System features: the use of modulated light instead of DC light can reduce stray light, noise that are harmful to the measurement accuracy; The cone cavity type pyroelectric detector instead of thermopile detector as a reference detector, with a phase-locked measuring instrument instead of DC measuring instrument combined with temperature control can improve the sensitivity of the measurement system and the flatness of the spectral responsiveness; The stray light could be greatly reduced by dual monochromator instead of monochromator, and increase the absolute target of the spectral responsiveness at the same time. The system is of flexible deformation according to the customer needs. The system is suitable for IPCE test of solar cell, spectral response analysis of photoelectric device and other experiments.
Standard system components:
Introduction for solar cell quantum efficiency QE/ IPCE:
QE (Quantum efficiency) and IPCE (Incident Photon to Charge Carrier Efficiency) represent the ratio of the number of photons incident on the surface of the solar cell to the number of charge carriers generated by the solar cell. QE (Quantum efficiency) is a measure of the external efficiency for solar cells. IPCE (Incident Photon to Charge Carrier Efficiency) is a test of the internal efficiency for solar cells, that is, photons reflect on the solar cell surface are out of consideration.
QE/IPCE measurement is vital in solar cell materials research and solar cell design, as it is extremely important to have best spectral response at the solar spectrum with strong spectral distribution. QE/IPCE test equipment is based on light source and spectroscopy frontier technology, so it is reasonable to trust its professional test accuracy.
Determination of the irradiance intensity of the monochromatic light and the photogenerated current density by the solar cell is the key factor to the accurate measurement of QE/IPCE. QE/IPCE of the solar cell could be quickly completed with the key QE/IPCE testing components provided by Perfectlight.
This system is used to measure the spectral response of solar cells (A/W). The spectral responsivity is obtained by comparing short-circuit current values of the measured silicon detector (such as solar cells, dye-sensitized solar cells, Photodiodes, etc.) and the standard silicon detector under the same monochromatic light illumination. The spectral response data of the standard silicon detector are provided by the China Metrology Institute.
This system can realize the adjustment of monochromator slit, wavelength, lock-in amplifier (or weak current meter) gear, time constant, data measurement, data curve real-time display, data processing. Detailed function can be customized according to the special needs of users, 3 years free software upgrades maintenance).
This system is suitable for measurement at 300~1100 nm wavelength range, measurement uncertainty <5% (k = 2) (400-1100) nm
System main schematic diagram:
1．AC measurement method (suitable for fA level weak current signal)
2．DC measurement method (suitable for pA-level weak current signal)
(1) Model: CHF-XM500 (xenon lamp) Electric power 500W, multi-level focus, emission wavelength range: 200-2500nm, total optical power: 10W
(2) Halogen lamp and DC power supply for (800-1600) nm, flat wavelength, power 250W.
Model: omni3005, parameters: focus length 300mm, resolution 0.1nm, mechanical scanning range: 0-1200nm, wavelength accuracy: 0.2nm (near infrared grating (700-2000) nm).
It consists of two convex lenses and a filter wheel.
4、Standard UV detector
Silicon Detectors (Hamamatsu, 2 for backup)
5、Automatic control system and software
Including monochromator control, measuring instrument readings, data comparison, processing, VB program.
6、Measuring instruments (AC and DC measurements)
Locking Amplifier Model: SR830
Dual phase digital,
1mHz-102kHz frequency range
100dB dynamic reserve (without pre-filter)
Automatic gain, automatic phase, automatic dynamic reserve
10s-30ks time constant
6,12,18,24 dB/octave attenuation rate
Harmonic detection (2F, 3F ... nF)
GPIB, RS-232 interface
Modulator Model: SR540
Voltage control input, four digital frequency display, ten frequency control, and output with two optional operating modes.
4Hz-3.7kHz chopping frequency
Single beam and dual beam modulation
Low phase jitter
Same frequency and differential frequency reference signal output
Measuring instrument (DC measurement method)
Key Features and Virtues
Resistance measurement up to 1016Ω
Current measurement range 1fA-20mA
Minimum current range input voltage drop <20μV
200TΩ input impedance
<3FA bias current
Up to 125rdgs/sec
Noise 0.75fA p-p
Built-in ± 1kV power supply
Unique high resistance measurement voltage reversal method
Optional plug-in scanning card
7、Optical platform (optional)
Made in China, 1.2M * 1.8M, steel. Optical darkroom, rotary turntable, controller and one-dimensional control socket (3 parts).