Quantum Efficiency Measurement Station

Quantum Efficiency Measurement StationIt is a complete experimental device used for studying the spectral response of solar cells. The sample is illuminated by a monochromatic beam generated by a grating, and there are two types of light sources at the entrance: xenon lamp and halogen lamp. The wavelength range of the two lamps covers UV, VIS, and IR light. Instruments with bias light extension can use standardized white AM1.5G light and air quality filters from additional xenon lamps to excite samples. Place the examined cells on an electric vacuum XY worktable with manual Z-axis offset. The measurement will be conducted in a darkroom, which will be set up to screen against ambient light and external electromagnetic fields. The incident light intensity is monitored by a dual band Si/InGaAs photodiode. All system components are automated and controlled through software.

Quantum Efficiency Measurement StationQuantity measured:

• I-V characteristics/

• Open circuit potential (OCP) under illumination,

• Spectral reflectance coefficient (R)/

• Spectral transmittance coefficient (T),

Characteristics:

• External quantum efficiency (EQE or IPCE),

• Internal quantum efficiency (IQE or APCE),

• Short circuit current density/

• Fill factor.

QE measurement station module

The system includes:

• Sample Room/

• Electric multi axis vacuum table with built-in photodiode,

• Integral ball/

• A grating with two entrance slits for automatic switching between light sources,

• The xenon lamp at the first entrance of Monocomartor,

• The halogen lamp at the second inlet of the monochromator,

• Phase locking for signal processing under test,

• Xenon lamp+AM1.5G filter (bias light extension)

Sample Room Interior

Photo current measurement/reflection magnetic flux measurement/built-in photodiode for transmission magnetic flux measurement

Specifications

Instrument performance may be customized according to specific requirements.

routine

• Total wavelength range: 200 ÷ 1650 nm,

• Adjustable white beam intensity on the sample: 0.01 ÷ 0.1 W/cm ²,

• Illumination uniformity: 10%,

xenon lamp

• 150 W xenon lamp,

• Water cooling system/

• Low electromagnetic emission igniter/

• Stable mode:

• - Stable current (distortion<1%),

• - Stable power supply,

• - Stable light intensity (a unique solution that provides constant sample illumination during the experiment),

• Maximum radiation intensity on the sample: 35 mW/cm2

halogen lamp

• The electrical power of halogen bulbs is 150 W,

• Reflector type: elliptical,

• Air cooling system/

Monochromator

• There are three gratings on the turntable, each optimized for a different wavelength range,

• Automatically switch gratings based on wavelength selection,

• Electric output and input slits, controlled by software,

• Two input slits for different light sources, switched through software,

• Entrance and output slit opening range: 0 ÷ 5 mm,

• Electric internal shutter, capable ofCut off the beam of light,

• Maximum spectral resolution: 0.1 nm (depending on input and output slit width),

• The Chopper at the output end,

Filter changer

• Placed at the entrance of the sample chamber,

• Up to 6 filters,

• By default, two edge (long pass) filters are provided: 400 nm and 600 nm,

detector

Dual band Si/InGaAs photodiodes are used to monitor incident light intensity, magnetic flux transmitted through the sample, and magnetic flux reflected by the sample.

lock

• Bias potential range: -5 V ÷ 5 V,

• Current range: 1 μ A, 10 μ A, 100 μ A, 1 mA, 10 mA, 100 mA

• Current resolution: from 1 pA to 100 nA (depending on the range),

• Maximum sampling rate: 1 kSample/s,

• Connected to PC: via USB 2.0,

• Simultaneously processing two photodiode inputs (reference photodiode and reflective/transmissive photodiode),

• DC and AC measurement modes,

• Input gain: x1, x2, x4, x8, x12

• Integral time: 1 ms ÷ 10 s.

Electric multi axis vacuum worktable

• Maximum sample size: 20 x 20 cm,

• Manually place the contact electrode at any position on the sample,

• Gold coating/

• Z-axis movement range: 12 mm (manual),

• Mobile accuracy: 0.01 mm,

• Built in detector for transmitted light detection,

• Adjustable stylus for photocurrent measurement,

• Integrated vacuum pump to keep the sample in a stable position.