Role of Surface Recombination in Halide Perovskite Nanoplatelets.

Wen, X; Chen, W; Yang, J; Ou, Q; Yang, T; Zhou, C; Lin, H; Wang, Z; Zhang, Y; Conibeer, G; Bao, Q; Jia, B; Moss, DJ

Role of Surface Recombination in Halide Perovskite Nanoplatelets.

Wen, X Chen, W Yang, J Ou, Q Yang, T

Zhou, C Lin, H Wang, Z Zhang, Y Conibeer, G Bao, Q Jia, B Moss, DJ

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: ACS Appl Mater Interfaces, 2018, 10, (37), pp. 31586-31593
Issue Date:: 2018-09-19

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Field	Value	Language
dc.contributor.author	Wen, X
dc.contributor.author	Chen, W
dc.contributor.author	Yang, J
dc.contributor.author	Ou, Q
dc.contributor.author	Yang, T https://orcid.org/0000-0002-8683-2072
dc.contributor.author	Zhou, C
dc.contributor.author	Lin, H
dc.contributor.author	Wang, Z
dc.contributor.author	Zhang, Y
dc.contributor.author	Conibeer, G
dc.contributor.author	Bao, Q
dc.contributor.author	Jia, B
dc.contributor.author	Moss, DJ
dc.date.accessioned	2022-09-08T01:35:24Z
dc.date.available	2022-09-08T01:35:24Z
dc.date.issued	2018-09-19
dc.identifier.citation	ACS Appl Mater Interfaces, 2018, 10, (37), pp. 31586-31593
dc.identifier.issn	1944-8244
dc.identifier.issn	1944-8252
dc.identifier.uri	http://hdl.handle.net/10453/161511
dc.description.abstract	Halide perovskites are an extremely promising material platform for solar cells and photonic devices. The role of surface carrier recombination-well known to detrimentally affect the performance of devices-is still not well understood for thin samples where the thickness is comparable to or less than the carrier diffusion length. Here, using time-resolved microspectroscopy along with modeling, we investigate charge-carrier recombination dynamics in halide perovskite CH3NH3PbI3 nanoplatelets with thicknesses from ∼20 to 200 nm, ranging from much lesser than to comparable to the carrier diffusion length. We show that surface recombination plays a stronger role in thin perovskite nanoplatelets, significantly decreasing photoluminescence (PL) efficiency, PL decay lifetime, and photostability. Interestingly, we find that both thick and thin nanoplatelets exhibit a similar increase in PL efficiency with increasing excitation fluence, well described by our excitation saturation model. We also find that the excited carrier distribution along the depth impacts the surface recombination. Using the diffusion-surface recombination model, we determine the surface recombination velocity. This work provides a comprehensive understanding of the role of surface recombination and charge-carrier dynamics in thin perovskite platelets and reveals valuable insights useful for applications in photovoltaics and photonics.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	AMER CHEMICAL SOC
dc.relation.ispartof	ACS Appl Mater Interfaces
dc.relation.isbasedon	10.1021/acsami.8b06931
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Nanoscience & Nanotechnology
dc.title	Role of Surface Recombination in Halide Perovskite Nanoplatelets.
dc.type	Journal Article
utslib.citation.volume	10
utslib.location.activity	United States
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2022-09-08T01:35:21Z
pubs.issue	37
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	37

Abstract:

Halide perovskites are an extremely promising material platform for solar cells and photonic devices. The role of surface carrier recombination-well known to detrimentally affect the performance of devices-is still not well understood for thin samples where the thickness is comparable to or less than the carrier diffusion length. Here, using time-resolved microspectroscopy along with modeling, we investigate charge-carrier recombination dynamics in halide perovskite CH3NH3PbI3 nanoplatelets with thicknesses from ∼20 to 200 nm, ranging from much lesser than to comparable to the carrier diffusion length. We show that surface recombination plays a stronger role in thin perovskite nanoplatelets, significantly decreasing photoluminescence (PL) efficiency, PL decay lifetime, and photostability. Interestingly, we find that both thick and thin nanoplatelets exhibit a similar increase in PL efficiency with increasing excitation fluence, well described by our excitation saturation model. We also find that the excited carrier distribution along the depth impacts the surface recombination. Using the diffusion-surface recombination model, we determine the surface recombination velocity. This work provides a comprehensive understanding of the role of surface recombination and charge-carrier dynamics in thin perovskite platelets and reveals valuable insights useful for applications in photovoltaics and photonics.

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http://hdl.handle.net/10453/161511