Solar Cell Operation, Performance and Design Rules Spectral - PowerPoint PPT Presentation

Solar Cell Operation, Performance and Design Rules Spectral Utilization I - External Quantum Efficiency Week 3.3.2 Arno Smets

Design Rules Solar Cells 1. Bandgap Utilization Delicate Interplay 2. Spectral Utilization 3. Light Trapping

Light Absorption

C V

10 Current Density (mAcm -2 ) 0 -10 -20 J sc V oc 30 -40 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltage (V)

C V

10 Current Density (mAcm -2 ) 0 -10 -20 J sc V oc 30 -40 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 Voltage (V)

External quantum efficiency  (  )  J ( ) q   EQE ( )   ( )  J(  )/q

External quantum efficiency Quantum efficiency 1.0 Ideal quantum efficiency Wavelength

Computer Grating Xe lamp monochromator Monitor cell Lock-in Amplifier 1 Optical fibre Chopper Wheel with ‘ grey ’ filters Lock-in Amplifier 2 Bias light Test device

Computer Grating Xe lamp monochromator Monitor cell Lock-in Amplifier 1 Optical fibre Chopper Wheel with ‘ grey ’ filters Lock-in Amplifier 2 Bias light Test device

Computer Grating Xe lamp monochromator Monitor cell Lock-in Amplifier 1 Optical fibre Chopper Wheel with ‘ grey ’ filters Lock-in Amplifier 2 Bias light Test device

Computer Grating Xe lamp monochromator Monitor cell Lock-in Amplifier 1 Optical fibre Chopper Wheel with ‘ grey ’ filters Lock-in Amplifier 2 Bias light Test device

Computer Grating Xe lamp monochromator Monitor cell Lock-in Amplifier 1 Optical fibre Chopper Wheel with ‘ grey ’ filters Lock-in Amplifier 2 Bias light Test device

External quantum efficiency         J ( V 0 V ) q ( ) EQE ( ) d SC AM 1 . 5 0    P ( )     AM 1 . 5 q EQE ( ) d hc 0

External quantum efficiency         J ( V 0 V ) q ( ) EQE ( ) d SC AM 1 . 5 0    P ( )     AM 1 . 5 q EQE ( ) d hc 0

Relation EQE and J sc 2.00 70 AM1.5 1.75 J SC (EQE=1) mAcm -2 60 P(  ) Wm -2 nm -1 1.50 50 1.25 40 1.00 30 0.75 20 0.50 10 0.25 0 0.00 2000 0 500 100 150 0 0 Wavelength (nm)

Relation EQE and J sc 2.00 70 AM1.5 1.75 J SC (EQE=1) mAcm -2 60 P(  ) Wm -2 nm -1 1.50 50 1.25 40 1.00 30 0.75 20 0.50 10 0.25 0 0.00 2000 0 500 100 150 0 0 Wavelength (nm)

Example 2.5 P(  ) (10 9 Wm -2 nm -1 ) 2.0 1.5 1.0 0.5 0 2000 0 500 100 150 0 0 Wavelength ( x 10 -9 m)

Example 2.5            15 9 2 1 300 nm 500 nm P ( ) 7 . 5 10 2 . 25 10 [ Wm m ] P(  ) (10 9 Wm -2 nm -1 ) 2.0            9 15 2 1 500 nm 1500 nm P ( ) 2 . 25 10 1 . 5 10 [ Wm m ] 1.5 1.0 0.5 0 2000 0 500 100 150 0 0 Wavelength ( x 10 -9 m)

Example 2.5   7 13 10 m   P(  ) (10 9 Wm -2 nm -1 )     2 I P ( ) d 900 [ Wm ] 2.0   7 3 10 m 1.5 1.0 0.5 0 2000 0 500 100 150 0 0 Wavelength ( x 10 -9 m)

Available power in the sunlight 2.00 1000 1.75 Irradiance I (Wm -2 ) P(  ) (Wm -2 nm -1 ) 1.50 900 Wm -2 800 1.25 600 1.00 0.75 400 0.50 200 0.25 0 0.00 3500 4000 0 500 100 150 2000 2500 3000 0 0 Wavelength (nm)

1.0 0.9 0.8 0.7 0.6 EQE 0.5 0.4 0.3 0.2 0.1 0.0 200 400 600 800 1000 120 1400 0 Wavelength ( x 10 -9 m)

1.0 2.5 0.9 P(  ) (10 9 Wm -2 nm -1 ) 0.8 2.0 Example 0.7 1.5 0.6 EQE 0.5 1.0 0.4 0.3 0.2 0.5 0.1 0.0 0 0 500 1000 2000 1500 200 400 600 800 1000 1200 1400 Wavelength ( x 10 -9 m) Wavelength ( x 10 -9 m)     7 7 11 10 m 11 10 m                     J e ( ) EQE ( ) d EQE e ( ) d EQE e ( ) sc   300 500 nm 500 1100 nm     7 7 3 10 m 3 10 m               19 20 2 1 21 2 1 2 0 . 9 1 . 6 10 ( 3 . 28 10 m s 2 . 41 10 m s ) 394 [ Am ]     2 2 394 [ 1000 mA /( 10000 cm )] 39 . 4 [ mAcm ]

1.0 2.5 0.9 P(  ) (10 9 Wm -2 nm -1 ) 0.8 2.0 Example 0.7 1.5 0.6 EQE 0.5 1.0 0.4 0.3 0.2 0.5 0.1 0.0 0 0 500 1000 2000 1500 200 400 600 800 1000 1200 1400 Wavelength ( x 10 -9 m) Wavelength ( x 10 -9 m) EQE = 100% J sc = 43.7[ mAcm - 2 ]

Relation EQE and J sc 2.00 70 AM1.5 1.75 J SC (EQE=1) mAcm -2 60 P(  ) Wm -2 nm -1 1.50 50 1.25 40 1.00 30 0.75 20 0.50 10 0.25 0 0.00 2000 0 500 100 150 0 0 Wavelength (nm)