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Wet process metal ion detection method for solar cell

A technology of solar cells and metal ions, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observation of the influence of chemical indicators, which can solve problems such as inability to detect, and achieve reliability and eliminate inaccuracies Effect

Inactive Publication Date: 2012-06-20
XINYU GIGA SOLAR NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the potassium thiocyanate method cannot be used to detect Fe 2+ , with certain limitations

Method used

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  • Wet process metal ion detection method for solar cell
  • Wet process metal ion detection method for solar cell
  • Wet process metal ion detection method for solar cell

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Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1: as figure 1 , 2 Shown; Based on the basic physical and chemical properties of the chemical reagent used in the present invention above, design the principle block diagram of the present invention as figure 1 shown.

[0052] The oxidation of the liquid to be tested is mainly achieved by adding highly oxidizing H to the liquid to be tested. 2 o 2 , to oxidize the low-valence metal ions that may exist in the test solution to the highest valence state without affecting the acidity and alkalinity, such as Fe 2+ Oxidized to Fe 3+ , thereby excluding the possible presence of Fe 2+ The impact on the test results (because KSCN has no obvious phenomenon when it encounters ferrous ions, it immediately turns red when it encounters ferrous ions, and can only detect Fe 3+ ions, Fe cannot be detected 2+ ), while not affecting the final determination of whether the liquid to be tested contains metal ions.

[0053] Acid-base titration mainly uses the KOH titration ...

Embodiment 2

[0071] Alternatives to the present invention:

[0072] 1. Alkaline titration: Titrate the solution to be tested to neutral.

[0073] 2. Potassium ferricyanate detection: detection of Fe with potassium ferricyanate 2+ .

[0074] 3. Potassium thiocyanate detection: detection of Fe with potassium thiocyanate 3+ .

[0075] Along the train of thought of the present invention, other people can carry out metal ion (Fe 2+ , Fe 3+ ) detection. That is: first, through alkaline titration, the acidity and alkalinity of the solution to be tested is controlled at neutral, eliminating the inaccurate test results caused by acidic conditions and the possible hazards of ferricyanic acid and thiocyanic acid; Potassium is used to detect Fe2+, and observe whether a ferrous ferricyanide precipitate (Tengshi blue) with a characteristic blue color is formed

[0076] 3Fe 2+ +[Fe(CN)6] 3- =Fe 3 [Fe(CN) 6 ] 2 ↓

[0077] Finally, carry out the detection of Fe3+ with potassium thiocyanate, ob...

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Abstract

The invention discloses a wet process metal ion detection method for solar cell. The method comprises oxidation of to-be-detected solution; acid-base titration; preliminary judgment of metal ions; and KSCN metal ion detection, so as to eliminate the influence of a strong acid environment on the detection result while the oxidation of to-be-detected solution ensures that low-valence metal ions can be detected out by the KSCN reagent after oxidation of the low-valence metal ions to guarantee accuracy of the detection result. The invention integrates advantages and disadvantages of a potassium thiocyanide metal ion detection method, adopts two pretreatment steps of to-be-detected solution oxidation and acid-base titration to eliminate inaccuracy of detection result caused by acid environment and low-valence metal ions, guarantees reliability of the test result, makes full use of sensitivity of KSCN in metal ion detection under conventional conditions, and carries out metal ion detection in a wet process of solar cell production by preparing KSCN solution.

Description

technical field [0001] The invention relates to a method for detecting metal ions in a wet process for solar cells, and belongs to the technical field of solar cell production. Background technique [0002] During the process of solar cells, the pollution of metal ions will greatly affect the performance of solar cells, resulting in a decline in electrical performance. Metal ions can form recombination centers in silicon wafers, resulting in a reduction in the minority carrier lifetime, which in turn affects the electrical performance parameters of the finished battery such as open circuit voltage, short circuit current, and conversion efficiency. Therefore, it is very necessary and important to monitor metal ion pollution during the production process of solar cells. [0003] In the solar cell process, the monitoring of metal ions is mainly concentrated in the cleaning section before diffusion. If there is metal ion contamination at this time, the performance of the PN jun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/82
Inventor 孙良欣俞建田玉华胡盛华全成范圣凯
Owner XINYU GIGA SOLAR NEW ENERGY
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