I am a new researcher currently doing experiments on perovskite solar cells.
Since I haven't got much experience in this area, I confront some questions regarding the experimental techniques.
I read the experimental sections from papers, but they usually only summarize the steps.
My questions are
1. For ETL, I use SnO2 dispered nanoparticles.
What is the difference between using IPA+DI water and using DI water only for dilution?
Do I need to stir to get rid of particles, or just sonication is enough?
Is filtration required after sonication?
2. As for the perovskite layer, I normally use FAPbI3 with small amount of MAPbr3 added.
Do I need a higher temperature or room temperature when I stir the mixture? and why?
3. For HTL, do I need to stir the mixture of spiro and chlorobenzene before adding additives and again after adding additives?
4. Lastly, does the thickness of film depend on the amount of solution dropped? What I read was it mainly depends on the rotation speed and time.
These may seem stupid questions, but I still look forward to answers..
Thank you!
A compact semiconductor layer is deposited on the FTO substrates by coating much time (sec) with annealing for some minutes
Dear Jh Kim,
To answer your question, please see the following
1. IPA +DI as solvent is better than DI water only for dispersing SnO2 nanoparticles due to the interaction on a substrate or a layer below to coat SnO2 films;
2. Don't use high temperature to stir the mixture of Perovskite layer, which could cause degradation of the materials.
3. Magnetic stirrers can be used for your mixture.
4. Make sure the amount of your solution should fully cover the whole substrate, before spin-coating procedure. You need to optimise the speed and duration for your experiment. Sevetal tests should be done before you make any devices.
Very best
Dear Jh Kim ,
welcome!
And here some additional advises:
You have to make your fabrication in a clean dry environment.
You must be sure that every layer is deposited and formed properly before depositing the next layer by testing and inspection.
It is better to measure the optical and electrical properties of the layers to be sure that they satisfy the requirements of good working solar cells.
If you make this testing routinely you will grantee good functioning solar cells systematically.
Best wishes
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