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CRYSTALLINE SILICON SOLAR CELLS 267<br />

p substrate<br />

p substrate<br />

p + BSF<br />

p + BSF<br />

Metal<br />

Metal<br />

Passivating layer<br />

(a)<br />

(b)<br />

p substrate<br />

p substrate<br />

p ++ p ++<br />

Metal<br />

Passivating layer<br />

Metal<br />

Passivating layer<br />

(c)<br />

(d)<br />

p substrate<br />

p substrate<br />

p ++<br />

n +<br />

p + or n +<br />

(e)<br />

Metal<br />

(f)<br />

Figure 7.4 Rear contact structures: (a) continuous BSF; (b) bifacial cell; (c) local BSF; (d) local<br />

BSF, bifacial cell; (e) selective emitter or floating junction passivation; and (f) shorted junction at<br />

the back face of industrial cells

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