- Industry News2025-08-21
- Application of Slot-Die Coating Technology in Perovskite Solar Cell Production
As an emerging photovoltaic technology, perovskite solar cells are rapidly becoming a research hotspot and a new direction for industrialization in the photovoltaic field due to their high efficiency, low cost, and material diversity. During the preparation of perovskite films, slit-slot coating technology has become one of the key processes in perovskite solar cell production due to its efficient and uniform coating effect.
Advantages of slit coating technology
Slot coating technology is a coating technique that pushes the solution through mold gaps under a certain pressure and transfers it onto the substrate. By precisely controlling parameters such as coating speed, thickness, temperature, and humidity, slot coating technology can achieve high-precision and uniform coating results. Its main advantages include:
1. High precision and efficiency: Slit coating technology enables precise design through control system parameter settings, enabling precise control of film thickness.
2. High raw material utilization: Compared to dry processes, wet processes (including slit coating) offer advantages such as higher raw material utilization and lower costs.
3. Compatible roll-to-roll production: Slit coating technology is compatible with roll-to-roll production and is an important method for industrializing perovskite cells.
Application of slot coating technology in perovskite cell production
The preparation of perovskite layers is a core step in the production process, and the quality of their film formation directly determines the conversion efficiency of the battery. Currently, the main methods for preparing perovskite layers include solution coating (wet process), vacuum vapor deposition (dry process), and vapor-assisted solution method (combined wet and dry methods).
Among them, slit coating technology in solution coating has become the preferred method for preparing perovskite layers due to its efficient and uniform coating effect.
Key points of slit coating technology
1. Precise control of coating parameters: By adjusting slit width, movement speed, and infusion speed, film quality can be finely tuned.
2. Crystallinity optimization: The good crystallinity of perovskite films helps reduce defect state density and decrease carrier recombination, thereby improving cell conversion efficiency.
3. Uniformity of large-area film formation: Slot-slit coating technology can effectively solve the uniformity problem of large-area perovskite films, improving the uniformity and quality of the coating.
Market space and industrialization prospects
With the acceleration of perovskite solar cell industrialization, market demand for slot coating equipment is also growing rapidly. It is predicted that by 2030, China's new perovskite cell capacity is expected to reach 161GW, bringing over 20 billion yuan to the perovskite coating machine market space. Currently, most companies choose the wet process for perovskite module fabrication, with slot coating technology becoming the mainstream choice due to its cost advantages and efficiency.
Slit coating technology, with its advantages in high precision, high efficiency, and high raw material utilization, is driving the industrialization of perovskite solar cells from laboratory to large-scale production. By continuously optimizing technical parameters and process flows, slit coating technology is expected to play a greater role in the future photovoltaic market, supporting the global energy transition and sustainable development.
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