In the process of photovoltaic technology moving towards the critical point of 30% conversion efficiency, temperature has become a "hidden gap" between laboratory data and industrial applications - every 1 ℃ fluctuation may cause the open circuit voltage (Voc) of photovoltaic cells to decay by 2mV, the fill factor (FF) to drift by 0.5%, and ultimately lead to distorted efficiency test results. The Saifan Optoelectronics 7-SCT1 solar cell IV testing temperature control table has built a "temperature vacuum chamber" for photovoltaic research and quality inspection with a temperature control accuracy of ± 0.1 ℃ and millisecond response speed, allowing IV testing to eliminate environmental interference and directly reach the core of material intrinsic performance.
1、 Temperature tamer: triple technological revolution behind ± 0.1 ℃
In photovoltaic IV testing, temperature is not only a variable, but also a "magnifying glass" - it can expose material defects and mask process advantages. The 7-SCT1 temperature control table uses three core technologies to compress the impact of temperature fluctuations on battery performance to the limit:
Semiconductor refrigeration "dual core engine": using Peltier semiconductor modules combined with high thermal conductivity ceramic substrates to achieve stepless regulation over a wide temperature range of 5-40 ℃. Combined with PID closed-loop algorithm, the table temperature fluctuation is less than ± 0.1 ℃ (10 times better than IEC 60904-9 standard). In the development of a TOPCon battery, the temperature control table compressed the temperature coefficient measurement error of Voc from ± 0.5mV/℃ to ± 0.08mV/℃, helping customers reduce battery efficiency calibration deviation by 67%.
Vacuum adsorption "zero thermal resistance" design: For thermal sensitive devices such as perovskite cells and flexible photovoltaics, 7-SCT1 can be equipped with vacuum adsorption function. Through a 10 ⁻ Pa level vacuum environment, the air thermal resistance between the battery and the table is eliminated, resulting in a deviation of less than 0.2 ℃ between the surface temperature of the battery and the table temperature. In a flexible CIGS battery test, this design eliminated the contact thermal resistance error caused by battery bending deformation from ± 1.2 ℃ to 0, and increased the repeatability of short-circuit current (Isc) to ± 0.15%.
High conductivity copper "thermoelectric isolation" table: using a 160mm × 180mm large-area copper base (thickness 15mm), surface gold-plated treatment, resistivity<1.72 μ Ω· cm, can be used as a back electrode while carrying the battery, eliminating the interference of lead resistance and contact thermal resistance on testing. A comparative test in a certain laboratory showed that the table reduced the measurement error of the series resistance (Rs) of HJT batteries from ± 0.3m Ω to ± 0.05m Ω, making the true value of the fill factor (FF) more explicit.
2、 Scene Breakthrough: "Full Chain Temperature Control" from Laboratory to Production Line
The 7-SCT1 temperature control table adopts modular design to achieve "one machine, multiple uses", covering the full cycle testing scenarios of the photovoltaic industry chain:
R&D end: In the 7-SCSpecV spectral performance testing system, 7-SCT1 and Saifan Optoelectronics' 7-SSC standard solar cell form a "golden partner". The dark current noise of spectral response (SR) testing is suppressed to fA level through ± 0.1 ℃ temperature control, which improves the accuracy of current matching analysis for each sub cell of perovskite/crystalline silicon stacked cells by three times.
Production end: In the 7-IV200S component IV tester, 7-SCT1 serves as the temperature control core module, and its ± 0.1 ℃ temperature control accuracy can control the power calibration deviation of PERC cells within ± 0.3W, helping to increase the production line yield from 98.5% to 99.7%. After adopting this solution, a certain leading component enterprise reduced the annual production capacity loss of a single line by more than 2 million yuan.
Academic end: A team from the Chinese Academy of Sciences conducted stability research on perovskite cells, relying on 7-SCT1 and Saifan Optoelectronics' 7-SS9003A large-scale steady-state simulator, and achieved a surface temperature fluctuation of<± 0.2 ℃ under continuous 1000 hours of light irradiation. The related results were published in Advanced Energy Materials.
3、 Precision Revolution: 0.01mm level positioning and "probe as standard"
In photovoltaic testing, small variables such as probe pressure and battery offset may become "error amplifiers". The 7-SCT1 temperature control table is designed with three major precision measures to reduce the impact of mechanical errors on testing to the nanometer level:
Zero error positioning mechanism: using cross roller guide rails and differential head drive, achieving X/Y/Z three-axis positioning accuracy of 0.01mm level. Combined with laser alignment system, it ensures that the height difference between the tested battery and the standard battery at the simulator's light outlet is less than 0.05mm, eliminating Isc deviation caused by optical path difference.
Probe as standard "design: The table sink is equipped with a detachable test probe made of gold-plated beryllium copper (resistivity<2.2 μ Ω· cm), with a constant contact pressure of 50 ± 2g, to avoid changes in contact resistance caused by probe wear or pressure fluctuations. A laboratory test showed that this design improved the repeatability of parallel resistance (Rsh) measurement of heterojunction batteries from ± 15% to ± 2%.
Full coverage of "thermal insulation film": 0.5mm thick polyimide thermal insulation film is embedded at the edge of the table to block the influence of thermal radiation from the table edge on the edge of the battery, so that the temperature gradient within the 50mm × 50mm light spot range is less than 0.05 ℃/cm, meeting the testing requirements of devices with strict temperature uniformity requirements such as triple junction gallium arsenide (GaAs) batteries.
4、 Ecological Empowerment: Saifan Optoelectronics' "Full Chain Temperature Control Philosophy"
As the "hidden champion" in the field of photovoltaic testing, Saifan Optoelectronics not only provides hardware, but also builds a temperature control service system covering the entire lifecycle:
Standard traceability system: Each 7-SCT1 temperature control table comes with a temperature control accuracy certification issued by the Chinese Academy of Metrology, supporting mutual recognition with international standards such as NIST and PTB, clearing certification barriers for photovoltaic products exported to markets such as the European Union and the United States.
Rapid customization service: For special needs such as flexible photovoltaics and aerospace grade batteries, we can provide ultra-low temperature (-40 ℃) and ultra-high temperature (150 ℃) expansion modules, as well as non planar battery adaptation fixtures. The entire process from requirement confirmation to sample delivery can be completed within 72 hours.
Data coexistence system: The supporting 7-SFM photovoltaic testing software supports seamless integration with the temperature control table, automatically generates temperature compensation test reports that comply with the IEC 61853 standard, and can be integrated with the MES system to achieve direct data collection on the production line, so that the IV test data of each battery can be traced back to the temperature control parameters.
Conclusion: Calibrating the Future of Photovoltaics with "Temperature Weights"
At the critical point where photovoltaic technology is transitioning from a "laboratory singularity" to an "industrial explosion", the Saifan Optoelectronics 7-SCT1 solar cell IV testing temperature control table is becoming a pivot to drive the industry's qualitative change. It measures the boundary of the intrinsic properties of materials with a temperature control accuracy of ± 0.1 ℃; Using a positioning accuracy of 0.01mm to eliminate the interference of mechanical errors on the test; The design philosophy of "probes as standards" is reshaping the underlying logic of photovoltaic testing.
Choosing Saifan Optoelectronics 7-SCT1 means choosing to go hand in hand with "precise temperature control", making the calibration of every watt of photovoltaic power the cornerstone of driving the energy revolution.
Saifan Optoelectronics - Defining the Future with Light as a Ruler
Official website: http://www.7-s.com.cn |Hotline: 010-80885970
Link Microblog
