阅读说明：本技术 用于硅异质结太阳能电池的制绒添加剂及其制绒方法 (Flocking additive and its etching method for silicon heterogenous solar battery ) 是由 张震华 于 2019-08-31 设计创作，主要内容包括：本发明提供了一种硅异质结太阳能电池的制绒添加剂及其制绒方法,制绒添加剂的原料各组分按质量百分比含量为：羟丙基甲基纤维素0.05％～2％,聚丙烯酸钠0.01％～10％,十二烷基苯磺酸钠0.01％～2％,余量为去离子水。在单晶硅片制绒液中添加本发明的添加剂,可以获得更加均匀且大小在3～8μm的金字塔,有利于提高硅异质结电池的开路电压和电流,从而提升电池效率。(The present invention provides the flocking additives and its etching method of a kind of silicon heterogenous solar battery, the feed components of flocking additive content by mass percentage are as follows: hydroxypropyl methyl cellulose 0.05%~2%, Sodium Polyacrylate 0.01%~10%, neopelex 0.01%~2%, surplus are deionized water.Additive of the invention is added in wool making solution for monocrystalline silicon pieces, can obtain pyramid of the more uniform and size at 3~8 μm, is conducive to the open-circuit voltage and electric current that improve silicon heterogenous battery, to promote battery efficiency.)

1. being used for the flocking additive of silicon heterogenous solar battery, which is characterized in that

Feed components content by mass percentage are as follows:

Hydroxypropyl methyl cellulose 0.05%~2%,

Sodium Polyacrylate 0.01%~10%,

Neopelex 0.01%~2%,

Surplus is deionized water.

2. a kind of etching method for silicon heterogenous solar battery, which is characterized in that the etching method includes the following steps:

One, flocking additive is prepared: the hydroxypropyl methyl cellulose for being 0.05%~2% by mass percent, 0.01%~ 10% Sodium Polyacrylate, 0.01%~2% neopelex, is added in the deionized water of surplus, and mixing is equal It is even to be made into flocking additive；

Two, prepare alkaline solution: flocking additive being poured into No.1 tempering tank, alkaline solution is poured into No. two tempering tanks Interior, the percent by volume of flocking additive and alkaline solution is 0.25~5:100；

Three, it prepares Woolen-making liquid: flocking additive being divided into 3~6 equal portions, a flocking additive is first poured into alkaline solution In, rock No. two tempering tanks to solution it is uniform after, then pour into second part, repetitive operation is matched until whole flocking additives are finished down It is set to Woolen-making liquid；

Four, making herbs into wool: monocrystalline silicon piece being immersed in Woolen-making liquid and carries out surface wool manufacturing, forms positive pyramid suede in monocrystalline silicon sheet surface Face.

3. a kind of etching method for silicon heterogenous solar battery according to claim 2, which is characterized in that described Alkaline solution be concentration 0.5%~10% sodium hydroxide or potassium hydroxide solution.

4. a kind of etching method for silicon heterogenous solar battery according to claim 2, which is characterized in that described Alkaline solution is the aqueous solution of inorganic base or organic base.

5. a kind of etching method for silicon heterogenous solar battery according to claim 2, which is characterized in that described Woolen-making liquid temperature be 70~85 DEG C.

6. a kind of etching method for silicon heterogenous solar battery according to claim 2, which is characterized in that reaction Time is 500s~1500s.

Technical field

The invention belongs to manufacture of solar cells technical fields, are related to a kind of making herbs into wool for silicon heterogenous solar battery Additive and its etching method.

Background technique

Silicon based hetero-junction solar battery is as emerging high performance solar batteries technology, with conventional solar cell phase Than there are many advantages such as high conversion efficiency, good temp characteristic, technological temperature be low, therefore silicon based hetero-junction solar battery has There is good development prospect.

The key technology core of heterojunction solar battery is the passivation of crystalline silicon substrate and amorphous silicon interface, high quality Passivation layer effectively can inhibit carrier in the compound of silicon face, while improve minority carrier life time, to improve photoelectric conversion efficiency.It passes The crystal silicon solar batteries of system have the silicon nitride passivation of 80 nano thickness, and silicon based hetero-junction solar battery is noncrystal Silicon passivation layer thickness only has 5~10 nanometers.Therefore, the uniform deposition of non-crystalline silicon thin-film is with regard to particularly significant.

