We discuss the transport properties of CsPbBrxI3-x 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.
Bibliographical noteFunding Information:
We acknowledge the use of clean room facilities from the consortium “Salles Blanches Paris Centre-SBPC.” This work has been supported by the Region Ile-de-France in the framework of DIM Nano-K via the grant dopQD. This work was supported by French state funds managed by the ANR within the Investissements d’Avenir program under Reference No. ANR-11-IDEX-0004-02, and more specifically within the framework of the Cluster of Excellence MATISSE. Wasim J. Mir acknowledges CEFIPRA for the Raman-Charpak fellowship and CSIR India for the Ph.D. fellowship. E.L. is thankful for the support of the ERC starting grant (project: blackQD-Grant No. 756225).
© 2018 Author(s).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)