Responsivity Calculator

Calculate spectral responsivity from TMM-based quantum efficiency. Compare per-channel responsivity against the ideal silicon photodiode response.

Spectral Responsivity Calculator

Convert QE spectrum to spectral responsivity R(λ) = QE × qλ/(hc). Compare R/G/B channels with ideal Si photodiode.

Si Thickness: 3.0 μm

CF Bandwidth: 100 nm

Peak R (Red)

0.401 A/W

Peak R (Green)

0.369 A/W

Peak R (Blue)

0.246 A/W

Responsivity

Spectral responsivity converts QE to an electrical output metric:

R(λ) = QE(λ) × qλ / (hc) = QE(λ) × λ_nm / 1240 [A/W]

Where:

• q — electron charge (1.602 × 10⁻¹⁹ C)
• h — Planck's constant (6.626 × 10⁻³⁴ J·s)
• c — speed of light (2.998 × 10⁸ m/s)
• λ_nm — wavelength in nanometers

Per-Channel Response

Each color channel (R, G, B) has a distinct responsivity curve shaped by:

• Color filter transmittance spectrum
• Silicon absorption depth at each wavelength
• Anti-reflection coating efficiency
• Microlens collection efficiency

Ideal Si Photodiode

The ideal response assumes QE = 1 at all wavelengths:

R_ideal(λ) = λ_nm / 1240 [A/W]

TIP

Peak responsivity wavelength differs from peak QE wavelength because responsivity includes the λ/1240 factor, which shifts the peak toward longer wavelengths.