Defect passivation on cast-mono crystalline screen-printed cells
Alison WENHAM , Lihui SONG , Malcolm ABBOTT , Iskra ZAFIROVSKA , Sisi WANG , Brett HALLAM , Catherine CHAN , Allen BARNETT , Stuart WENHAM
Front. Energy ›› 2017, Vol. 11 ›› Issue (1) : 60 -66.
Defect passivation on cast-mono crystalline screen-printed cells
Cast-mono crystalline silicon wafers contain crystallographic defects, which can severely impact the electrical performance of solar cells. This paper demonstrates that applying hydrogenation processes at moderate temperatures to finished screen print cells can passivate dislocation clusters within the cast-mono crystalline silicon wafers far better than the hydrogenation received during standard commercial firing conditions. Efficiency enhancements of up to 2% absolute are demonstrated on wafers with high dislocation densities. The impact of illumination to manipulate the charge state of hydrogen during annealing is investigated and found to not be significant on the wafers used in this study. This finding is contrary to a previous study on similar wafers that concluded increased H− or H0 from laser illumination was responsible for the further passivation of positively charged dangling bonds within the dislocation clusters.
silicon solar cell / dislocation / cast-mono / laser / hydrogen passivation
Higher Education Press and Springer-Verlag Berlin Heidelberg
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