Solar Cell and PV Module Spectral Response/Quantum Efficiency Measurement System

Model : MSR

MSR-series is a spectral response measurement system exclusively designed by Enli Tech and fully compatible with IEC 60904-8:2014. The unique full-cell (156 X 156 mm2) illumination, can measure the spectral response of the commercial solar cell and PV module. This resolves the situations when localized-area measurement or mapping results might misrepresent the whole cell. It is now implemented by target research centers and major cell manufacturers to improve the conversion efficiency of solar cells. The two main application fields are followings:

◆ For Cell level
MSR-series can provide full-size illumination of highly homogeneous monochromatic beam and cell bias light on 6-inch solar cell. This system can perform spectral response result of commercial cells and the calibration source was directly traced from Fraunhofer ISE. On the other hand, Enlitech also provide highly accuracy WPVS-calibration function which can be calibrated by PTB to reduce measurement uncertainty.


156 mm x 156 mm illumination area.

◆ For Module level
According to IEC 60904-8:2014, to measure the spectral response of PV module, the target cell should be limit and cell was under short circuit condition. Hence, the output current of the module is limited by the photocurrent of the target cell(Figure. 2), i.e. the white bias light plus the additional monochromatic light generate less photocurrent in target cell than other cells in the string generates for the applied supplemental bias light.Secondly, to let target cell be short circuit condition, the additional bias voltage should be determined by I-V curve method and applied to target cell.


Principle of module spectral response measurement.

Items Specifications
Lamp System a. Measurement wavelength range: 300-1200 nm.
b. 150 W Xenon lamp.
c. Xe lamp instability< 0.5 %.
Monochromator a. 1/8m Czemy-Turner multi-grating monochromator .
b. Wavelength extending to 1800 nm. (Option)
c. Spectral resolution: 0.2 nm. (with 1200g/mm grating)
d. Automatic grating-change by software.
e. Low stray light design < 10-5
Automatic Filter wheel. a. 4 filters, max 6 pieces capability.
b. Stray-light elimination.
Optical system a. High-efficiency integrated optics system.
b. Monochromatic light illumination area ≥ 156 X 156 mm2
c. Monochromatic light uniformity ≥ 95 % ( 156 X 156 mm2)
Chopper a. Frequency: 4-200 Hz (adjustable).
Electrical system a. Dual channels DSP Lock-in-Amplifier .
b. 5 Amps/5 V DC capability, which is applied to the cell to set the voltage across the cell to the short-circuit condition. (less than 20 mV or 5 % of Voc)
c. Extend Max filtering current capability to 10 Amp). (option)
d. Extend max IV scan to 10 Amp. (option)
Bias Light module
  • Cell level
a. Class CCA (According to IEC 60904-9)
b. Illumination area ≧156 x 156 mm2
c. Intensity: 0~ 500 W/m2 (up to 1000 W/m2)
d. Uniformity ≧ ± 90 % ( 156 x 156 mm2)
  • Module level
a. Class C spectrum.
b. Illumination area is 2 m x 0.3 m (adjustable to full size of PV module).
c. Intensity adjustable 0~0.3 sun (up to 1 sun by option).
Reference cell a. 6-inch mono-Si reference cell.
b. Calibration by Fraunhofer ISE.
d. Si detector 300-1100 nm. (option)
e. Ge detector 900-1700 nm. (option)
f. WPVS reference cell. (option)
Sample stage system a. 6 inch vacuum conductive plate stage & probe .
b. Vacuum suction with vacuum pump .
c. Four Kelvin probe for contacting up to 3 bus bars .
d. TE cooling design and computer controlled for 6 inch cell .
e. Stage temperature range 25 ± 1.
f. Temperature accuracy: ± 0.5.
Temperature control system a. Active fan cooling system method for PV module.
b. PT-100 temperature sensor .
c. IR temperature sensor. (option)
Motion control system a. 1-axis stepping motor driver and one motion control joystick.
b. Manual control for module moving.
c. utomatically SR measurement by software settings. (option)
I-V tracer for MSR a. 50 V/5 A
EL image system a. 1.3 M Pixels camera
b. 8 M pixels camera (option)
Computer system a. With OS, monitor and keyboard
Software a. System control and data-save.
b. Auto calibration function.
c. Auto SR/EQE measurement function.
d. AM1.5G/AM1.5D short-circuit current density calculation .
e. Data save in txt files for easy import into spreadsheets .
f. Auto Vb calculation function and apply bias voltage to the cell to set the voltage across the cell to the short-circuit condition according to IEC 60904-8. (option)
g. Auto-mapping function to identify the location of module. (option)
h. Auto-mapping temperature measurement function.(option)
Spectral Mismatch Factor calculation function a. Spectral mismatch factor calculation based on IEC.
b. Import other spectral data to calculate mismatch factor based on IEC 60904-7.
c. Input I-V curve to correct mismatch factor.
Electrical Supply Requirement a. 3 breaks for 220-240 Vac/ 50 Hz /Single phase 50 Amps.
b. 1 breaks for 380~400 Vac/50 Hz/ 3 phase/ 20 Amps.
Safety Systems a. No Fuse Breaker, max 50 Amps
b. Electricity Leakage Breaker
c. 3kVA UPS system. (option)
Installation and Training a. On-site installation and training of the system
One Set of Spare Parts for one year a. 150 W Xe lamp (Lamp system ), x 1
b. Spot Bias light 1 set.
c. Supplemental Bias light lamp 1 set.

- Full-size illumination for 6-inch (156 x 156 mm2) solar cell with non-uniformity≦± 5% (Fraunhofer ISE≦± 10% ) 

- Measures 6-inch commercial solar cells and PV modules up to 2 m x 1.2 m in size.

- Ability of WPVS-reference cell calibration. (Option)

Wavelength:300-1200 nm (extend to 1800 nm for P-mode) with spectral resolution < 10 nm.

- The intensity of supplemental bias light³0.3 sun. (option up to 1 sun)

Non-destructive cell measurements and 5 A current protection for experimental modules.

- Quickly scan than traditional small beam mapping method.

Automatically bias voltage function and bias capability -100 V to +100 V(Can satisfy crystalline and thin-film module).

- EL mapping, Jscanalysis and defect Characterization.

- Compliances with IEC 60904-7 and IEC 60904-8:2014

 irradiance-mode operation

Full illumination area for 6-inch solar cell


◆ Comparison of calibration source form WPVS cell and 6inch cell from ISE

The comparison results from WPVS and 6-inch cells

◆ Repeatability of6-inch solar cell

The non-repeatability of 6-inch solar cell was less than 0.1 %

 Repeatability of PV module

 The non-repeatability of MSR was less than 1 %

EL-auto mapping function and analysis

 Quickly determination the worse cell in a PV module

◆ MSR-Series can be customized according to customer's needs.

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