Preparation method of electrode grid lines, and photovoltaic (pv) cell

A preparation method of electrode grid lines, comprising the following steps:

• S1:
• providing a polymer layer as a transfer substrate;
• S2:
• applying conductive paste onto a formed side of the polymer layer to at least completely fill a trench in the formed side, and removing excess conductive paste from a surface of the polymer layer, ensuring that a surface of the trench and a surface of the conductive paste are coplanar;
• S3:
• providing a base material, aligning and bonding the formed side of the polymer layer applied with the conductive paste to the base material, and transferring the conductive paste onto the base material through a transfer method with a preset process parameter, wherein the process parameter for transferring comprises a pressure of 1-20 MPa, a temperature of 80-180° C., and a duration of 0.5-10 min;
• S4:
• removing the polymer layer to retain the conductive paste on the base material;
• and
• S5:
• sintering the conductive paste onto the base material, and forming electrode grid lines with a preset aspect ratio.