lecture35 - Lecture 35 Monday May 2 EE 332 Semiconductor...

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Lecture 35 Monday May 2 EE 332 Semiconductor Devices Problem Assignment Monday Æ 11.8 and 11.9 Chapter 11 - Optoelectronic Devices When photons transverse a semiconductor, electron-hole pares are created if the photon energy is greater than the bandgap. The charge carriers resulting from electron-hole pairs that are photo generated within one diffusion length of the depletion region can diffuse to the depletion region where the minority carriers are swept across the depletion region by the electric field . Thus EH pairs generated in this region will contribute to the current across the reverse biased diode. Mathematics of Absorption The number of photons being absorbed per centimeter is just proportional to the number of photons present, thus: () ( ) t coefficien absorption 0Fln )(Fln (x) F dF )0(F)(F )(F dx L = −= α x e Absorption Coefficient
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A Generic Photodiode n + layer on the top is used solely to collect photo-electrons. The mean free path for electrons is small so the n + region is made thin so half the
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lecture35 - Lecture 35 Monday May 2 EE 332 Semiconductor...

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