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Composition for preparing back conductor of photovoltaic cell, aluminum paste and photovoltaic cell

A photovoltaic cell and composition technology, applied in the field of solar cell materials, can solve problems such as unfavorable cell efficiency, and achieve the effects of improving photoelectric conversion efficiency, short-circuit current, and cell efficiency.

Inactive Publication Date: 2019-07-16
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is detrimental to the improvement of battery efficiency

Method used

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  • Composition for preparing back conductor of photovoltaic cell, aluminum paste and photovoltaic cell
  • Composition for preparing back conductor of photovoltaic cell, aluminum paste and photovoltaic cell
  • Composition for preparing back conductor of photovoltaic cell, aluminum paste and photovoltaic cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, different electron blocking materials and glass frits were used to prepare oxide compositions, which were used to prepare aluminum paste, and then sintered to form different BSF layers. The purity of the raw materials used in this example is all higher than 99.9%. The formula of the oxide composition of this example is shown in Table 1.

[0041] Table 1 oxide composition formula (weight percent %)

[0042] Trial ID# glass frit electron blocking material Comparative test 1 5% SiO 2 , 37%B 2 o 3 , 16% Bi 2 o 3 , 16% ZnO, 26% Sb 2 o 3

test 1 4% SiO 2 , 26%B 2 o 3 , 11% Bi 2 o 3 , 11% ZnO, 19% Sb 2 o 3

29%MoO 3

test 2 4% SiO 2 , 26%B 2 o 3 , 11% Bi 2 o 3 , 11% ZnO, 19% Sb 2 o 3

29%Fe 2 o 3

Test 3 4% SiO 2 , 26%B 2 o 3 , 11% Bi 2 o 3 , 11% ZnO, 19% Sb 2 o 3

29%Al 2 o 3

Test 4 4% SiO 2 , 26%B 2 o 3 , 11% Bi 2 o 3 , ...

Embodiment 2

[0056] In this example, the oxide composition of Test 7 in Table 1 was used to prepare aluminum pastes with different proportions. The specific formula of the aluminum paste is shown in Table 3.

[0057] Component and consumption (weight percent %) of solar cell silver paste of table 3

[0058] test Aluminum powder organic medium oxide composition 1 50％ 40％ 10％ 2 80％ 15％ 5％ 3 80％ 17％ 3％ 4 80％ 18％ 2％ 5 80％ 19％ 1％ 6 85％ 10％ 5％ 7 85％ 14％ 1％ 8 90％ 9％ 1％

[0059] Weigh each component according to the weight ratio in Table 3, and mix to make the aluminum paste of this example. Wherein, the components of the organic medium and the distribution ratio of each component are the same as those in Example 1.

[0060] Similarly, according to the same method as in Example 1, the aluminum paste of this example is printed on the semi-finished monocrystalline silicon cell sheet containing the silicon nitride anti-refle...

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Abstract

The invention discloses a composition for preparing a back conductor of a photovoltaic cell, aluminum paste and the photovoltaic cell. The composition comprises an electron blocking material and a glass material, wherein the electron blocking material comprises at least one of Fe2O3, Al2O3 and MoO3, or also comprises at least one of Cr2O3, NiO, V2O5, WO3 and MoS2; and the glass material comprisesSiO2, B2O3 and Bi2O3, or further comprises at least one of ZnO, Li2O, Na2O, MgO, CaO, Hf2O, CuO, TiO2, Sb2O3 and Cr2O3. The composition disclosed by the invention is added into the aluminum paste, sothat a thicker BSF layer can be formed after sintering, the compounding of current carriers can be reduced, the short-circuit current of a solar cell is increased, the photoelectric conversion efficiency is improved, and the mechanical and chemical properties of an aluminum back surface field are improved.

Description

technical field [0001] The present application relates to the field of solar cell materials, in particular to a composition for preparing back conductors of photovoltaic cells, aluminum paste and photovoltaic cells. Background technique [0002] Solar photovoltaic cells are referred to as photovoltaic cells, or solar cells; at present, silicon solar cells based on silicon are widely used in ground photovoltaic systems. The structure of a silicon solar cell generally includes a front conductive material, an anti-reflection layer, a silicon substrate, and a back conductive material. On the silicon material substrate, due to the different doping concentration, after the incident light of suitable wavelength is irradiated, the electron-hole pairs that can be separated can be generated, and the electric energy can be transported out through the front conductive material and the back conductive material. During the transport process, the electron-hole pairs are easy to recombine,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/04H01B1/16H01B1/22
CPCH01B1/16H01B1/22H01L31/022425H01L31/04Y02E10/50
Inventor 潘锋姜行高舟王星博刘建陈勇吉林原林海
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL