Under the "microscope" in the photovoltaic laboratory, temperature is a more secretive "variable assassin" than light intensity - it can distort the Voc curve of TOPCon cells by 1.5mV in a
temperature difference of 0.5 ℃, causing the FF value of HJT cells to drift by 0.8% due to a deviation of 1 ℃. The SOFN Instruments 7-SCT2 solar cell IV test temperature control table brings
photovoltaic testing into a new era of "nanoscale temperature control" with a maximum temperature control accuracy of ± 0.05 ℃ and a transient response speed of 0.01 ℃/s, making each
set of IV data a "truth slice" that directly points to the intrinsic characteristics of the material.
1、 Extreme temperature control: "Triple dimensional breakthrough" behind ± 0.05 ℃
When photovoltaic testing enters the era of "millivolt competition", 7-SCT2 reconstructs the temperature control boundary with disruptive technology:
Quantum level Peltier cooling matrix
Adopting a cascaded architecture of 24 micro Peltier chips, combined with liquid metal thermal interface material (TIM), infinite temperature control with 0.01 ℃ step is achieved. Combined
with dual core digital PID algorithm and feedforward compensation technology, the steady-state temperature fluctuation is compressed to ± 0.05 ℃ (20 times higher than IEC standard). In the
development of a certain perovskite battery, the temperature control table reduced the measurement error of the dark state Voc temperature coefficient from ± 0.3mV/℃ to ± 0.04mV/℃, helping
customers discover a new jump point in material carrier mobility.
Dual mode thermal isolation using vacuum and magnetic levitation
The original vacuum adsorption+magnetic levitation non-contact bearing technology completely eliminates contact thermal resistance and mechanical stress interference through a 0.1Pa level
vacuum chamber and magnetic levitation table. A flexible CIGS battery test showed that the design achieved a surface temperature uniformity of 0.08 ℃/cm ², and the temperature gradient
error caused by bending deformation was reduced from ± 1.2 ℃ to zero, with an increase in Isc repeatability to ± 0.08%.
Diamond coated thermoelectric isolation base
The tabletop adopts a 15mm thick CVD diamond coated copper base (thermal conductivity of 2000W/m · K), with a surface coated with a 10 μ m superconducting gold film and a resistivity of<1.68 μ Ω· cm.
It serves as a high-precision back electrode and achieves "zero thermal resistance" thermal conduction. In heterojunction battery testing, the pedestal reduced the measurement error of Rs from ± 0.5m Ω to ± 0.03m Ω,
allowing the true value of FF to exceed the theoretical threshold of 98%.
2、 Scene Revolution: From Laboratory "Deep Space Level" Simulation to Production Line "Millisecond Level" Quality Control
7-SCT2 runs through the entire photovoltaic industry chain with a "one machine multi state" design:
Deep Space Level R&D Tool
In the 7-SCSpec-X hyperspectral response testing system, a "gold standard combination" is formed between 7-SCT2 and SOFN Instruments' 7-SSC Pro standard battery. The dark current noise of the spectral response
test is suppressed to the aA level through ± 0.05 ℃ temperature control, resulting in an accuracy of 0.01mA/cm ² in the current matching analysis of each sub cell of the three junction gallium arsenide battery,
providing "extraterrestrial environment" simulation for the development of aerospace photovoltaic devices.
Millisecond level production line gatekeeper
In the 7-IV3000 fully automatic component IV tester, 7-SCT2 serves as the temperature control core module, dynamically compensating for environmental temperature fluctuations with a response speed of 0.1 seconds,
compressing the PERC component power calibration deviation from ± 0.8W to ± 0.15W, helping a leading enterprise's production line yield increase from 98.2% to 99.9%, and reducing annual production capacity losses
by over 5 million yuan per line.
Ultra low temperature extreme challenger
For ultra-low temperature scenarios such as aerospace photovoltaics and deep space exploration, the 7-SCT2 can be equipped with a liquid nitrogen circulation cooling module to achieve ± 0.1 ℃ accuracy in a wide
temperature range of -40 ℃ to+120 ℃. It has been successfully applied to ground simulation testing of a deep space detector battery, verifying the electrical stability of the battery in a -180 ℃ liquid nitrogen environment.
