Técnicas de Menisco en celdas solares Perovskita DOI:10.1088/2631-7990/ab263e

Técnicas de Menisco en celdas solares Perovskita DOI:10.1088/2631-7990/ab263e

Anlagen:

• Scalable Fabrication and coating methods for PSC and PSM https://www.nature.com/articles/s41578-019-0176-2

1. Ventajas: efficient, low cost, high throughput film deposition technique
2. Meniscus coating can be defined as the translation of a meniscus over the surface of a substrate as the solution is spread by the coating tool.
   1. Factores importantes: forma y flujo de solución en el menisco, velocidad de secado durante y después de deposición
      1. Advancing meniscus: wetting dynamics determine coating speed. Verify straight and steady wetting line! Refs 42 y 43
         1. Variables claves: velocidad de wetting line y ángulo de contacto dinámico. Hallar Vcrit.
      2. Receding Meniscus: its dynamics significantly influences the film quality
         1. Flujos: a) Couette (en dirección al movimiento). b) Delta P entre meniscos. c) Marangoni Flow (surface tension gradients)
            1. Técnicas de control: surfactantes, calentamiento sustrato
         2. coating regimes
            1. Evaporation: drying speed similar to coating speed. Drying in the meniscus area
               1. The film thickness decreases as increasing the coating speed due to shorter residence time per unit length, leading to a reduced amount of dried material. Highly oriented films. Ejemplo: roll to roll del NREL con Ma/acn hechas por roller a 2 m/min
            2. Landau-Levich: drying slower than coating speed. wet film is formed and remains. Desde 0.6 m/min es Landau en solvente DMF. En acn es evaporation incluso a 2 m/min?