Antisolvent must be dispensed on the centre of the substrate.
It may be useful to draw guides on the Spin Coater to help you hit that centre point.
Place the substrate into the Spin Coater.
Dispense the perovskite material onto the substrate before starting the spin cycle.
You may need to manually spread the solution to ensure even coverage.
Begin the first stage of the spin cycle. At this point, antisolvent can be dynamically spin coated onto the substrate.
This will control the rate of perovskite crystalisation and create a more uniform film.
It is important that the antisolvent is set centrally on the substrate and deposited in a continuous stream.
This stream should last for at least one second.
After this quench step, a change in film colour should be observed over the next few seconds.
The timing of this antisolvent quench, along with the choice and quantity of antisolvent used must be optimised for each perovskite.
After the spin cycle has stopped, the substrate must be moved to a hot plate as quickly as possible.
Here you will see the final crystalisation stage as the film changes to a fully black perovskite.