'Electron concentrations' presentation slideshows

Excess carriers in semiconductors

Excess carriers in semiconductors. Optical absorption Luminescense Carrier lifetime and photo-conductivity Diffusion of carriers. Optical absorption. Photons with hv >E g will excite EHP and the excess energy ( hv -E g ) will be absorbed as heat. EHPs increase conductivity.

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Fig. 6. Electron concentrations within the active regions for the four LEDs at 180 mA .

Fig. 6. Electron concentrations within the active regions for the four LEDs at 180 mA. Fig. 7. Hole concentrations within the active regions for the four LEDs at 180 mA. Fig. 8. Radiative recombination rates within the active region for the four LEDs at 180 mA. Droop%. Con EBL=55.2%.

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Experiment

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