Issue 24, 2019

Enhancing the efficiency of CsPbX3 (X = Cl, Br, I) nanocrystals via simultaneous surface peeling and surface passivation

Abstract

Inorganic CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (PNCs) are promising materials for next-generation optoelectronic applications due to their tunable emission and high color purity. However, there is still room to improve their photoluminescence quantum yields (PLQYs) in order to promote their applications. Herein, the PLQY of blue light emitting CsPb(Cl/Br)3 PNCs was increased to 83% with ammonium hexafluorophosphate by choosing an appropriate treatment time. The salt peeled off the outermost surface of PNCs with halide vacancies and then passivated the surface. This method is effective at improving the PLQYs of different CsPbX3 (X = Cl, Br, I) PNCs covering the entire visible spectrum; the PLQYs were improved to 25% for CsPbCl3 at 398 nm, 83% for CsPb(Cl/Br)3 at 448 nm, 96% for CsPbBr3 at 504 nm, 86% for CsPb(Br/I)3 at 568 nm, and 98% for CsPbI3 at 687 nm.

Graphical abstract: Enhancing the efficiency of CsPbX3 (X = Cl, Br, I) nanocrystals via simultaneous surface peeling and surface passivation

Supplementary files

Article information

Article type
Communication
Submitted
30 Apr 2019
Accepted
31 May 2019
First published
03 Jun 2019

Nanoscale, 2019,11, 11464-11469

Enhancing the efficiency of CsPbX3 (X = Cl, Br, I) nanocrystals via simultaneous surface peeling and surface passivation

X. Shen, S. Wang, X. Zhang, H. Wang, X. Zhang, C. Wang, Y. Gao, Z. Shi, W. W. Yu and Y. Zhang, Nanoscale, 2019, 11, 11464 DOI: 10.1039/C9NR03679B

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