KR920008295B1 - METHOD OF MANUFACTURING FOR SINTERING Cd1-xZnxS/CDTE SOLAR CELL - Google Patents

Abstract

This solar cell is manufactured by (1) mixing the mixture of CdS and ZnS powder with CdCl2. (2) coating the above on a glass substrate, (3) sintering the above, and (4) coating the mixture of CdTe and 3-7 wt.% CdCl2 on the obtained Cd1-xZnxS (0 < x < 0.1) thin film and then sintering it. CdTe is mixed with 4.5 wt.% CdCl2 powder to be charged inthe quartz bottle having small holes to evaporate CdCl2, so as tomake CdTe liquid phase sintered. Then it sintered at 625 deg.C, in nitrogen (N2) atmosphere for 1 hour.

Description

Sintered Cd1-XZnXS / CdTe Solar Cell Manufacturing Method

1 is a structure of a sintered compact Cd ₁ - _X Zn _X S / CdTe solar cell according to the present invention.

2 is a schematic view of the apparatus for producing a Cd ₁ - _X Zn _X S sintered film according to the present invention.

Figure 2a is a perspective view.

b is a sectional view.

3 is a curve showing the characteristic constant of the sintered compact Cd ₁ - _X Zn _X S / CdTe solar cell according to the present invention.

4 is a current-voltage characteristic curve of a sintered compact Cd _0.94 Zn _0.06 S / CdTe solar cell according to the present invention.

* Explanation of symbols for main parts of the drawings

1 quartz bottle 2 hole

4: Psalm

The present invention provides a Cd ₁ - _X Zn _X S / CdTe solar cell by applying and sintering the CdTe dough containing 3-7% by weight of CdCl ₂ on the Cd ₁ - _X Zn _X S sintered film used as the light transmitting layer of the solar cell prepared as in, Cd ₁ - is an object of the present invention to develop a Zn _{X X} S / CdTe solar cells - _{X X} S Zn bovine conjunctival adequacy of Zn composition by high efficiency sintered Cd _1.

In order to make a solar cell a power source on the ground, the solar cell itself must be manufactured inexpensively with a large area and have an efficiency of 10% or more. Substituting ZnS with a band gap of 3.68 eV for CdS (2.42 eV for band gap) increases the band gap of the light transmitting layer and increases the open voltage and short-circuit current than CdS / CdTe solar cells. It is well known that Cd ₁ - _X Zn _X S / CdTe solar cells are more efficient.

By the way, many studies have been conducted on sintered CdS / CdTe solar cells, and Japan's Matsushita Electric Co., Ltd. holds patent rights and manufactures and sells them, but reports on sintered Cd ₁ - _X Zn _X S / CdTe solar cells Is not yet.

The present invention relates to a method for manufacturing a highly efficient sintered compact Cd ₁ - _X Zn _X S / CdTe solar cell using a sintering method that can reduce the manufacturing cost by a simple manufacturing method will be described in detail below.

CdS powder, ZnS powder (determined according to the composition of the sintered film to be obtained), CdCl ₂ powder and organic binder are mixed well to make a dough, which is coated on a glass substrate, dried and sintered. On the prepared Cd ₁ - _X Zn _X S sintered film, a dough made by mixing CdTe powder, 3-7% by weight of CdCl ₂ powder and a binder was applied, dried and sintered, and then the electrode was attached and heat-treated at an appropriate temperature. Complete the ₁ - _X Zn _X S / CdTe solar cell (FIG. 1).

Hereinafter, the present invention will be described in more detail with reference to Examples.

EXAMPLE

10 mol% ZnS and weight percent CdCl ₂ sintering accelerator were added to the CdS powder, propylene glycol was used as an organic binder, kneaded, applied onto a silicon boride glass substrate, and dried at 120 ° C. for 3 hours. In order to allow the liquid phase sintering of the added CdCl ₂ - _X Zn _X S to be slowly evaporated during sintering, the dried specimen (4) is 1 × 5 × with four holes (2) with handles (3) as shown in FIG. Sintered in an 8cm quartz bottle (1) for 1 hour in a nitrogen atmosphere of 600 ℃ to prepare a sintered film Cd _0.94 Zn _0.06 S having a thickness of 15μm and a light transmittance of 76% under sunlight. After heat-treating the sintered film for 10 minutes in a nitrogen atmosphere at 600 ° C., a dough obtained by mixing CdTe powder, 4.5% by weight of CdCl ₂ powder, and an organic binder was mixed with a 150 mesh sieve and a thickness of about 30 μm and 3.5 ×. It applied so that it might become an area of 10 mm <2>. After drying the specimen 4 at 120 ° C. for 2 hours, CdCl ₂ was placed in a quartz bottle 1 having a suitable hole 2 (now 1 mm) so that CdTe could evaporate during sintering while performing liquid phase sintering. Sintering was carried out for 1 hour in a nitrogen atmosphere of 625 ℃ to prepare a sintered Cd _0.94 Zn _0.06 S / CdTe. Cd _0.94 Zn _0.06 S-sintered Cd _0.94 Zn _0.06 S bovine conjunctival above the indium-silver (In-Ag) electrodes, CdTe bovine conjunctival formed on the carbon electrode, thereon is attached to the electrode in a nitrogen atmosphere of 350 ℃ 10 bun dongan The heat treatment completed the Cd _0.94 Zn _0.06 S / CdTe solar cell.

3 shows the characteristic constants of Cd ₁ - _X Zn _X S / CdTe solar cells measured under an incandescent lamp of 50 mW / cm 2. As the Zn concentration, x, increased the open voltage and short-circuit current in CdS / CdTe solar cells at 0 <x <0.07, resulting in higher efficiency, and at x> 0.07, all characteristics were degraded.

In FIG. 4, the sintered compact Cd _0.94 Zn _0.06 S / CdTe solar cell was measured under sunlight of 76 mW / cm 2, and exhibited an efficiency of 12.5%. This Cd ₁ - _X Zn _X S bovine conjunctival of Zn composition is 0 <x <0.07 of Cd ₁ - _X Zn _X S by using the sintered film in the light transmitting layer with high efficiency CdS / CdTe solar cell sintered Cd ₁ - _X Zn It can be seen that _X S / CdTe solar cell development is possible.

Claims (2)

3-7% by weight of CdCl _{2 in} CdTe on Cd ₁ - _X Zn _X S (0 &lt; x &lt; 0.10) thin film obtained by applying a dough containing CdCl ₂ to CdS and adding CdCl ₂ onto a glass substrate and then sintering it. A method for producing a sintered compact Cd ₁ - _X Zn _X S / CdTe (0 &lt; The method of claim 1, wherein 4.5 wt% of CdCl ₂ powder is mixed with CdTe, and the mixture is placed in a quartz bottle provided with small pores so that CdCl ₂ , which forms liquid phase sintering of CdTe, can be evaporated during sintering. Sintering under an atmosphere for 1 hour.

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