Solar cell emitting electrode corroding method
A technology for solar cells and emitters, applied in circuits, electrical components, climate sustainability, etc., can solve the problems of difficult control and repetition of corrosion, poor uniformity of sheet resistance, inconsistent emitter depth, etc., to improve wettability, easy Repeat, improve the effect of uniformity
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[0020] Example 1
[0021] Equipped with additive-free hydrofluoric acid and nitric acid etching solution, in which HF: HNO 3 : H 2 O (volume ratio of saturated solution) = 1:3:20; then configure the hydrofluoric acid and nitric acid etching solution with additives, in which HF:HNO 3 : H 2 O (volume ratio of saturated solution) = 1:3:20, the addition amount of sodium nitrite is 0.2mol / L, the addition amount of sodium sulfate is 0.1mol / L, the two mixed solutions are fully stirred and the temperature is stable At 20±2℃.
[0022] Take two single crystal silicon wafers with a size of 125×125mm. After cleaning, texturing, and diffusion, the square resistance is 30 ohms / square. One is etched in a mixed solution of hydrofluoric acid and nitric acid without additives for 120 seconds. After being etched in a mixed solution of hydrofluoric acid and nitric acid with additives for 120 seconds, the two silicon wafers were cleaned with a dilute alkali solution. After testing, the square resistanc...
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[0023] Example 2
[0024] Equipped with additive-free hydrofluoric acid and nitric acid etching solution, in which HF: HNO 3 : H 2 O (volume ratio of saturated solution) = 1:3:20; then configure the hydrofluoric acid and nitric acid etching solution with additives, in which HF:HNO 3 :H2O (saturated solution volume ratio) = 1:3:20, the addition amount of sodium nitrite is 0.2mol / L, the addition amount of sodium sulfate is 0.1mol / L, the two mixed solutions are fully stirred and the temperature is stable At 20±2℃.
[0025] Take two single-crystal silicon wafers with a size of 125×125mm. After cleaning and texturing, the square resistance after diffusion is 30 ohms / square. Both wafers are screen-printed with an etching mask on the emitter and dried. One piece was etched in the mixed solution of hydrofluoric acid and nitric acid without additives for 150 seconds, and the other piece was etched in the mixed solution of hydrofluoric acid and nitric acid with additives for 150 seconds. The...
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