is smooth and dense, has strong adhesion to silicon wafers, and has a good appearance

Method used

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  • Conductive slurry used for solar cell and method of preparing the same
  • Conductive slurry used for solar cell and method of preparing the same

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preparation example Construction

[0020] At the same time, the present invention provides a method for preparing the above-mentioned conductive paste for solar cells. The steps include: dispersing at least two kinds of inorganic glass powder and conductive metal powder in an organic carrier, and grinding to obtain the conductive paste. The method is simple and easy to implement.

[0021] Dispersed in the organic vehicle using various dispersion methods known to those skilled in the art, the conductive metal powder and various glass powders can be added to the organic vehicle for mixing, or all or part of them can be mixed and added to the organic vehicle for mixing. It can be added at one time or in batches. The present invention is not limited. The method of adding and mixing method is not limited in the present invention. When the conductive metal powder is spherical aluminum powder with various particle sizes, it can be specifically Mix the selected glass powders and spherical aluminum powders of various par...

Embodiment 1

[0026] This embodiment is used to prepare aluminum back field conductive paste.

[0027] (1) Preparation of inorganic glass powder

[0028] Take 49wt% Bi 2 o 3 , 25wt% B 2 o 3 , 16wt% SiO 2 , 4wt% Sb 2 o 3 , 2.0wt% BaO, 2.0wt% MgO, 1.0wt% CaO, 1.0wt% Al 2 o 3 , use a V-type mixer to mix evenly, put it into a porcelain crucible, put it into a silicon carbide rod furnace, preheat it to 550°C, keep it warm for 0.5h, then raise it to 1250°C, melt it for 1.0h, and filter it with water to obtain glass Put the beads into the ball milling tank, control the mass ratio, zirconia balls: glass beads: deionized water = 4:1:0.5, tank speed 100 / min, wet ball milling for 7 hours, filter, dry, then dry mill for 2.5 hours, dry When grinding, the mass ratio of zirconia balls to glass beads is 1:2 to obtain inorganic glass powder A11.

[0029] Using a BT-2003 laser particle size distribution analyzer (produced by Liaoning Dandong Baite Company, the same below), using water as the disper...

Embodiment 2

[0037] Aluminum back field conductive paste S2 was prepared by the same method as in Example 1, except that the mass ratio of inorganic glass powder A11 to inorganic glass powder A12 was 1:0.5 to obtain mixed glass powder A2, which was prepared by mixing glass powder A2 Aluminum back field conductive paste S2 was obtained.

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Abstract

The invention provides conductive slurry used for solar cells and a method of preparing the same. The conductive slurry comprises metal powder, an inorganic binder and an organic carrier. The inorganic binder contains at least two kinds of inorganic glass powder. The prepared aluminium back surface field conductive slurry is silk-screened on a silicon chip to obtain a metal film layer that is smooth and compact, has a nice appearance, is free of bubbles and metal particles, and is high in cell filling factor and high in photoelectric conversion efficiency. Meanwhile, the metal film layer is tightly adhered to the silicon chip, the warping degree of cells is low, and cells can stand a water boiling test.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a conductive paste for solar cells and a preparation method thereof. Background technique [0002] With the depletion of traditional energy sources and the aggravation of environmental pollution, the development and application of new energy sources has become a hot spot in human research. Inexhaustible, green and pollution-free solar energy is one of the key points in the development and utilization of new energy. [0003] Conductive paste is an important material for making silicon-based solar cells. Silicon-based solar cells are generally prepared by printing a conductive paste on a silicon substrate, followed by drying and sintering to prepare the back field and electrodes. The existing conductive paste is mainly made by mixing and rolling functional powder (metal powder), inorganic glass powder and organic carrier. Among them, metal powder is generally used as a condu...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00C03C12/00H01L31/0224
Inventor 谭伟华廖辉管玉龙符燕青
Owner BYD CO LTD
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