Strategy to overcome recombination limited photocurrent generation in CsPbX 3 nanocrystal arrays
Résumé
We discuss the transport properties of CsPbBrxI3x perovskite nanocrystal arrays as a model
ensemble system of caesium lead halide-based perovskite nanocrystal arrays. While this material is
very promising for the design of light emitting diodes, laser, and solar cells, very little work has
been devoted to the basic understanding of their (photo)conductive properties in an ensemble
system. By combining DC and time-resolved photocurrent measurements, we demonstrate fast
photodetection with time response below 2 ns. The photocurrent generation in perovskite
nanocrystal-based arrays is limited by fast bimolecular recombination of the material, which limits
the lifetime of the photogenerated electron-hole pairs. We propose to use nanotrench electrodes as
a strategy to ensure that the device size fits within the obtained diffusion length of the material in
order to boost the transport efficiency and thus observe an enhancement of the photoresponse by a
factor of 1000.
| Origine | Fichiers produits par l'(les) auteur(s) |
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