Question

4) Select the expressions that describe the four main recombination mechanisms for semiconductors for direct and indirect Auger and surface recombination, from the following list and indicate which expression relates to which type of recombination. Define each term: I = 1/ Vth Or Nur S= Vth Our Ntr To 1/NA in p-type material R = Bn’p or Bp?n

Answer 1

Dear student, please find the answer in the attachment.

Answers As we know that, recombination is the opposite process to generation. An electron recombines with a hole and gives up the energy to produce either heat or light e.g. LED 1. There are three types of recombinations. TT Auger fRadictive ) Shockley - Read -Hall recombination recombination recombination oo Ec ) trap assisted recombination Auger recombination band to band recombination 8=1th Sto Neo txt/NA inp-type material R = Bn²p or Bp²n 1 T. - - - Vth Stanto where Ntg - Density Vth - Thermal velocity, 6ty - Captured cross-section - Recombination lifetime n-electron concentration Pe hole concentration, B - Radiative recombination rate

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