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go PV 3. Crystalline Silicon Solar Cells What is a solar cell? (n) c-Si + p-n junction . (p) c-Si • Intrinsic (pure) semiconductor material (e.g. Si). . • - Doped with impurities to become conductor -> +(p) or (n) charges transporting the current. Under light → absorption of photons if hv > Eg (Eg: semiconductor bandgap). Photogenerated carriers move towards the junction and cross it. EPFL Anti-reflective coating Top electrode (p) c-Si absorber p h+ e www Load V Bottom electrode + A J. Hurni (2022) Metallic contacts extract the current GoPV Project | SUMMER SCHOOL 8 PV SYSTEMS TECHNOLOGIES AND DESIGN

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