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

Generation/Recombination Current PVMD René van Swaaij Delft University of Technology

Learning objectives • Reverse bias: generation current

Learning objectives • Reverse bias: generation current • Forward bias: recombination current

Learning objectives • Reverse bias: generation current • Forward bias: recombination current • The ideality factor

Space charge region under reverse bias p-type n-type E Cp E Fi E Fp E Cn E Vp E Fn E Vn

Space charge region under reverse bias p-type n-type E Cp E Fi E Fp E Cn E Vp qV R E Fn E Vn

Recombination in the space charge region

Detailed balance 1. 2. 3. 4. - + + + - +

Recombination in the space charge region

Reverse bias: generation current

Reverse bias: generation current Reverse bias:

Space charge region under reverse bias p-type n-type E Cp - - E Fi - E Fp E Cn E Vp E Fn + + + E Vn

Space charge region under reverse bias p-type n-type E-field E Cp - - E Fi - E Fp E Cn E Vp E Fn + + + E Vn

Reverse bias: generation current

Voltage dependence ln ( J ) ln ( J S ) V a

Space charge region under forward bias p-type n-type E Cp E Cn E Fn E Fi E Fp E Vp E Vn

Space charge region under forward bias p-type n-type E Cp E Cn E Fn E Fi qV a E Fp E Vp E Vn

Recombination rate through the space charge region Relative recombination rate -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Relative distance through space charge region

Recombination rate through the space charge region Relative recombination rate Maximum recombination -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Relative distance through space charge region

Forward bias: recombination current

Current in forward bias ln( J ) Recombination current, J rec (slope = ½) ln( J R 0 ) ln( J s )

Current in forward bias Ideal diffusion current, J D (slope = 1) ln( J ) Recombination current, J rec (slope = ½) ln( J R 0 ) ln( J s )

Current in forward bias Ideal diffusion current, J D (slope = 1) ln( J ) Total current Recombination current, J rec (slope = ½) ln( J R 0 ) ln( J s )

Summary • Generation current:

Summary • Generation current: • Recombination current:

Summary • Generation current: • Recombination current: • The ideality factor:

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

Generation/Recombination Current PVMD Ren van Swaaij Delft University of Technology Learning objectives Reverse bias: generation current Learning objectives Reverse bias: generation current Forward bias: recombination current

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