Hello all,
I am currently working on Perovskite LEDs and have been selecting various layers for my device.Is there any way that I can know whether the holes and electrons are combining in the perovskite material only, and not anywhere else? Please let me know ASAP.
Thank You
Jitesh
Dear Jitesh Pandya
I am sure that this article will give you valuable information's about your request.
Kind regards
You did not mention whether it is all inorganic Perovskite or hybrid organic inorganic.
1) I will suggest to map PL to see whether it is recombining in the bulk or at the interfaces.
2) High possibilty of non radiative recombination at the interfaces. Try to minimize number of interfaces as much as possible. Focus on the band alignment.
3) Opt defect passivation strategies to minimize the non radiative recombination in the bulk if you are using high temp colloidal synthesis.
I'm guessing your question is about the radiative recombination that is the useful output of an LED. First step is to look at EL emission wavelength and see if it matches perovskite bandgap, or its PL emission. You could also vary the thickness of the ETL and HTL layers - if emission is from perovskite, thicker ETL/HTL should give same or worse luminescence, if emission increases with increasing ETL/HTL thickness, then maybe it actually comes from those layers.
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