On the journey towards the critical point of 30% efficiency in the photovoltaic industry, the small fluctuations in each IV curve and the calibration deviation of each watt of power may become stumbling blocks for technological iteration. The Saifan Optoelectronics 7-SSC monocrystalline silicon standard solar cell, with a miniature body of 20mm × 20mm, carries the "gold standard" in the field of photovoltaic testing - it is not only the "calibration anchor" for laboratory data, but also the invisible driving force for the "qualitative change" of the photovoltaic industry from laboratory to industrialization.
1、 Stable as a Rock: Fully Sealed Vacuum Encapsulation Builds a 'Time Shield'
The accuracy of photovoltaic testing begins with the stability of standard cells. The 7-SSC series adopts triple technical barriers to minimize the impact of environmental interference on battery performance:
Vacuum packaging black technology: After strict aging screening, the battery cells are embedded in a square aluminum base using fully sealed vacuum packaging technology, completely isolating water vapor, oxygen, and mechanical stress erosion. The packaging window adopts a double-layer protection of anti irradiation glass and photosensitive adhesive, with a light transmittance of over 92% and a refractive index perfectly matched with silicon-based materials, ensuring that photon transmission loss is less than 0.5%.
Temperature tamer: Built in Pt100 platinum resistance temperature sensor, pre packaged and calibrated according to NIST standards for real-time monitoring of battery surface temperature. Combining the four terminal Kelvin connection design, the interference of lead resistance and thermoelectric potential on short-circuit current measurement is completely eliminated, and the influence of temperature fluctuations on photocurrent is less than 0.01%/℃.
Anti decay gene: After accelerated aging testing by a third-party authoritative organization (85 ℃/85% RH/1000h), the battery efficiency decay rate is less than 0.1%, far exceeding the IEC 60904-2 standard and becoming the "rust proof weight" of photovoltaic laboratories.
2、 Millimeter Competition: Spectral Response Accuracy Reaches' Atomic Level '
In quantum efficiency (QE) and monochromatic photon electron conversion efficiency (IPCE) testing, the 7-SSC series redefines industry standards with "nanometer level" spectral response accuracy:
Spectral response bandwidth: covering the 300-1100nm band, with a repeatability of less than ± 0.3% in the core range of 400-900nm, perfectly matching the spectral testing requirements of new devices such as perovskite/crystalline silicon stacked batteries and quantum dot batteries.
Nonlinear error resolution: By suppressing stray light in the spectroscopic system (<1 × 10 ⁻⁵) and using four quadrant lock-in amplification technology, dark current noise is suppressed to fA level, and μ A level photo generated current can still be captured under 0.1 solar intensity, providing a reliable short-circuit current (Isc) reference for low open circuit voltage devices such as HJT cells and TOPCon cells.
Spatial Uniformity Revolution: Laser confocal microscopy is used to detect the distribution of grid lines on the surface of the battery, ensuring that the grid width error is less than ± 2 μ m, the series resistance (Rs) fluctuation is less than 0.1m Ω· cm ², and the fill factor (FF) testing error is compressed to within ± 0.2%.
3、 Scene Breakthrough: "Versatile Adaptation" from Laboratory to Production Line
The 7-SSC series achieves "one core, multiple uses" through modular design, covering the full cycle testing scenarios of the photovoltaic industry chain
R&D end: In the 7-SCSpecIII multi junction battery spectral performance testing system, the 7-SSC10A-IPCE model can synchronously output EQE/IQE hyperbolas, combined with Saifan Optoelectronics' patented polarizing filter group, to achieve precise disassembly of the current matching degree of each sub cell of the triple junction battery, accelerating the efficiency breakthrough of the new stacked battery.
Production end: In the 7-IV200S solar cell IV tester, the 7-SSC10B model is used as a reference cell, and its irradiance linearity error is less than ± 0.3%. It can control the component power calibration deviation within ± 0.5W, helping to improve the yield of PERC cell and N-type cell production lines to over 99.2%.
Academic end: A team from the Chinese Academy of Sciences conducted research on the stability of perovskite cells, relying on the 7-SSC series cells and Saifan Optoelectronics' 7-SS9003A large-scale steady-state simulator, and achieved an Isc attenuation rate of less than 1.5% under continuous 1000 hours of light irradiation. The related results were published in Nature Energy.
4、 Ecological Empowerment: Saifan Optoelectronics' "Full Chain Service Philosophy"
As the "hidden champion" in the field of photovoltaic testing, Saifan Optoelectronics not only provides hardware, but also builds a service system covering the entire lifecycle:
Certification escort: Each 7-SSC battery comes with a traceability certificate issued by the China Institute 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: For special needs such as heterojunction cells and flexible photovoltaics, we can provide customized gate line design, anti bending packaging and other services. The entire process from requirement confirmation to sample delivery can be completed within 72 hours.
Data symbiosis: The supporting 7-SFM photovoltaic testing software supports seamless integration with the entire range of equipment from Saifan Optoelectronics, automatically generating test reports that comply with the IEC 61853 standard, and can be integrated with MES systems to achieve direct data collection on the production line.
Conclusion: Measuring the Future of Energy with the Weight of Light
At the critical point where photovoltaic technology is transitioning from a "laboratory singularity" to an "industrial explosion", the Saifan Optoelectronics 7-SSC monocrystalline silicon standard solar cell is becoming a pivot to drive the industry's qualitative change. It carries the ultimate pursuit of photovoltaic testing between 20mm x 20mm square inches; Measuring every step towards carbon neutrality with an accuracy error of less than ± 0.3%.
Choosing Saifan Optoelectronics 7-SSC is choosing to go hand in hand with "precision", making the calibration of every watt of photovoltaic power the cornerstone of promoting the energy revolution.
Saifan Optoelectronics - Defining the Future with Light as a Ruler
Official website: http://www.7-s.com.cn |Hotline: 010-80885970
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