The pyramidal uniformity of the making herbs into wool of surface of crystalline silicon and pyramidal size are deposited with significantly amorphous silicon membrane Influence, too small pyramid since its bottom curvature radius is smaller, amorphous silicon membrane be difficult to have here uniform deposition and by In the effect of stress, it is easy to produce micro-crack, passivation effect is caused to be deteriorated.Therefore, increasing pyramidal size can be effective Improve the open-circuit voltage of silicon heterogenous battery, and good pyramid uniformity, sunken photosensitiveness can be improved, promote silicon heterogenous electricity The electric current in pond, to improve the incident photon-to-electron conversion efficiency of silicon heterogenous solar battery.

The pyramid size of traditional silicon wafer flocking additive generally only has 1~3 μm, and pyramid is not uniform enough, reflectivity It is higher, it is not able to satisfy the demand of silicon heterogenous manufacture of solar cells and development.Therefore, a pyramid is bigger and more equal Even flocking additive is then particularly significant for the development of silicon heterogenous solar battery.

Summary of the invention

The purpose of the present invention is there is the above problem in view of the prior art, a kind of silicon heterogenous solar battery is provided Flocking additive and its etching method, additive of the invention is added in wool making solution for monocrystalline silicon pieces, can obtain more Pyramid of the even and size at 3~8 μm is conducive to the open-circuit voltage and electric current that improve silicon heterogenous battery, to promote battery Efficiency.

Object of the invention can be realized by the following technical scheme: the making herbs into wool for silicon heterogenous solar battery is added Agent, which is characterized in that

Feed components content by mass percentage are as follows:

Hydroxypropyl methyl cellulose 0.05%~2%,

Sodium Polyacrylate 0.01%~10%,

Neopelex 0.01%~2%,

Surplus is deionized water.

The present invention also provides a kind of etching methods for silicon heterogenous solar battery, which is characterized in that the making herbs into wool side Method includes the following steps:

One, flocking additive is prepared: the hydroxypropyl methyl cellulose for being 0.05%~2% by mass percent, 0.01% ~10% Sodium Polyacrylate, 0.01%~2% neopelex, is added in the deionized water of surplus, mixing Uniformly it is made into flocking additive；

Two, prepare alkaline solution: flocking additive is poured into No.1 tempering tank, alkaline solution is poured into No. two and is mixed It closes in bucket, the percent by volume of flocking additive and alkaline solution is 0.25~5:100；

Three, it prepares Woolen-making liquid: flocking additive is divided into 3~6 equal portions, it is molten that a flocking additive is first poured into alkalinity In liquid, rock No. two tempering tanks to solution it is uniform after, then pour into second part, repetitive operation until whole flocking additives are finished down, It is configured to Woolen-making liquid；

Four, making herbs into wool: monocrystalline silicon piece being immersed in Woolen-making liquid and carries out surface wool manufacturing, forms positive golden word in monocrystalline silicon sheet surface Tower flannelette.

Further, the alkaline solution is the sodium hydroxide or potassium hydroxide solution of concentration 0.5%~10%.

Further, the alkaline solution is the aqueous solution of inorganic base or organic base.

Further, the temperature of the Woolen-making liquid is 70~85 DEG C.

Further, the reaction time is 500s~1500s.

Compared with prior art, this for silicon heterogenous solar battery flocking additive and its etching method have with Lower advantage:

1. pyramid of the more uniform and size at 3~8 μm can be obtained, be conducive to the open circuit for improving silicon heterogenous battery Voltage and current, to promote battery efficiency.

2. the open-circuit voltage of silicon heterogenous battery can effectively be improved by increasing pyramidal size, and good pyramid Sunken photosensitiveness can be improved in uniformity.

Detailed description of the invention

Fig. 1 is the pyramidal SEM front view of silicon wafer obtained in embodiment 1.

Fig. 2 is the pyramidal SEM top view of silicon wafer obtained in embodiment 1.

Specific embodiment

Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described, However, the present invention is not limited to these examples.