Recombination Processes – Shockley-Read-Hall PVMD René van Swaaij Delft University of Technology
Three recombination processes Shockley- Radiative Auger Read-Hall - - - - - - + + +
Learning objectives • Underlying mechanism of Shockley-Read-Hall
Learning objectives • Underlying mechanism of Shockley-Read-Hall • Conceptualize carrier traps and processes
Learning objectives • Underlying mechanism of Shockley-Read-Hall • Conceptualize carrier traps and processes • Understand the recombination rate equation
Shockley-Read-Hall recombination - +
Shockley-Read-Hall recombination • Facilitated by impurities or lattice defects - +
Shockley-Read-Hall recombination • Facilitated by impurities or lattice defects - • Energy levels within bandgap +
Trap types Occupied Unoccupied
Trap types Occupied Unoccupied Donor-type
Trap types Occupied Unoccupied Donor-type 0
Trap types Occupied Unoccupied Donor-type 0 +
Trap types Occupied Unoccupied Acceptor-type Donor-type 0 +
Trap types Occupied Unoccupied Acceptor-type 0 Donor-type 0 +
Trap types Occupied Unoccupied Acceptor-type - 0 Donor-type 0 +
Carrier processes
Carrier processes 1. 1. Capture of electron - +
Carrier processes 1. 2. 1. Capture of electron - 2. Emission of electron + + -
Carrier processes 1. 2. 3. 1. Capture of electron - 2. Emission of electron + + - 3. Capture of hole +
Carrier processes 1. 2. 3. 4. 1. Capture of electron - 2. Emission of electron + + + - 3. Capture of hole 4. Emission of hole +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Process rates 1. 2. 3. 4. - + + + - +
Thermal velocity and capture cross-section Trap state
Thermal velocity and capture cross-section
Thermal velocity and capture cross-section -
Thermal velocity and capture cross-section -
Thermal velocity and capture cross-section -
Thermal velocity and capture cross-section Reach of trap -
SRH recombination rate
SRH recombination rate
SRH recombination rate
SRH recombination rate
SRH recombination rate
SRH recombination rate
SRH recombination rate n -type
SRH recombination rate n -type
SRH recombination rate n -type
SRH recombination rate n -type
SRH recombination rate p -type n -type
Recombination efficacy Recombination efficacy Trap energy
Recombination efficacy Recombination efficacy Trap energy
Recombination efficacy Recombination efficacy Trap energy
Summary
Summary Shockley- Radiative Auger Read-Hall
Summary Shockley- Radiative Auger Read-Hall - - - - - - + + +
Summary Shockley- Radiative Auger Read-Hall - - - - - - + + +
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