We aim to improve cell efficiency by developing optimal rear surface morphology for industrial tunnel oxide passivated contact (TOPCon) solar cells. Using a new chemical additive in the rear side polishing process, the pyramid base size can be increased from 2 to 10 μm to achieve a relatively flat surface for passivation improvement. As a result, the wafer minority carrier lifetime under new chemical additive condition measured at 5E15 cm−3 injection density by the Sinton WCT-120 tool was increased from 1865 to 3043 μs, and the implied open circuit voltage (iVoc) was also improved from 731.6 to 748.0 mV by comparing with the baseline of standard cell production (G1). The better passivation is due to the decreased surface recombination rate and more uniform passivation layer. However, the contact resistance was increased from 1.01 to 1.11 mΩ·cm2, which will result in a lower fill factor of TOPCon solar cells. To solve this contact problem, one more texture process was used to generate many small pyramids (1 μm size) on the larger pyramid bases. The contact resistance was successfully decreased from 1.11 to 0.87 mΩ·cm2. To check the final cell performance, TOPCon solar cells with different rear surface morphologies were also fabricated in the industrial mass production line. By comparing with the baseline of G1, our technology can increase the cell efficiency by 0.24% absolutely, and this technology can be applied to cell production directly.
KEYWORDS: Signal intensity, Resistance, Laser energy, Data transmission, Wireless energy transfer, Optical simulations, Laser applications, Energy transfer, Electrons, Solar radiation models
Laser wireless energy information synchronization transmission technology can transmit signals while transmitting energy, reducing the system's reliance on communication devices. It effectively reduces system weight while increasing energy utilization, making it valuable for long-distance wireless energy transfer systems with low signal rate requirements. In this paper, a finite element simulation model for laser power converter is established. Using this model, the impact of signal energy intensity and load resistance on signal transmission under low-speed signal transmission conditions is studied. The research indicate that under the same signal energy conditions, the signal intensity increases and then decreases with the increase in load resistance, and the optimal signal load resistance occurs earlier than the optimal power transmission load resistance. Additionally, as the signal energy increases, the difference between the signal load resistance and the power transmission load resistance also increases. The mismatch between the maximum signal load resistance and the optimal power transmission load resistance inevitably involves a trade-off between energy and signal. Based on this, the paper discusses the selection method of load resistance in the energy-carrying communication process and calculates the loss of signal intensity and transmission energy under different load resistances. The conclusions of this research provide reference for the field of laser energy-carrying communication.
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