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

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.

   • Factores importantes: forma y flujo de solución en el menisco, velocidad de secado durante y después de deposición
     • Advancing meniscus: wetting dynamics determine coating speed. Verify straight and steady wetting line! Refs 42 y 43
       • Variables claves: velocidad de wetting line y ángulo de contacto dinámico. Hallar Vcrit.
     • Receding Meniscus: its dynamics significantly influences the film quality
       • Flujos: a) Couette (en dirección al movimiento). b) Delta P entre meniscos. c) Marangoni Flow (surface tension gradients)
         • Técnicas de control: surfactantes, calentamiento sustrato
       • coating regimes
         • Evaporation: drying speed similar to coating speed. Drying in the meniscus area
           • 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
         • 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?