Method for preparing alumina passivation film on surface of crystalline silicon solar energy battery
A technology for solar cells and passivation films, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of low aluminum oxide film deposition rate, complex equipment, high cost, etc., achieve excellent passivation effect, mild reaction conditions, and equipment low cost effect
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[0013] The specific embodiment of the present invention is as follows: an aluminum oxide passivation film is prepared on the surface of a crystalline silicon solar cell by a chemical solution deposition method. Specifically:
[0014] (1) Select the material for mixing the sol: for the purpose of saving costs, choose aluminum chloride and absolute ethanol as the material for the mixing solution. The principle of the reaction between the two is
[0015] AlCl 3 + 3 C 2 h 5 OH→Al(C 2 h 5 O) 3 + 3 HCl.
[0016] (2) Preparation of sol: In a well-ventilated air cylinder, dissolve the aluminum chloride material in a certain concentration of absolute ethanol, stir and oscillate fully with a stirring rod until the solution becomes clear, so that the sol can be uniform and transparent, and measure the sol pH value, and adjust the pH value of the sol between 1 and 2, the acid used to adjust the pH value is hydrochloric acid. Let the prepared sol stand for a period of time (about...
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