A method for controlling corrosion grooves used for making texturing of solar cells

A technology of solar cells and control methods, which is applied in the manufacture of circuits, electrical components, semiconductors/solid-state devices, etc., can solve problems such as high manufacturing costs, high maintenance costs, and difficult maintenance, and achieves reduced purchase costs, simple maintenance, and improved technology. stable effect

Active Publication Date: 2015-12-02
YINGLI ENERGY CHINA
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Problems solved by technology

At present, the equipment provided by equipment suppliers, the refrigerator for controlling the temperature of the corrosion tank, mainly uses complex control circuits to control the temperature fluctuation range within ±0.5°C. This type of refrigerator is expensive to manufacture and requires frequent manual fine-tuning of the temperature setting value or Deviation value, high maintenance cost, difficult maintenance, and the process still has small fluctuations

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  • A method for controlling corrosion grooves used for making texturing of solar cells

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Embodiment 2

[0030] Example 2, (2) Set the temperature of the corrosion tank to X=11.5 degrees Celsius; (2) Collect the actual temperature of the current corrosion tank as Y=11.9 degrees Celsius; (3) The coefficient α in this corrosion solution is 0.125; ( 4) Set the initial speed of the corrosion tank roller movement as V 1 =2 m / min; (5) According to the formula V 2 =V 1 +α(Y-X) to obtain the actual speed V that controls the movement of the corrosion tank roller 2 =2+0.125 (11.9-11.5)=2.05 m / min.

[0031]By using the method, the control system has lower requirements on the temperature control accuracy of the refrigerator, and a simple domestic refrigerator can also meet the process requirements, because the control circuit is simple, the purchase cost can be significantly reduced, and the selection range of the refrigerator is wider. It is easier and more convenient to maintain and repair during use. The present invention uses the actual temperature detected by the sensor and the spee...

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Abstract

The invention discloses a control method of a corrosion tank used for solar cell piece texturing, relating to the technical field of methods for changing surface physic characteristics or shapes of a semiconductor material. The control method comprises the following steps of: (1) setting the temperature of the corrosion tank as X DEG C; (2) acquiring the practical temperature of the current corrosion groove as Y DEG C; (3) setting a coefficient alpha based on different corrosive liquids; (4) setting an initial speed of a running rolling wheel of the corrosion tank as V1 m / min; (5) controlling the practical speed of the running rolling wheel of the corrosion tank as V2 m / min, V2=V1+alpha(Y-X). As the speed of the corrosion tank is controlled, and the running speed of the rolling wheel of the corrosion tank is controlled by the practical temperature of the corrosion tank in real time, the control method of the corrosion tank used for the solar cell piece texturing realizes the purpose of steady technology and improves quality as well as photoelectric conversion efficiency of solar cell pieces.

Description

technical field [0001] The present invention relates to the technical field of methods for modifying the physical properties or shape of a surface of a semiconductor material. Background technique [0002] The stability of the texturing process has a great influence on the efficiency and quality of the cell. When the process coefficients such as equipment exhaust, chemical liquid ratio, and liquid replenishment volume are set reasonably, the temperature fluctuation of the corrosion tank will have a great impact on the corrosion amount and the effect of the texturing surface. The impact is great, resulting in fluctuations in cell efficiency and quality. The texturing process is to use the damaged layer of the silicon wafer to texture the surface of the silicon wafer through a mixed solution of nitric acid (HNO3) and hydrofluoric acid (HF). Form uneven surfaces and a large number of holes on the surface of the silicon wafer to increase the light-receiving area on the surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/67H01L21/306
Inventor 孙双庆康建宁魏双双马宏力
Owner YINGLI ENERGY CHINA
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