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sci.semiconductor-bandgap-photon Calculator
Calculates the photon energy threshold for absorption in a semiconductor from bandgap: E_photon ≥ E_g, and minimum wavelength for absorption. GaAs (Eg = 1.42 eV) absorbs all photons below λ = 874 nm — the direct bandgap enables efficient LED and laser emission that silicon (indirect bandgap) cannot provide.
Inputs
Eg Ev
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
T K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Alpha Varshni Ev K
Reference formula or conversion factor shown for context.
Beta Varshni K
Reference formula or conversion factor shown for context.
Results
bandgap at T (eV)
The value at the specified point or condition.
cutoff wavelength λ_max (nm)
The computed linear length.
intrinsic carrier factor (relative)
A dimensionless multiplier applied in the calculation.
Eg(T) = Eg(0) - αT²/(T+β)
Reference formula or conversion factor shown for context.
material
The value at the specified point or condition.
photovoltaic optimum
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).