In recent years, PERC solar cells have been the dominant industrial cells compared with Al-BSF solar cells. Fill factor (FF) is a vital indication of the performance of solar cells. In this paper, a comparative study on the temperature coefficients of FF for PERC solar cells and Al-BSF solar cells are investigated under non-standard test conditions. It is found that the absolute value of the temperature coefficient of FF for PERC solar cell is always lower than that for Al-BSF solar cell under non-standard conditions, which agrees with the calculated result. The obtained results are beneficial to understand the performance of solar cell under non-standard conditions.
