Centrale solare termodinamica

Workings of a solar cell

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Semiconductor crystal

Semiconductor crystal

Energy bands

nSi=8.6  x  109  cm-­‐3

Doping

Equilibrium carrier concentration

intrinsic

n type

p type

Equilibrium carrier concentration

Photon absorption

Absorption coefficient

Absorption depth

Semiconductor crystal

Carrier recombination

Carrier recombination

Surface defects

Carrier movement in semiconductors

Carrier diffusion

Carrier drift

p-n junction

Diode characteristics

�

Jdark V( ) = J0 eqVkT −1

⎛

⎝ ⎜

⎞

⎠ ⎟

Workings of a solar cells

Workings of a solar cells

Quantum efficiency

Spectral response

Workings of solar cells

Workings of a solar cells

Solar cell characteristics

�

J V( ) = Jsc − Jdark V( ) = Jsc − J0 eqVkT −1

⎛

⎝ ⎜

⎞

⎠ ⎟

Voc =kTqln Jsc

J0+1

⎛

⎝ ⎜

⎞

⎠ ⎟

Fill factor

Efficiency