Development of aluminum paste with/without boron content for crystalline silicon solar cells


Uzum A. , Ashikaga T., Noguchi T., Kanda H., Fukui H., Harada T., ...Daha Fazla

MATERIALS RESEARCH EXPRESS, cilt.7, 2020 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 7 Konu: 3
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1088/2053-1591/ab77ee
  • Dergi Adı: MATERIALS RESEARCH EXPRESS

Özet

Improvement of aluminum alloyed p + back surface fields (p + BSF) which is an essential requirement for achieving high efficiency silicon solar cells has been an important task. One of the ways to have better quality BSFs can be to introduce screen printable aluminum pastes with boron content. Two type of pastes were developed in this work and recipes were provided in detail: screen-printable aluminum paste without boron content (B-free-Al-paste), screen-printable aluminum paste with boron content (Al-B-paste). The ingredients of the pastes were optimized and basically evaluated in terms of alloying and impurity characteristics by measurement of sheet resistances, carrier lifetimes and SIMS analysis. Carrier lifetimes of the wafers processed by Al-B-paste maintained at around 300 mu s relatively higher than the wafers processed by B-free-Al-paste. P-type silicon solar cells were fabricated using developed pastes and were compared with those of the cells fabricated by commercial aluminum pastes. Best efficiency of 17.8% was achieved with totally vacuum-less cell production process and Suns-Voc analysis were also carried out for fabricated solar cells.