Bifacial solar cells with overlaid back grid surface

A method of fabricating a bifacial solar cell, the method comprising the steps of:

• diffusing phosphorous onto a front surface of a silicon substrate to form a front surface junction and onto a back surface of said silicon to form a back surface junction;
• removing a phosphor-silicate glass (PSG) formed during said phosphorous diffusing step;
• removing said back surface junction and isolating said front surface junction;
• depositing a front surface passivation and anti-reflection (AR) dielectric layer onto said front surface junction and a back surface passivation and AR dielectric layer onto said back surface of said silicon substrate;
• applying a back surface metal grid onto said back surface of said silicon substrate, wherein said back surface metal grid applying step is performed after said back surface junction removing step and before said back surface passivation and AR dielectric layer depositing step;
• applying a back surface contact grid, and aligning said back surface contact grid with said back surface metal grid;
• applying a front surface contact grid;
• firing said back surface contact grid;
• and
• firing said front surface contact grid.