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

Recombination Processes – Radiative & Auger PVMD René van Swaaij Delft University of Technology

Learning objectives • Identify three recombination processes

Learning objectives • Identify three recombination processes • Conceptualize underlying mechanisms

Learning objectives • Identify three recombination processes • Conceptualize underlying mechanisms • Understand their recombination rates

Recombination - definition - Recombination +

Recombination - definition - Recombination annihilation of free charge carriers +

Three recombination processes

Three recombination processes Radiative - +

Three recombination processes Radiative Auger - - - - - + +

Three recombination processes Shockley- Radiative Auger Read-Hall - - - - - - + + +

Radiative recombination • Energy emitted as photon - +

Radiative recombination • Energy emitted as photon - • +

Radiative recombination • Energy emitted as photon - • • Important for direct bandgap + materials

Radiative recombination rate

Radiative recombination rate n -type under low-level injection:

Radiative recombination rate n -type under low-level injection: n -type

Radiative recombination rate n -type under low-level injection: n -type p -type 𝑆 d = 𝛾𝑞 0 (𝑜 − 𝑜 0 )

Three recombination processes Shockley- Radiative Auger Read-Hall - - - - - - + + +

Auger Recombination Energy transferred to third particle - - +

Auger Recombination - Energy transferred to third particle - - Third particle excited deeper into band +

Auger Recombination - Energy transferred to third particle - - - Third particle excited deeper into band Energy lost by thermalization +

Auger Recombination Electron-Electron-Hole - - - - +

Auger Recombination EEH - - - - +

Auger Recombination EEH Electron-Hole-Hole - - - - - + + + + +

Auger Recombination EEH EHH - - - - - + + + + +

EEH and EHH recombination rate EEH

EEH and EHH recombination rate EEH EHH

EEH and EHH recombination rate EEH EHH Auger

Auger recombination rate

Auger recombination rate Strongly doped n -type Low-level injection

Auger recombination rate Strongly doped n -type Low-level injection 𝒐 -type

Auger recombination rate Strongly doped n -type Low-level injection 𝒐 -type 𝒒 -type

Auger recombination rate Strongly doped n -type Low-level injection 𝒐 -type 𝒒 -type 2 𝑜 𝑆 Aug ≈ 𝐷 𝑞 𝑂 𝐵

Overview

Overview Shockley- Radiative Auger Read-Hall

Overview Shockley- Radiative Auger Read-Hall - - - - - - + + +

Overview Shockley- Radiative Auger Read-Hall - - - - - - + + + Next video

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

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