Tuning the Inter-Nanoplatelet Distance and Coupling Strength by Thermally Induced Ligand Decomposition

Shuai Chen; Samir H. Al-Hilfi; Guangbo Chen; Heng Zhang; Wenhao Zheng; Lucia Di Virgilio; Jaco J. Geuchies; Junren Wang; Xinliang Feng; Andreas Riedinger; Mischa Bonn; Hai I. Wang

doi:10.1002/smll.202308951

Tuning the Inter-Nanoplatelet Distance and Coupling Strength by Thermally Induced Ligand Decomposition

Shuai Chen, Samir H. Al-Hilfi, Guangbo Chen, Heng Zhang, Wenhao Zheng, Lucia Di Virgilio, Jaco J. Geuchies, Junren Wang, Xinliang Feng, Andreas Riedinger, Mischa Bonn, Hai I. Wang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

CdSe nanoplatelets (NPLs) are promising 2D semiconductors for optoelectronic applications, in which efficient charge transport properties are desirable. It is reported that thermal annealing constitutes an effective strategy to control the optical absorption and electrical properties of CdSe NPLs by tuning the inter-NPL distance. Combining optical absorption, transmission electron microscopy, and thermogravimetric analysis, it is revealed that the thermal decomposition of ligands (e.g., cadmium myristate) governs the inter-NPL distance and thus the inter-NPL electronic coupling strength. Employing ultrafast terahertz spectroscopy, it is shown that this enhanced electronic coupling increases both the free carrier generation efficiency and the short-range mobility in NPL solids. The results show a straightforward method of controlling the interfacial electronic coupling strength for developing functional optoelectronic devices through thermal treatments.

Original language	English
Article number	2308951
Journal	Small
Volume	20
Issue number	16
Early online date	27 Nov 2023
DOIs	https://doi.org/10.1002/smll.202308951
Publication status	Published - 18 Apr 2024

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Small published by Wiley-VCH GmbH.

Funding

The authors thank the financial support from the Max Planck Society. The authors thank Gunnar Glasser for SEM measurements. S.C. acknowledges the fellowship support from the China Scholarship Council (201804910790). J.J.G. gratefully acknowledges financial support from an Alexander von Humboldt fellowship.

Funders	Funder number
Alexander von Humboldt Stiftung
Max Planck Gesellschaft
China Scholarship Council	201804910790

Keywords

CdSe nanoplatelets
charge transport
coupling strength
thermal annealing
THz spectroscopy

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Small - 2023 - Chen - Tuning the Inter‐Nanoplatelet Distance and Coupling Strength by Thermally Induced LigandFinal published version, 1.46 MBLicence: CC BY

Cite this

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title = "Tuning the Inter-Nanoplatelet Distance and Coupling Strength by Thermally Induced Ligand Decomposition",

abstract = "CdSe nanoplatelets (NPLs) are promising 2D semiconductors for optoelectronic applications, in which efficient charge transport properties are desirable. It is reported that thermal annealing constitutes an effective strategy to control the optical absorption and electrical properties of CdSe NPLs by tuning the inter-NPL distance. Combining optical absorption, transmission electron microscopy, and thermogravimetric analysis, it is revealed that the thermal decomposition of ligands (e.g., cadmium myristate) governs the inter-NPL distance and thus the inter-NPL electronic coupling strength. Employing ultrafast terahertz spectroscopy, it is shown that this enhanced electronic coupling increases both the free carrier generation efficiency and the short-range mobility in NPL solids. The results show a straightforward method of controlling the interfacial electronic coupling strength for developing functional optoelectronic devices through thermal treatments.",

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AU - Chen, Shuai

AU - Al-Hilfi, Samir H.

AU - Chen, Guangbo

AU - Zhang, Heng

AU - Zheng, Wenhao

AU - Virgilio, Lucia Di

AU - Geuchies, Jaco J.

AU - Wang, Junren

AU - Feng, Xinliang

AU - Riedinger, Andreas

AU - Bonn, Mischa

AU - Wang, Hai I.

PY - 2024/4/18

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N2 - CdSe nanoplatelets (NPLs) are promising 2D semiconductors for optoelectronic applications, in which efficient charge transport properties are desirable. It is reported that thermal annealing constitutes an effective strategy to control the optical absorption and electrical properties of CdSe NPLs by tuning the inter-NPL distance. Combining optical absorption, transmission electron microscopy, and thermogravimetric analysis, it is revealed that the thermal decomposition of ligands (e.g., cadmium myristate) governs the inter-NPL distance and thus the inter-NPL electronic coupling strength. Employing ultrafast terahertz spectroscopy, it is shown that this enhanced electronic coupling increases both the free carrier generation efficiency and the short-range mobility in NPL solids. The results show a straightforward method of controlling the interfacial electronic coupling strength for developing functional optoelectronic devices through thermal treatments.

AB - CdSe nanoplatelets (NPLs) are promising 2D semiconductors for optoelectronic applications, in which efficient charge transport properties are desirable. It is reported that thermal annealing constitutes an effective strategy to control the optical absorption and electrical properties of CdSe NPLs by tuning the inter-NPL distance. Combining optical absorption, transmission electron microscopy, and thermogravimetric analysis, it is revealed that the thermal decomposition of ligands (e.g., cadmium myristate) governs the inter-NPL distance and thus the inter-NPL electronic coupling strength. Employing ultrafast terahertz spectroscopy, it is shown that this enhanced electronic coupling increases both the free carrier generation efficiency and the short-range mobility in NPL solids. The results show a straightforward method of controlling the interfacial electronic coupling strength for developing functional optoelectronic devices through thermal treatments.

KW - CdSe nanoplatelets

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Tuning the Inter-Nanoplatelet Distance and Coupling Strength by Thermally Induced Ligand Decomposition

Abstract

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Keywords

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