Improved performance of CsPbBr3 perovskite light-emitting devices by both boundary and interface defects passivation

Li Song; Xiaoyang Guo; Yongsheng Hu; Ying Lv; Jie Lin; Yi Fan; Nan Zhang; Xingyuan Liu

doi:10.1039/C8NR06311G

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Improved performance of CsPbBr₃ perovskite light-emitting devices by both boundary and interface defects passivation†

Li Song,^ab Xiaoyang Guo,

*^a Yongsheng Hu,

^a Ying Lv,

^a Jie Lin,

^a Yi Fan,^a Nan Zhang^a and Xingyuan Liu

*^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
E-mail: guoxy@ciomp.ac.cn, liuxy@ciomp.ac.cn

^b University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

Significantly enhanced luminance and current efficiency for inorganic light-emitting devices have been obtained by tetrabutylammonium bromide (TBAB) additive into perovskite precursors. Reduced nonradiative defects primarily passivated by TBAB and increased exciton binding energy are responsible for improvement of PeLED performance. By employing a TBAB-treated interfacial layer, interface defects are reduced and it results in further promotion of electroluminescence performance of PeLED, including turn-on voltage of 2.6 V, brightness as high as 67 300 cd m⁻², current efficiency of 22.5 cd A⁻¹ and external quantum efficiency of 6.28%. Our results shed light on optimization of inorganic PeLEDs by focusing on the removal of defects both at the grain boundaries and the interfaces between carrier transport layers and perovskite emitting layers.

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Article information

DOI: https://doi.org/10.1039/C8NR06311G
Article type: Paper
Submitted: 06 Aug 2018
Accepted: 10 Sep 2018
First published: 11 Sep 2018

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Nanoscale, 2018,10, 18315-18322

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Improved performance of CsPbBr₃ perovskite light-emitting devices by both boundary and interface defects passivation

L. Song, X. Guo, Y. Hu, Y. Lv, J. Lin, Y. Fan, N. Zhang and X. Liu, Nanoscale, 2018, 10, 18315 DOI: 10.1039/C8NR06311G

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