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Vol. 14 (2022)

Surface Treatment of Inorganic CsPbI3 Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

https://doi.org/10.1007/s40820-022-00813-9
Minh Tam Hoang
Faculty of Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4001, Australia
Amandeep Singh Pannu
Faculty of Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4001, Australia
Yang Yang
Faculty of Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4001, Australia
Sepideh Madani
Faculty of Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4001, Australia
Paul Shaw
Centre for Organic Photonics & Electronics (COPE), School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
Prashant Sonar
Faculty of Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4001, Australia
Tuquabo Tesfamichael
Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4001, Australia
Hongxia Wang
Faculty of Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD 4001, Australia

Corresponding Author: Hongxia Wang

hx.wang@qut.edu.au

Nano-Micro Letters, Vol. 14 (2022), Article Number: 69

Abstract

The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic material. In particular, nanocrystals (NCs) of inorganic perovskites have demonstrated excellent performance for light-emitting and display applications. However, the presence of surface defects on the NCs negatively impacts their performance in devices. Herein, we report a compatible facial post-treatment of CsPbI3 nanocrystals using guanidinium iodide (GuI). It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium cation. As a consequence, the film of treated CsPbI3 nanocrystals exhibited significantly enhanced luminescence and charge transport properties, leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8% with high brightness (peak luminance of 7039 cd m−2 and a peak current density of 10.8 cd A−1). The EQE is over threefold higher than performance of untreated device (EQE: 3.8%). The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min (at current density of 25 mA cm−2), outperforming the untreated devices (T50 ~ 6 min).


Highlights：


1 A facile and effective surface passivation strategy was demonstrated to improve the optical and stability of CsPbI3 nanocrystals by using guanidinium iodide post-treatment.
2 Guanidinium cations was shown to be compatible with CsPbI3 perovskite, leading to significantly improved surface properties of CsPbI3 nanocrystals.
3 Performance of the CsPbI3 nanocrystal-based light-emitting device was enhanced by 3.6 folds.

Keywords

CsPbI3 perovskites Nanocrystals Light-emitting diodes Photoluminescence Surface passivation Guanidinium iodide
Hoang, Minh Tam, Amandeep Singh Pannu, Yang Yang, Sepideh Madani, Paul Shaw, Prashant Sonar, Tuquabo Tesfamichael, and Hongxia Wang. 2022. “Surface Treatment of Inorganic CsPbI3 Nanocrystals With Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes With High Brightness”. Nano-Micro Letters 14 (March):69. https://doi.org/10.1007/s40820-022-00813-9.
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