Method for metallizing front electrode of n-type solar cell

A method for metallizing a front electrode of an N-type solar cell, comprising the following steps:

• (1) preparing an N-type double-sided cell comprising an N-type crystalline silicon substrate before metallization, and forming a p+doped region and a front surface passivation anti-reflection coating on a front surface of the N-type crystalline silicon substrate in an inside-out sequence;
• and forming an n+doped region and a rear surface passivation coating on a rear surface of the N-type crystalline silicon substrate in an inside-out sequence;
• and
• (2) printing an aluminum paste on the front surface passivation anti-reflection coating to form first fingers, overprinting a silver paste on the first fingers to form second fingers, and printing a front silver paste on the first fingers to form busbars,
• wherein the first fingers have a width of 20-33 μm and a height of 10-20 μm, and a distance between two adjacent first fingers is 0.8-1.5 mm,
• wherein the second fingers have a width of 30-50 μm and a height of 5-10 μm, and a distance between two adjacent second fingers is 0.8-1.5 mm,
• wherein the width of the second fingers is greater than the width of the first fingers, and the height of the second fingers is smaller than the height of the first fingers.