Researchers in China have investigated four strategies that minimize the recombination centers of the topcon’s topcon and improve the performance of light of light. They identified alkali polishes with micro-texturing as the most suitable technology to improve the open-circuit voltage and the filling factor and overall device performance.
A research team of Chinese Yangzhou University has investigated how four back -treatment techniques can improve passivating performance, contact and electrical performance in Topcon sun cells and has discovered that all treatments have beneficial effects.
“Our work quantitatively clarifies how Micro/Nano-Rekmorfology techniques such as such as such as Zuuretsen (E), zuuretsen met micro-textuur (EM), alkali-polijsten (P) en alkali-polijsten met micro-textuur (PM) kunnen co-moduleren tunnel-oxide-uniformiteit, contactbestendigheid en carrierrecombinatie, die een directe richtlijn biedt voor N-Topcon achterste ontwerp, de onderzoeksonderzoek, Qinqin, Qinqin, Qinqin, Qinqin, Qinqin, Qinqin, Qinqin Wang, told. PV -Magazine.
The four strategies are intended to minimize the surface combination centers of the cell and to improve the performance of the light of light.
The scientists noted that the rear murmur also has an impact on the top concel production process, because it requires adjustments to the tunneling oxide thickness, polysilicium thickness and p-atom doping concentration.
They carried out a series of experiments on topcon cells based on czochralski (CZ) waffles with a size of 182 mm x 182 mm, which underwent conventional alkaline texturing and were treated with drill (b) diffusion. These were then divided into different treatment groups for acid sets or alkali polishes. The passivating layer pile based on aluminum oxide (Alox) and Silicon monoxide (SIOX)) was deposited via plasma improvement Chemical deposit ((PECVD).
“The surface emorfology and 3D morphology of the back of the waffles were observed using a scanning electron microscope (SEM, JSM-6510) and an Olympus electron microscope (DSXHRSU),” the scientists explained. “Napson (RG-2000PV) and WEP-Wafer profile (CVP21) were used to evaluate the plate resistance from the back of the waffles and determine the doping profiles.”
The analysis showed that EM treatment is able to increase the cell filling factor in comparison with the simple E-treatment, but reduces the open circuit voltage, resulting in a cell efficiency of 24.57%. The P2 technique turned out to increase both the filling factor and the open circuit voltage and to increase cell efficiency by 0.18% compared to a device that underwent the E-treatment, with the efficiency of the device 24.73%.
Furthermore, the analysis showed that the topcon cell with the highest efficiency of 24.78% that was treated with PM, which pushed the filling factor to 84.24% while retaining high open circuit voltage levels.
“The raw surface of the PM treatment ensures that longer wavelengths of light penetrate the heavily doped poly-si, which improves the absorption of the free wearer and improves light consumption,” the scientists emphasized. “This treatment shows significant benefits when improving the open circuit voltage and short-circuit current of solar cells. In the meantime, the rear micro-texture morphology is considerably reducing the contact resistance of the back, which is conducive to improving the filling factor.”
Their findings can be found in the study “Research into electrical properties and mechanism of N-Topcon sun cells with different rear surfaces“Published in Solar energy. The research group consisted of academics of Chinese Changzhou University.
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