Working Principle of a Semiconductor Based Solar Cell Transport of - PowerPoint PPT Presentation

Working Principle of a Semiconductor Based Solar Cell Transport of Charge Carriers Week 2.3.3 Arno Smets

Diffusion Drift E-Field

Random movement = no net movement

J e = qD e dn/dx Diffusion density

Diffusion J e = qD e dn/dx density

Diffusion J e = qD e dn/dx density

Diffusion dn/dx=0 J=0 density

Drift Electron E-Field Hole

Drift Density Current density Charge Mobility Electric field J h = pq h E J e = nq e E

Drift Electron E-Field Hole

Diffusion Drift E-Field

Charge Carrier Recombination Recombination

Charge Carrier Recombination Radiative recombination

Charge Carrier Recombination Auger recombination

Charge Carrier Recombination Shockley-Read-Hall (SRH) recombination

Diffusion Length L h L e L = D t

Diffusion Length L h L e L = D t

Diffusion Length L h L e L = D t

Diffusion Length Transport by diffusion limited by minority carriers - - - - - - - - - - - - p-doped Diffusion length: L e = D e t e < L h

Diffusion Length Transport by diffusion limited by minority carriers - - - - + + + + - - - - + + + + - - - - + + + + p-doped n-doped Diffusion length: L e = D e t e < L h    L D L h h h e

Diffusion Drift E-Field

Thank you for your attention!

Thank you for your attention!