Product Code: 100134673

Address:

Chongqing,China

Main Products:

Light source,photochemical system,High-vacuum system,Analytic instruments

Contact Info.
Quantum Efficiency & monochromatic Incident Photon-to-electron Conversion Efficiency (QE&IPCE) test system
  • FOB Price
    Negotiable
  • Min. Order
    0 Piece(s)
  • Payment Terms
    -- --
  • Port
    -- --
  • Delivery Time
    0 days after payment
Product Description

System feature:
With modulated light instead of direct current light, this system can reduce the effects of environmental light and noise on the measurement accuracy. With the cone cavity pyroelectric detector instead of thermopile detector and phase-locked measuring instrument instead of DC measuring instrument, plus with the temperature controller, the sensitivity to spectra response of this system can be improved greatly. The system, with double monochromator, can reduce the stray light greatly and improve the calibration degree of spectra response. This system can be flexibly deformed and combined according to customer's demand. It can be used to test IPCE of solar cell and spectral response of photoelectronic devices.
 
Introduction of QE/IPCE for solar cell
Quantum Efficiency (QE) and monochromatic Incident Photon-to-electron Conversion Efficiency (IPCE) is defined as the ratio of number of generated charge carriers on number of incident photons hitting on a solar cell. Quantum efficiency can be considered as internal efficiency or external efficiency, according to the consideration or not consideration of photons reflected back from the surface of the cell.
The QE/IPCE of solar cell is a very important measure for solar cells as it gives information on the current that a given cell will produce when illuminated by a particular wavelength. It is critical especially during the materials research and cell design, because it is of great importance for a device to have an optimal spectral response where the spectral component of the sunlight is abundant. This system is set up by an enterprise with strong technologies in light sources and spectroscopy, who confirm the accuracy of measurement.
The key of QE/IPCE measurement is to quantify the intensity of monochromatic incident light hitting on the photovoltaic device and the photo-generation current. We provide the most general and important module for QE/IPCE measurement, which will allow customer to quickly set up the experiment. 
 
Introduction of the QE/IPCE system
The system can be used to measure the spectra responsivity. Principle: the spectra responsivity can be obtained by comparing the short-circuit current of sample silica detector and standard silica detector, with the help of monochromatic light irradiation origining from monochromator irradiation. The spectra responsivity data of standard silica detector was obtained from the Institute of metrology of China. This system has the functions of monochromator slit adjustment, wavelength adjustment, lock-in amplify (the weak current meter) adjustment, time constant adjustment, data measurement, and real-time display and processing of data. More functions can be customized according to customer's demands. The software of the system can be upgraded freely for 3 years.
The measurement range of wavelength is 300-1100 nm with uncertainty of <5% (k=2) (400-1100 nm)
 
 Configurations of system
1.  Light source
(1)   CHF-XM500 xenon light source with electric power input of 500 W and light power output of 10 W, multi-level focus, spectral range of 200-2500 nm
(2)   Halogen lamp with electric power input of 250 W, direct current power source,
2.  Monochromator
Model: omni3005
Focus: 300 mm
Resolution: 0.1 nm
The scan range: 0-1200 nm
Accuracy: 0.2 nm
3.  Optical system
The optical system consists of two convexes and filters.
4.  Standard detector of ultraviolet light
Three silica detectors (Hamamatsu, Japan)
Model: S1337 
5.   Autocontrol system and software
Including: monochromator controlling, display of measurement instrument, comparing and processing of data...
6.  Measurement instrument
Lock-in amplifier: SR830
Two-phase digital
Frequency range: 1 mHz-102 kHz
100 dB dynamic reserve (without pre-filter)
Automatic gain, automatic dynamic reserve
Time-constant: 10 s-30 ks
6, 12, 18 and 24 Frequency attenuation rate
Harmonic detector (2F, 3F... nF)
GPIB, RS0232 interface
Modulator model: SR540
With voltage control input, four digital frequency input, 10-band control, two type of selectable operating modes output
4 Hz-3.7 kHz Chopper frequency
Single light beam and double light beam modulation
Low phase jitter
Sum-frequency and difference frequency output
Measurement instrument (direct current measurement)
Keithley 6517A
7.  Features
Measurement resistance: -1016 ohm
The range of measurement current: 1fA-20 mA
The volt drop with minimum input current range: <20 microvolt
Impedance input: 200 T-ohm
Bias current: 3fA
Up to 125 rdgs/s
Noise: 0.75 fA p-p
Internal power source: ±1 kV
Unique high-resistance volt measurement method
Optional plug-in scanner cards
8.  Optical table (optional)
The optical table consists of optical dark room, rotating turntable, controller, and 3 one-dimension adjustments. The table is made in china with dimension of 1.2×1.8 m