Adjust the etching tank formula, and reduce the self-replenishment from 27.2L/10,000 pieces to 24L/10,000 pieces, a reduction ratio of 11.6%

Reduce the HF consumption of pickling after etching, and the self-replenishment is reduced from 8.4L/10,000 pieces to 4.0L/10,000 pieces, a reduction ratio of 52.3%

The HF consumption for cleaning after texturing was reduced from 8.8L/10,000 pieces to 7L/10,000 pieces, a reduction ratio of 25.7%. The formula was adjusted on 6/29.

The pickling and consumption reduction after etching has been completed before. In order to control the proportion of black spots and restore, it is expected to restart on Sunday. The total HF consumption reduction is expected to be about 20%. Since the production line is increasing production and opening up, in order to improve the cleaning effect, the newly opened line has not yet reduced consumption.

Adjust the etching tank recipe

With the introduction of Feilu pre-cleaning additives, the self-replenishment volume is expected to be reduced from 53L/10,000 pieces to 25L/10,000 pieces, a reduction of 53%. Sanfeng cleaning agent has been used in batches on 6/28 and has been reduced to 20L/10,000 pieces.

Topband cleaning agent has completed three lines. As the business and technology center prepares to introduce a second supplier, the line expansion plan is suspended. The consumption of imported lines has been reduced by 40%, and the current unit consumption is 33L/10,000 pieces.

The overflow method of texturing was changed from constant overflow to basket overflow, and the overflow volume was adjusted at the same time. The unit consumption was reduced from 17 tons/10,000 pieces to 11 tons/10,000 pieces. Changes across the board this Friday

Yarn thickness reduced from 60 to 56

Film thickness reduced from 10 to 8

The sample test has passed, the test screen paste weight is 25mg, and the batch screen has been purchased.

Back field film thickness reduced from 20 to 16

Backfield line width reduced from 120 to 105

The sample test slurry weighs 200mg, and 5 medium batch screen plates have been purchased and will arrive on July 13 for batch use.

Knotless screen printing was introduced, and the simultaneous film thickness was reduced from 10 to 7

Adjust the ratio of SiH4 and NH3 in the front and back films. The current theoretical consumption of silane is 0.73kg/10,000 pieces and ammonia is 3.10kg/10,000 pieces. After the reduction, the consumption is 0.66kg/10,000 pieces and 2.9kg/10,000 pieces, respectively, a reduction of 11%.

For machines whose RF power has not reached the maximum, adjust the RF power to the maximum to reduce ventilation time and special air consumption.

Batch switching has been completed. Recently, due to the production line opening, there are many saturated boats, resulting in high special gas consumption.

Design gradient experiments to reduce N2O flow in the back film process of the ALD route

Develop a new back film process, adjust the film thickness and structure of silicon oxynitride and silicon oxide, and reduce N2O experiments in the CT two-in-one route

Try to develop new processes, cancel the SiNxOy and SiOx film layers of the ALD route, and stop using laughing gas

After comprehensive evaluation, the efficiency loss is unacceptable and will not be reduced.

Adjust the large nitrogen flow rate of the diffusion process to reduce the diffusion nitrogen consumption (the coating vacuum pump has been adjusted twice, and if the flow rate is reduced, the vacuum pump will frequently get stuck)

The graphite boat cleaning agent bubbling is changed to air pressure. Nitrogen usage was reduced to 5%.

The nitrogen consumption reduction target is 293kg/10,000 pieces.

Adjust the pressure air flow of the sintering furnace and synchronize the sintering curve to ensure efficiency and yield, reduce pressure air consumption, and thereby reduce energy consumption.

Good product

famous road

Lebon

Hengsheng

Among the four screen manufacturers, taking into account lifespan, unit consumption and efficiency, Liangpin, Minglu and Lebang can be qualified suppliers. Lebang is an alternative supplier due to its higher price.

12 film thickness

11 film thickness

10 film thickness

8 film thickness

The film thickness is thicker. When it is 12 microns, the unit loss is high and the grid is seriously broken. The film thickness is reduced to 8. The wet weight is too low and the tension and reliability are not controlled. After comprehensive consideration, the film thickness is controlled at 10 microns. More consistent with the production line

25 line width

23 line width

21 line width

20 line width

18 line width

When the line width is wider, the printability is significantly improved, but the efficiency loss is greater and the wet weight is higher. When the line width is reduced to 18 microns, a large number of broken gates appear, and there is no advantage in efficiency. The final line width is determined at 20 microns.

oxygen flow gradient

anterior homologous gradient

Temperature gradient

Post-oxidation time and temperature gradient

Through combined experiments, it was determined to reduce the oxygen flow, fine-tune the front source, and make a high surface concentration shallow junction process, that is, the 0411 process

Diffusion resistance gradient experiment

SE square resistance reduction experiment

Rich hydrofluoric acid system

Rich nitric acid system

The tracking results show that the hydrofluoric acid-rich system process has greater advantages, and the efficiency is 0.07 higher than the production line, rising from 22.60% to 22.68% (JA Solar products) with no abnormal appearance. The nitric acid-rich system process has poor process stability, and the appearance is difficult to satisfy customers. Require

During the process of debugging the formula, we experimented with a process with a backside reflectivity of up to 44%. Due to the large weight loss, it has a greater impact on the debris and rework yield, and is used as a process reserve.