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Conductive paste for solar cell electrode

A solar cell and conductive adhesive technology, which is applied in the field of solar cells, can solve the problems of large FF changes and unavailability, and achieve the effect of improving performance

Active Publication Date: 2010-11-17
SHARP KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in any conductive paste, there is a problem that in a solar cell having an electrode formed using the conductive paste, a sufficiently high FF (Fill Factor) cannot be obtained, and due to variations in the firing temperature for forming the electrode, The resulting large change in FF

Method used

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  • Conductive paste for solar cell electrode
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  • Conductive paste for solar cell electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The present embodiment is an example of using an organometallic compound, ie, an indium acetylacetonate compound, as (A) a substance that turns into a gas in a temperature range of 150 to 800°C. When compared with the case of no addition, it is possible to maintain a high FF over a wide temperature range and obtain an FF with less unevenness by adding a vaporizable substance to the conductive adhesive.

[0097] The composition of the conductive adhesive (expressed in parts by weight) is shown in Table 1. The conductive adhesive was prepared by mixing the ingredients with a planetary mixer and a 3-roll mixer.

[0098] Table 1

[0099]

[0100] *In(C 5 h 7 o 2 ) 3 Indium acetylacetonate. It is amorphous and has an average particle size of 0.2 μm (the same applies to other examples).

[0101] The firing conditions are: the peak temperature is 705°C, 725°C or 745°C, and the firing time is 2 minutes.

[0102] The FF of the obtained solar cell is shown in image 3...

Embodiment 2

[0104] The present example is an example in which acetylacetonation of indium, which is an organometallic compound, is used as a substance that becomes a gas in a specific temperature range, and the amount of addition thereof is changed.

[0105] The composition of the conductive adhesive (expressed in parts by weight) is shown in Table 2. The conductive adhesive was prepared by mixing the ingredients with a planetary mixer and dispersing with a 3-roll mixer.

[0106] Table 2

[0107]

[0108] The firing conditions are: peak temperature 725°C, firing time 2 minutes.

[0109]Table 2 shows the FF of the obtained solar cell. In Examples 2-1 to 2-3 of the indium-added acetylacetonate compound, high FF was exhibited in any addition amount.

Embodiment 3

[0111] This example is an example in which an organometallic compound, ie, indium acetylacetonate, is used as a substance that becomes a gas in a specific temperature range, and the amount of ZnO as a metal oxide is changed.

[0112] The composition of the conductive adhesive (expressed in parts by weight) is shown in Table 3. The conductive adhesive was prepared by mixing the ingredients with a planetary mixer and dispersing with a 3-roll mixer.

[0113] table 3

[0114]

[0115] The firing conditions are: peak temperature 725°C, firing time 2 minutes.

[0116] Table 3 shows the FF of the obtained solar cell. Examples 3-1 to 3-6 to which ZnO was added showed higher FF than the comparative example to which ZnO was not added. In particular, a high FF is exhibited when ZnO is added in an amount of 0.5 to 15 parts by weight, especially 1 to 15 parts by weight.

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Abstract

A conductive paste for solar cell electrodes with which high FF value can be obtained stably, and a method for producing a solar cell using the same are provided. The conductive paste is a conductive paste for solar cell electrodes which includes an organic binder, a solvent, conductive particles, glass frits, and (A) a substance which changes into a gas at a temperature in the range of 150 to 800 DEG C, and a metal oxide, (B) an organometallic compound and a metal oxide, or (C) a compound containing Al, Ga, In or Tl.

Description

technical field [0001] The present invention relates to a conductive adhesive for solar cell electrodes, in particular to a conductive adhesive for crystalline silicon solar cell electrodes such as single crystal or polycrystalline silicon, an electrode of a solar cell formed by firing the conductive adhesive, and an electrode having the electrode. A solar cell and a method for manufacturing a solar cell using the conductive adhesive. Background technique [0002] In conventional solar cells using single-crystal or polycrystalline silicon as the main semiconductor substrate material, the electrons generated by light incident and absorbed into the semiconductor are separated by the electric field generated on the PN junction surface near the substrate surface. The hole pairs are separated, and then are drawn to the outside as a current through electrodes formed so as to form low contact resistance with the P-type semiconductor and the N-type semiconductor respectively. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/04H01L21/28H01L21/288H01L31/042
CPCY02E10/52H01B1/20H01L31/022425Y02E10/50
Inventor 町田智弘殿村嘉章宫泽彰大平圭祐饭田英世山崎敏荣
Owner SHARP KK
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