Summary
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4.1 Excess carriers, above the equilibrium values contributed by doping, may be created optically (or by electrical biasing in devices). Generation–recombination (G–R) of electron–hole pairs (EHPs) can occur by absorption of the photons with energy greater than the band gap, balanced by direct or indirect recombination.
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4.2 Generation–recombination processes can be mediated by traps, especially deep traps near midgap. Band-to-band or trap-assisted G–R processes lead to an average lifetime for the excess carriers. Carrier lifetime multiplied by the optical generation rate establishes a steady state excess population of carriers. The square root of carrier lifetime multiplied by the diffusion coefficient determines the diffusion ...
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