2_1_lecture12 - EE 2 Fall 2007 Class 13 slides 1...

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1 EE 2 Fall 2007 Class 13 slides
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2 Generation-recombination process (g-r process) Outline Introduction Definition of generation and recombination (g-r process) Band to band recombination process G-r center process Thermal equilibrium conditions Extrinsic semiconductor and minority carrier lifetime Excess carriers Continuity equation
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3 Generation –Recombination (g-r) Generation is the process by which free electron and free holes are created (generated). This is called the generation of electron-hole pairs since both the species are created during generation. Recombination is the process by which electrons and holes recombine and (therefore) are lost. In this sense recombination is opposite to generation. Energy needs to be given to the semiconductor for generation of electrons and holes. This energy can be thermal energy or optical energy or impact energy due to bombardment of the semiconductor by energetic particles. Energy is released from the semiconductor when recombination takes place. This energy can be in the form of heat or optical energy.
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4 Generation –Recombination (g-r) g-r rates Recombination rate
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