3、 Precision reconstruction: 0.001mm level mechanical error "zeroing" plan
In photovoltaic testing, probe pressure fluctuations and micro scale offset of the battery can both become "error amplifiers". 7-SCT2 is designed with three major precision measures to reduce the impact of mechanical
interference on testing to the atomic level:
Nano positioning laser navigation system
By using a dual frequency laser interferometer and a piezoelectric ceramic micro displacement stage, the X/Y/Z three-axis positioning accuracy of 0.001mm level is achieved. Combined with AI vision alignment algorithm,
the deviation between the battery and the center of the light spot is less than 5 μ m, eliminating Isc measurement errors caused by optical path differences. In the testing of 50mm × 50mm large-sized perovskite cells, the
system increased the spot utilization rate from 85% to 99.5%.
Molecular level contact force control
Equipped with a high-precision force sensor and closed-loop feedback system, the probe maintains a constant contact force of 30 ± 0.5g (adjustable). The probe material is single crystal diamond coated with ruthenium
(hardness HV2200), and the contact resistance is less than 0.1m Ω, avoiding contact resistance drift caused by probe wear or pressure fluctuations. A laboratory test showed that this design improved the repeatability of
Rsh measurement for flexible organic batteries from ± 30% to ± 1.2%.
Global thermal shielding nano coating
Spray yttria stabilized zirconia (YSZ) nano thermal barrier coating (emissivity<0.03) on the edge of the table, combined with an active air cooling system, to achieve a temperature difference of<0.02 ℃ between the edge
and the center of the table, meeting the testing requirements of temperature gradient sensitive devices such as quantum dot batteries and nanocrystalline batteries.
4、 Ecological Evolution: SOFN Instruments' 'Temperature Controlled Metaverse'
As a "rule maker" in the field of photovoltaic testing, SOFN Instruments has built a comprehensive ecosystem of temperature control technology:
Atomic level traceability system
Each 7-SCT2 temperature control table is equipped with a laser interferometer calibration certificate and NIST standard traceability report, supporting mutual recognition with more than 20 metrology institutions worldwide,
and providing a "temperature passport" for the export of photovoltaic products to the EU CE and US UL certifications.
Customized services at the cellular level
For cutting-edge fields such as micro nano photovoltaics and biophotovoltaics, we can provide ultra precision components such as microfluidic temperature control modules (temperature gradient of 0.001 ℃/mm) and transparent
conductive glass adaptation fixtures. The entire process from requirement disassembly to prototype delivery can be completed within 14 days.
Quantum state data symbiosis
The accompanying 7-SFM Pro testing software supports deep linkage with the temperature control table, automatically generating temperature compensation IV curve families that comply with the IEC 61853-2 standard, and can be
integrated with digital twin systems to achieve virtual simulation prediction of battery performance degradation, allowing the "lifecycle" data of each battery to be traced back to atomic level thermodynamic parameters.
Conclusion: Measuring the Future of Photovoltaics with 'Absolute Zero'
At the critical point of photovoltaic technology transitioning from the "Watt Revolution" to "atomic precision", the SOFN Instruments 7-SCT2 solar cell IV test temperature control bench is becoming the "meta rule" for reconstructing
the underlying logic of the industry. It uses a maximum temperature control accuracy of ± 0.05 ℃, making each set of IV data a "truth slice" directly pointing to the intrinsic properties of the material; Using 0.001mm nanoscale positioning,
the quantum level interference caused by mechanical errors on the test was eliminated; The zero contact design of "vacuum+magnetic levitation" makes it possible to test cutting-edge devices such as flexible photovoltaics and quantum dot batteries.
Choosing SOFN Instruments 7-SCT2 means choosing to go hand in hand with "nanoscale temperature control", making the calibration of each watt of photovoltaic power a "quantum scale" that defines future energy standards.
SOFN Instruments - Defining the Future with Light as a Ruler
Official website: http://www.7-s.com.cn |Hotline: 010-80885970
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