PERC solar cell light-injection induced regeneration process and equipment

Abstract

The invention discloses PERC solar cell light-injection induced regeneration equipment, which comprises a first region, a second region, a third region and a fourth region, wherein the first region, the second region and the third region respectively comprise an LED lamp group and a hot air outlet; and the fourth region comprises a hot air outlet and a cooling water plate. The LED lamp group in each region is controlled independently; light intensity is not less than 18 suns at least when the power of the LED lamp group in each region is 100%; the power of the LED lamp group in the first region is smaller than the power of the LED lamp groups in the second region and in the third region; and the temperature of the first region is higher than that of the second region and the third region.Correspondingly, the invention also discloses a PERC solar cell light-injection induced regeneration process. The PERC solar cell light-injection induced regeneration process and equipment can effectively passivate the boron oxygen defect state in a solar cell and make the cell piece reach a new stable state, thereby making CID reduce by 0.1%-0.8% under the condition where efficiency reduction isless than 0.05%.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a photoregeneration process and equipment for PERC solar cells. Background technique [0002] Current Injection Degradation (CID) refers to the power attenuation phenomenon caused by the process of carrier injection of solar cells and components. Such carrier-induced degradation specifically limits the performance of PERC cells, as PERC cells are now market-dominating, and thus CID is gaining more and more attention in the photovoltaic circle. At present, the standards and monitoring of CID have not yet been formulated and implemented in the industry; the academic circles have not yet reached a consensus on the reasons for CID. Stuart of South Wales proposed that after high-temperature sintering, the interstitial hydrogen atoms (B1) cooled rapidly and combined with B to form H-B (B2). 2. The theory of metal dissolution and dispersion. Metal precipitation disperses to form interstitia...

AI Technical Summary

Problems solved by technology

3. The theory of boron-oxygen defect states, boron-oxygen defects are very easy to capture minority carriers and cause attenuation

[0004] Prior art, such as CN104538500B "A PECVD coating and sintering process for anti-LID and PID of crystalline silicon solar cells", which discloses the use of LID with a furnace temperature of 200°C and a light intensity of 2.5suns in the examples. Regenerative repair process, and its belt speed is 6.0m / min. In the case of low temperature and light intensity, the rate of H passivation is slow, and the partial passivation of defects in the body leads to low battery efficiency.

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