The average distance minority carriers diffuse before recombining, given by L = √(Dτ) from the diffusion coefficient D and lifetime τ. It strongly affects the efficiency of solar cells and photodetectors.
Field: Semiconductor physics
The diffusion length is roughly how far a minority carrier diffuses before recombining: L = √(Dτ).
With minority carrier diffusion coefficient D and lifetime …Making the base much thinner than the diffusion length shortens the transit time so nearly all carriers reach the collector, raising current gain and improving high-frequency performance.
What is the main reason for making the base of a bipolar tr…The characteristic diffusion length is √(Dt): multiplying cm²/s by seconds and taking the square root yields a length.
What is the correct unit of the diffusion coefficient D?Current gain (hFE) Punch-through Acceptor Auger recombination Band gap Degenerate semiconductor Donor Effective mass Einstein relation Electron affinity