PVMD Ren van Swaaij Delft University of Technology Three - PowerPoint PPT Presentation

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. - + + + - +

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 Reach of trap -

SRH recombination rate

SRH recombination rate n -type

SRH recombination rate p -type n -type

Recombination efficacy Recombination efficacy Trap energy

Summary

Summary Shockley- Radiative Auger Read-Hall

Summary Shockley- Radiative Auger Read-Hall - - - - - - + + +

PVMD Ren van Swaaij Delft University of Technology Three - PowerPoint PPT Presentation

Recombination Processes Shockley-Read-Hall PVMD Ren van Swaaij Delft University of Technology Three recombination processes Shockley- Radiative Auger Read-Hall - - - - - - + + + Learning objectives Underlying mechanism

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