On December 28, Dongfang Risheng disclosed the record of investor relations activities, which showed that the company's special business sector of p-type ultra-thin heterojunction showed a high growth tendency, but at this stage it accounted for a very small proportion of the company's revenue.
At present, through its own technology accumulation, the company is promoting the technical cooperation of perovskite/crystalline silicon heterojunction tandem batteries with leading perovskite enterprises, and jointly laying out the next generation of high-efficiency battery technology routes.
The full text is as follows:
1. Technical background
The earliest satellites used p-type crystalline silicon photovoltaic cells as the core energy supply system, but the early conversion efficiency was less than 10%. Therefore, the mainstream aerospace applications have gradually turned to GaAs photovoltaic cells with high efficiency and high cost, and their conversion efficiency has reached more than 30%. Driven by the wave of new energy power generation transformation, the technology of crystalline silicon photovoltaic cells has been continuously improved, the conversion efficiency has been continuously improved, and the production cost has been significantly reduced, while the cost performance of gallium arsenide cells is relatively limited due to factors such as complex technology, limited capacity and process bottlenecks.
In recent years, rocket recoverable technology has transformed the rocket from a single consumable into a reusable one; meanwhile, the lightweight and modularization of satellite design have enabled a single launch to carry multiple satellites, diluting the launch cost of each satellite. The reduction of launch cost and satellite manufacturing cost will enhance the feasibility of "space infrastructure" such as constellation and space data center. Satellites have entered the stage of intensive networking and large-scale development. Facing the huge market demand and cost pressure, solar wing, as the energy center of satellites, needs to keep up with the pace of cost reduction and efficiency enhancement of the whole industry. Therefore, crystalline silicon photovoltaic cells, with their continuous optimization of comprehensive performance, are re-entering the field of aerospace applications.
The company's p-type ultra-thin heterojunction (HJT) series products have comprehensive comparative advantages in ultra-thin silicon wafer application, production cost, specific power, roll solar wing (flexible solar wing) adaptation, radiation resistance and so on. The company has the ability to deliver p-type ultra-thin HJT products in batches according to customer needs, and this series of products have small batch delivery experience in overseas areas.
2. Why choose p-type batteries instead of n-type batteries?
Under the radiation of high-energy particles, silicon materials will produce defects, which will form recombination centers and reduce the minority carrier lifetime. However, these defects have a weak ability to trap electrons in p-type silicon, so they have little effect on the minority carrier lifetime. Doping elements in n-type silicon will form more deep level defects after irradiation, and these defects have stronger ability to capture holes, resulting in a significant decrease in minority carrier lifetime. The former is less sensitive to the effect of radiation on crystalline silicon, and its radiation resistance is better than that of n-type solar cells.
3. Why is the p-type ultra-thin HJT more suitable for the space
comparison PERC structure battery than p-type PERC? The company's heterojunction structure battery has a symmetrical structure with full passivation on both sides, and adopts a low-temperature process, which has obvious advantages in the compatibility of thin sheets. The current mainstream PERC battery is about 130 μm thick, and the p-type ultra-thin HJT battery delivered by the company is about 50-70 μm thick, and still has the potential for further thinning.
In the application scenarios such as LEO satellites, which are sensitive to cost and have a short life, the thin battery can effectively reduce the launch load and save fuel. At the same time, the ultra-thin design gives the battery good flexibility, so that it can adapt to the rolling solar wing structure (flexible solar wing), and improve the internal space utilization of the satellite. In addition, thinner cells also help to reduce performance degradation caused by radiation, thus improving the overall efficiency and economy of on-orbit operation of batteries.
4. Shipping and customers
of p-type ultra-thin heterojunction Up to now, the company has been shipping for three years, and the cumulative shipment has reached tens of thousands of pieces. Customers are distributed in Europe and America.
5. How about
the production capacity of p-type ultra-thin heterojunction? The historical products are produced by using the company's pilot production line during the interval of research and development tasks. The production capacity of the pilot production line will be expanded or the mass production line will be adapted according to the order quantity and price.
6. Technology evolution It is expected
that the special products delivered in batches by the Company will adopt crystalline silicon heterojunction technology. While continuing to consolidate the advantages of heterojunction technology, the company has actively developed the R & D reserve of laminated battery technology, which has been certified by the National Solar Photovoltaic Product Quality Inspection and Testing Center. The perovskite/crystalline silicon heterojunction tandem solar cell developed by the company's Global Photovoltaic Research Institute has achieved a conversion efficiency of 30.99%.
At present, through its own technology accumulation, the company is promoting the technical cooperation of perovskite/crystalline silicon heterojunction tandem batteries with leading perovskite enterprises, and jointly laying out the next generation of high-efficiency battery technology routes.
7. Summary
The special business segment of p-type ultra-thin heterojunction of the Company shows a high growth tendency and has a large market capacity potential, but it accounts for a very small proportion of the Company's revenue at the present stage. It is suggested that investors carefully evaluate investment decisions based on the disclosed performance and potential risks of the Company.
浙公网安备33010802003254号