Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/8929
Title: Gd3+-Doped alpha-CsPbI3 nanocrystals with better phase stability and optical properties
Authors: Güvenç, Çetin Meriç
Yalçınkaya, Yenal
Özen, Sercan
Şahin, Hasan
Demir, Mustafa Muammer
Publisher: American Chemical Society
Abstract: Black alpha-CsPbI3 perovskites are unable to maintain their phase stability under room conditions; hence, the alpha-CsPbI3 phase transforms into a thermodynamically stable yellow delta-CsPbI3 phase within a few days, which has a nonperovskite structure and high band gap for optoelectronic applications. This phase transformation should be prevented or at least retarded to make use of superior properties of alpha-CsPbI3 in optoelectronic applications. In this study, Gd3+ doping was employed with the aim of increasing the stability of alpha-CsPbI3. All doped alpha-CsPbI3 nanocrystals with various levels of Gd3+, between 5 and 15 mol %, have shown greater phase stability than that of the pure alpha-CsPbI3 phase from 5 days up to 11 days under ambient conditions. This prolonged phase stability can be attributed to three potential reasons: increased tolerance factor of the perovskite structure, distorted cubic symmetry, and decreased defect density in nanocrystals. Urbach energy values suggest the reduction of defect density in the doped nanocrystals. Also, use of 10 mol % Gd3+ as a dopant material increases the photoluminescence quantum yield from 70 to 80% and fluorescence lifetime of alpha-CsPbI3 from 47.4 to 64.4 ns. Further, density functional theory calculations are in a good agreement with the experimental results.
URI: https://doi.org/10.1021/acs.jpcc.9b05969
https://hdl.handle.net/11147/8929
ISSN: 1932-7447
1932-7455
1932-7447
1932-7455
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Photonics / Fotonik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File Description SizeFormat 
acs.jpcc.9b05969.pdfMakale (Article)2.78 MBAdobe PDFThumbnail
View/Open
Show full item record



CORE Recommender

SCOPUSTM   
Citations

52
checked on Mar 22, 2024

WEB OF SCIENCETM
Citations

49
checked on Mar 27, 2024

Page view(s)

2,098
checked on Mar 25, 2024

Download(s)

98
checked on Mar 25, 2024

Google ScholarTM

Check




Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.