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Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots

Surface passivation is an effective method to protect the surfaces and improve the luminescence properties of perovskite (PS) films. CdSe/ZnS core-shell quantum dots (QDs) have been employed for surface passivation of PS films because of their size-dependent tunable bandgaps. Herein, the energy tran...

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Autores principales: Cho, Il-Wook, Ryu, Mee-Yi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6895127/
https://www.ncbi.nlm.nih.gov/pubmed/31804551
http://dx.doi.org/10.1038/s41598-019-54860-1
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author Cho, Il-Wook
Ryu, Mee-Yi
author_facet Cho, Il-Wook
Ryu, Mee-Yi
author_sort Cho, Il-Wook
collection PubMed
description Surface passivation is an effective method to protect the surfaces and improve the luminescence properties of perovskite (PS) films. CdSe/ZnS core-shell quantum dots (QDs) have been employed for surface passivation of PS films because of their size-dependent tunable bandgaps. Herein, the energy transfer (ET) behavior of CH(3)NH(3)PbI(2)Br PS films covered with CdSe/ZnS QDs (QD/PS hybrid structures) is characterized by using photoluminescence (PL) and time-resolved PL spectroscopy. The PL decay time and the integrated PL intensity of the QD/PS hybrid structure increase compared with those of the bare PS films, owing to ET from the QDs to the PS and reduced charge traps. The ET efficiency increases from ~7% to 63% for the QD/PS hybrid structure when the core diameter of the QDs decreases from 6.5 to 2.7 nm, respectively. This can be explained by the charge transfer rate enhancement due to the control of energy level alignment of QDs. These results allow us to understand fundamental mechanisms such as ET from QDs to PS films as a function of the size of the QD.
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spelling pubmed-68951272019-12-12 Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots Cho, Il-Wook Ryu, Mee-Yi Sci Rep Article Surface passivation is an effective method to protect the surfaces and improve the luminescence properties of perovskite (PS) films. CdSe/ZnS core-shell quantum dots (QDs) have been employed for surface passivation of PS films because of their size-dependent tunable bandgaps. Herein, the energy transfer (ET) behavior of CH(3)NH(3)PbI(2)Br PS films covered with CdSe/ZnS QDs (QD/PS hybrid structures) is characterized by using photoluminescence (PL) and time-resolved PL spectroscopy. The PL decay time and the integrated PL intensity of the QD/PS hybrid structure increase compared with those of the bare PS films, owing to ET from the QDs to the PS and reduced charge traps. The ET efficiency increases from ~7% to 63% for the QD/PS hybrid structure when the core diameter of the QDs decreases from 6.5 to 2.7 nm, respectively. This can be explained by the charge transfer rate enhancement due to the control of energy level alignment of QDs. These results allow us to understand fundamental mechanisms such as ET from QDs to PS films as a function of the size of the QD. Nature Publishing Group UK 2019-12-05 /pmc/articles/PMC6895127/ /pubmed/31804551 http://dx.doi.org/10.1038/s41598-019-54860-1 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Cho, Il-Wook
Ryu, Mee-Yi
Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots
title Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots
title_full Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots
title_fullStr Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots
title_full_unstemmed Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots
title_short Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots
title_sort effect of energy transfer on the optical properties of surface-passivated perovskite films with cdse/zns quantum dots
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6895127/
https://www.ncbi.nlm.nih.gov/pubmed/31804551
http://dx.doi.org/10.1038/s41598-019-54860-1
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