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Giant Photoluminescence Enhancement in CsPbCl3 Perovskite Nanocrystals by Simultaneous Dual-Surface Passivation

Authors :
Husam N. Alshareef
Jun Pan
Osman M. Bakr
Jun Yin
Dhinesh Babu Velusamy
Mohamed N. Hedhili
Jehad K. El-Demellawi
Erkki Alarousu
Ghada H. Ahmed
Omar F. Mohammed
Source :
ACS Energy Letters. 3:2301-2307
Publication Year :
2018
Publisher :
American Chemical Society (ACS), 2018.

Abstract

The presence of localized trap states on the surface of CsPbCl3 perovskite nanocrystals (NCs) is one of the greatest challenges precluding the development of optoelectronic applications of these NCs. Passivation of these defect sites provides a promising pathway to remediating their electronic and optical properties, such as the photoluminescence quantum yield (PLQY). Herein, we demonstrate a postsynthetic dual-surface treatment using trivalent metal ion salts, i.e., YCl3, as a new passivation approach that enhances the PLQY up to 60% while preserving the NC size and crystal structure. Such remarkable enhancement of the PLQY along with prolongation of the average PL lifetimes of treated NCs samples indicates effective passivation of the surface defects and subsequent suppression of the formation of surface nonradiative recombination centers. As a segue toward optoelectronic applications, we probed the photoelectric performance of the NCs using ultraflexible devices; we found that YCl3-treated CsPbCl3 NC f...

Details

ISSN :
23808195
Volume :
3
Database :
OpenAIRE
Journal :
ACS Energy Letters
Accession number :
edsair.doi...........79898c3ea5da67a45fd05225d0f81df6
Full Text :
https://doi.org/10.1021/acsenergylett.8b01441