Photodiode

Reverse-biased pn junction. Photons with hν > E_g create e-h pairs in the depletion region. Photocurrent flows opposite to the diode forward current.

N_A (cm⁻³)

N_D (cm⁻³)

V_reverse (V) — negative

λ — wavelength (nm)

P_opt — optical power (mW)

Temperature (K)

E_c E_v Photons ↓

✍ Derivation — click to expand ▶