변환 효율을 향상시키세요! PERC 셀 레이저 그루빙용 RFH 나노초 고체 레이저

태양 에너지를 효율적으로 사용하는 방법은 현재 시장 조사의 초점입니다. 기존의 100% 알루미늄 백필드 태양전지는 현재 태양전지의 대량 생산을 위한 매우 성숙한 공정이지만, 높은 후면 재결합률은 변환 효율 향상에 한계가 있습니다. 따라서 후면 재결합률을 줄이는 것이 점차 태양 전지의 변환 효율을 향상시키는 효과적인 방법이 되었습니다. 방법 중 하나.

PERC 태양 전지는 높은 변환 효율과 낮은 비용으로 인해 태양 전지에 대한 차세대 기존 기술이 되고 있으며 시장에서 새로운 인기를 얻고 있습니다.

자외선 레이저  | 녹색 레이저  | 자외선 레이저  | 자외선 dpss 레이저  | 나노초 레이저  | UV 레이저 소스  | 고체 레이저

PERC technology, that is, passivated emitter and back cell technology, compared with ordinary cells, adds back passivation, laser grooving and other processes to enhance the reflection of the inner plate and reduce the optical loss of long wavelengths. At the same time, the open circuit voltage of PERC cells Compared with conventional batteries, the short-circuit current and short-circuit current are greatly improved, and the conversion efficiency is effectively improved. The technical implementation is mainly that a backside passivation layer film is first deposited, and then grooves or holes are made on the passivation stack of the PERC cell to open a path for the contact between the silicon substrate and the metal aluminum. This process is mainly completed by laser. . After the laser grooving exposes the silicon substrate, since there is no film barrier in the laser grooving area, the aluminum back field is in contact with the silicon substrate through the holes or grooves in the film. Resistors are connected in series, and the current can be smoothly derived.

The industrial-grade nanosecond solid-state laser produced by RFH can be applied to the back-grooving process of PERC cells through an industrial integrated optical system. After selecting appropriate process parameters, the output 532nm laser is irradiated to the object through a high-speed scanning galvanometer and a condenser lens. On the surface, conduction band electrons are generated by thermal excitation or photoexcitation. The conduction band electrons absorb energy through avalanche ionization and Joule heating to form plasma. The plasma transfers energy to the material through electron-phonon coupling, so that the heated material is melted and sublimated. , and then ablate or break through a portion of the silicon nitride layer in selected areas on the back surface, a process known as a laser grooving process.

The researchers found that the smaller the area of ​​the laser grooving area, the smaller the damage to the passivation layer, the higher the minority carrier lifetime, and the higher the open circuit current. Therefore, the laser grooving pattern can also be set. The combination of (point), line segment and long straight line can retain more area of ​​the passivation film and reduce the damage to the passivation layer. RFH industrial grade nanosecond solid-state laser has excellent beam quality (M2 < 1.2), after focusing, the spot diameter is small, the slotting area is finer, and the flexibility is high, and it can be performed 7*24 hours. Laser slotting pattern circuit is easier , fast speed, while improving the quality of grooving, improve the efficiency of work.

Since there is still a lot of room for efficiency improvement in PERC cells, which means its broad application market, RFH will continue to precipitate technology to improve the efficiency of PERC cells and even the efficiency of the entire solar cell industry and photovoltaic industry. ” and “carbon neutrality” contribute wisdom and strength.