PVMD Delft University of Technology Learning objectives External - PowerPoint PPT Presentation

External Quantum Efficiency René van Swaaij PVMD Delft University of Technology

Learning objectives • External Quantum Efficiency (EQE)

Learning objectives • External Quantum Efficiency (EQE) • Internal Quantum Efficiency (IQE)

Learning objectives • External Quantum Efficiency (EQE) • Internal Quantum Efficiency (IQE) • Obtaining J SC from EQE

Learning objectives • External Quantum Efficiency (EQE) • Internal Quantum Efficiency (IQE) • Obtaining J SC from EQE • Typical EQE measurement setup

Definition External Quantum Efficiency: ratio of the collected electron-hole pairs to the number of incident photons

Definition External Quantum Efficiency: ratio of the collected electron-hole pairs to the number of incident photons _ _ _ ++ +

EQE and IQE EQE

EQE and IQE EQE Reflectivity

EQE and IQE IQE EQE Reflectivity

From EQE to Jsc

From EQE to Jsc 0 1 2 3 4 5 6 φ(λ) [10 18 s -1 m -2 nm -1 ]

From EQE to Jsc 6 5 φ(λ) [10 18 s -1 m -2 nm -1 ] 4 3 2 EQE (λ) · φ (λ) 1 0

From EQE to Jsc 6 40 35 5 30 φ(λ) [10 18 s -1 m -2 nm -1 ] %&& [mA cm -2 ] 4 25 3 20 ) $ 15 J SC (∫ 2 10 EQE (λ) · φ (λ) 1 5 0 0

EQE testing setup Xenon lamp

EQE testing setup Xenon lamp Chopper wheel

EQE testing setup Xenon lamp Mono- chromator Chopper wheel

EQE testing setup Solar cell Xenon lamp Mono- chromator Chopper wheel

EQE testing setup Solar cell Xenon lamp Mono- chromator Lock-in Amplifier Chopper wheel

EQE testing setup Solar cell Xenon lamp Mono- chromator Lock-in Amplifier Chopper wheel Computer

EQE testing setup Reference diode Xenon lamp Mono- chromator Lock-in Amplifier Chopper wheel Computer

Lock-in Amplifier Reference

Lock-in Amplifier Reference Signal

Lock-in Amplifier Reference Signal Lock-in

Lock-in Amplifier Phase Sensitive Detection:

Summary EQE is the ratio between the collected charge carriers per • second and the incident photons per second, per wavelength

Summary EQE is the ratio between the collected charge carriers per • second and the incident photons per second, per wavelength J SC obtained by multiplying the EQE and light spectrum •

Summary EQE is the ratio between the collected charge carriers per • second and the incident photons per second, per wavelength J SC obtained by multiplying the EQE and light spectrum • Lock-in amplifier to detect low amplitude signal from noise •

PVMD Delft University of Technology Learning objectives External - PowerPoint PPT Presentation

External Quantum Efficiency Ren van Swaaij PVMD Delft University of Technology Learning objectives External Quantum Efficiency (EQE) Learning objectives External Quantum Efficiency (EQE) Internal Quantum Efficiency (IQE) Learning

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