Thermal Laser Separation of PERC and SHJ Solar Cells

Mitigating Cut Losses in Interdigitated Back Contact Solar Cells

“…During the I-V measurement, the series-resistance-free Suns-V oc curve was measured under a light intensity of 1000 W/m 2 . The pFF was extracted from the Suns-V oc curve [25] and was used to further analyze the edge recombination losses without the effect of series resistance [13]. pFF was tested at different stages, i.e., before laser scribing, after laser scribing without cleaving, and after cleaving.…”

“…2) Cutting of various cell structures was also extensively studied, including passivated emitter and rear contact (PERC) [10], n-type passivated emitter rear totally (n-PERT) diffused [11], and silicon heterojunction (SHJ) [12] solar cells. In particular, Baliozian et al [13] compared the cutting losses in SHJ and PERC cells. In contrast to PERC cells, high-efficiency solar cells, such as SHJ cells, which have a high V oc , result in higher losses.…”

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“…[44] As consequence, a not-appropriate cut may lead to lower efficiency and/or reliability issues. [45,46] Furthermore, the new surface created by the cut, suffers from a poor passivation [47] and may require changes in the other processes such as Al2O3 deposition or light soaking to improve efficiencies. [48] Another strategy, named shingling, consists in the cut of the cells in smaller parts and connecting these shingles employing Electrically Conductive Adhesive (ECA).…”

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“…This, however, leads to higher consumption of precious resources as silver (Ag) or copper and magnifies shadowing effects. Another way to reduce the cell interconnection losses is the reduction of string currents by interconnecting separated, that is, smaller, solar cells such as half cells [2][3][4][5][6][7][8][9][10] and shingle cells. 3,[11][12][13][14][15][16][17][18][19] Conventional shingling also increases the consumption of Ag 20 due to the necessity of Busbar and Ag containing electrically conductive adhesives (ECAs), however, reduces shadowing effects.…”

“…Another way to reduce the cell interconnection losses is the reduction of string currents by interconnecting separated, that is, smaller, solar cells such as half cells [2][3][4][5][6][7][8][9][10] and shingle cells. 3,[11][12][13][14][15][16][17][18][19] Conventional shingling also increases the consumption of Ag 20 due to the necessity of Busbar and Ag containing electrically conductive adhesives (ECAs), however, reduces shadowing effects. Since increased recombination occurs at postfiring separated edges, the cell pieces cannot be chosen arbitrarily small and a compromise between the reduction of series resistance and increase of edge recombination must be found.…”