Emitter wrap-through back contact solar cells on thin...

H - Electricity – 01 – L

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H01L 31/04 (2006.01) H01L 31/0368 (2006.01) H01L 31/05 (2006.01) H01L 31/06 (2006.01)

Patent

CA 2530684

A thin emitter wrap-through solar cell and method for making a thin emitter wrap~through solar cell. The cell preferably includes a silicon wafer substrate having a thickness of less than 280 microns. The p-type area on the back side of the cell is minimized, which maximizes the collector area and reduces or eliminates stress due to passivation of the p-type area, which is required for conventional solar cells. The efficiency of the cell of the present invention peaks for a much smaller thickness than that for conventional cells. Thus thin wafers of inexpensive, lower quality silicon may be used without a significant efficiency penalty, providing a large cost advantage over other solar cell configurations. Vias through the substrate, which connect emitter layers on the front and back surfaces of the substrate, may consist of holes which are doped, or alternatively may be solid doped channels formed by migration of a solvent, which preferably contains a dopant, caused by a gradient-driven process.

L'invention concerne une cellule solaire d'émetteur mince à contact arrière ainsi que son procédé de fabrication. De préférence, cette cellule solaire comprend un substrat à plaquette de 280 microns d'épaisseur maximum. La surface de type p située sur la surface arrière de la cellule solaire est réduite au minimum, ce qui profite à la surface de captage qui est maximisée et réduit ou supprime la contrainte exercée sur la surface de type p sous l'effet de la passivation, conformément aux exigences des cellules solaires classiques. Le rendement de la cellule solaire de l'invention est supérieur alors que son épaisseur est inférieure à celle des cellules conventionnelles. On peut ainsi utiliser des tranches fines, bon marché, à base de silicium de qualité inférieure sans pénaliser de manière importante le rendement, offrant ainsi un grand avantage de coûts sur les autres configurations de cellules solaires. Des trous traversants le substrat, lesquels connectent les couches de l'émetteur sur les surfaces avant et arrière du substrat, peuvent être des trous dopés, ou encore des canaux dopés solides formés par la migration d'un solvant, contenant de préférence un dopant, sous l'effet d'un processus à gradient.

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