01ECE108Ch1SemiconductorDevicePhysicsreview

01ECE108Ch1SemiconductorDevicePhysicsreview - 1...

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1. Semiconductor Device Physics Review Ece 108 1 Esener ECE108
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1. 1. CURRENT TRANSPORT 2 Esener ECE108 1.1.1.Carrier lifetime and mobility When holes and electrons interact they recombine. The average time they can exist in the S/C system before recombination is called carrier lifetime . e - h pairs are generated if different types of energies (heat, light) are applied to the S/C system. When an E -field is applied to the system, a force F is applied to the carriers. F = q E m dv dt = qE v 2245 q m t E v = m E (Under very simplifying assumptions) where m = mass of the carrier τ = carrier lifetime μ = mobility ν = velocity t is a function of - electron and hole scattering Impurities => Doping concentration N A , N D Crystalline Defects Applied Energy - Heat (phonons) - E -field
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Carrier Mass and Mobility Esener ECE108 3 The mass m is a function of the Carrier Type m h = m e At high electric fields due to scattering the carrier lifetime can become very short
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01ECE108Ch1SemiconductorDevicePhysicsreview - 1...

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