The modular design of the steady-state solar simulator is closely related to the user's needs, economical and flexible, and suitable for a wide range of applications. It is very convenient to upgrade, renovate and maintain. The solar cell spectrum test system can be equipped with high-power tungsten halogen lamps and high-power xenon lamps. It can use the light source that the user has or refers to to ensure good wavelength accuracy and repeatability, eliminate the influence of multi-level spectrum, small stray light, super 1 strong and weak signal processing capability, and effectively improve the signal-to-noise ratio.
Guaranteed measurement accuracy A variety of patented sample holders are available for selection, convenient clamping, good electrode contact, and low interference to weak signal testing. Independent research and development of high-performance weak signal processor, including DC-blocking preamplifier, effectively isolates the DC component generated by polarized light, and can automatically switch all controls and signals. The solar cell spectrum test system is complete and fully automated.
Steady-state solar simulator evaluation criteria:
1. Spectral matching
The spectral matching standard specifies the integral percentage of the solar simulator in the six spectral ranges, and the spectral deviation of the solar simulator must be within the range specified by the corresponding standard. Class A standards are specified between 75% and 125%.
In order to achieve the corresponding standard for the solar simulator spectrum matching, a suitable filter can be used, and the appropriate filter can re-integrate the light without any treatment to change the spectral distribution to meet the corresponding standard requirements.
2. Radiation spatial uniformity
For solar simulators, uniformity of radiation in the work area is the most difficult to achieve. Uneven radiation can lead to erroneous solar cell efficiency and affect the packaging of solar cells. The Class A solar simulator minimizes this effect, and the steady-state solar simulator radiation uniformity is strictly controlled within ±2%.
3. Time stability
The time stability of the steady-state solar simulator output light is to ensure that fluctuations in light intensity do not affect the measurement of solar cell efficiency. The optical density control system can control the light intensity fluctuation of the solar simulator within 1%, even if there is no optical density control system, the corresponding standard can be achieved.
Steady-state solar simulator operating rules
(1) The instrument has a particularly high humidity requirement. Before starting the machine, the dehumidifier must be used to maintain the humidity in the operating room below 50c/o. (i Note: If the simulator's light source is used for a long time and needs to be calibrated with a standard silicon battery, the instrument owner is required to operate.)
(2) Turn on the simulator main unit switch, then turn on the power switch, press the “Lanp Start” button to turn on the light source, and wait for the instrument to stabilize for 15 minutes before proceeding to the next step.
(3) Open the test computer, then open the switch of the Keithley SourceMeter, and click the “PVIV” test software on the desktop of the computer.
(4) The assembled battery test fixture clamps the two poles of the battery. The red and black clips do not have the positive and negative poles, but the two clips are placed on the electrodes.
(5) Click Configure in the “PVIV” test software, and then gradually set the parameters. Enter the actual area value of the battery in the Sample Area item, enter the bias value to be applied in the Rev. Bias and Forward Bias debuts, and the price of the two values should be on both sides of the 0 point. , to cover the value of the open circuit voltage.