Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets

Abstract Two-dimensional (2D) ternary materials recently generated interest in optoelectronics and energy-related applications, alongside their binary counterparts. To date, only a few naturally occurring layered 2D ternary materials have been explored. The plethora of benefits owed to reduced dimen...

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Autores principales:	Mimi Liu, Cheng-Yu Lai, Meng Zhang, Daniela R. Radu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cce3e620e0a346f990b767f7840acd83
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spelling	oai:doaj.org-article:cce3e620e0a346f990b767f7840acd832021-12-02T12:33:05ZCascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets10.1038/s41598-020-78649-92045-2322https://doaj.org/article/cce3e620e0a346f990b767f7840acd832020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78649-9https://doaj.org/toc/2045-2322Abstract Two-dimensional (2D) ternary materials recently generated interest in optoelectronics and energy-related applications, alongside their binary counterparts. To date, only a few naturally occurring layered 2D ternary materials have been explored. The plethora of benefits owed to reduced dimensionality prompted exploration of expanding non-layered ternary chalcogenides into the 2D realm. This work presents a templating method that uses 2D transition metal dichalcogenides as initiators to be converted into the corresponding ternary chalcogenide upon addition of copper, via a solution-phase synthesis, conducted in high boiling point solvents. The process starts with preparation of VSe2 nanosheets, which are next converted into Cu3VSe4 sulvanite nanosheets (NSs) which retain the 2D geometry while presenting an X-ray diffraction pattern identical with the one for the bulk Cu3VSe4. Both the scanning electron microscopy and transmission microscopy electron microscopy show the presence of quasi-2D morphology. Recent studies of the sulfur-containing sulvanite Cu3VS4 highlight the presence of an intermediate bandgap, associated with enhanced photovoltaic (PV) performance. The Cu3VSe4 nanosheets reported herein exhibit multiple UV–Vis absorption peaks, related to the intermediate bandgaps similar to Cu3VS4 and Cu3VSe4 nanocrystals. To test the potential of Cu3VSe4 NSs as an absorber for solar photovoltaic devices, Cu3VSe4 NSs thin-films deposited on FTO were subjected to photoelectrochemical testing, showing p-type behavior and stable photocurrents of up to ~ 0.036 mA/cm2. The photocurrent shows a ninefold increase in comparison to reported performance of Cu3VSe4 nanocrystals. This proves that quasi-2D sulvanite nanosheets are amenable to thin-film deposition and could show superior PV performance in comparison to nanocrystal thin-films. The obtained electrical impedance spectroscopy signal of the Cu3VSe4 NSs-FTO based electrochemical cell fits an equivalent circuit with the circuit elements of solution resistance (Rs), charge-transfer resistance (Rct), double-layer capacitance (Cdl), and Warburg impedance (W). The estimated charge transfer resistance value of 300 Ω cm2 obtained from the Nyquist plot provides an insight into the rate of charge transfer on the electrode/electrolyte interface.Mimi LiuCheng-Yu LaiMeng ZhangDaniela R. RaduNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mimi Liu Cheng-Yu Lai Meng Zhang Daniela R. Radu Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets
description	Abstract Two-dimensional (2D) ternary materials recently generated interest in optoelectronics and energy-related applications, alongside their binary counterparts. To date, only a few naturally occurring layered 2D ternary materials have been explored. The plethora of benefits owed to reduced dimensionality prompted exploration of expanding non-layered ternary chalcogenides into the 2D realm. This work presents a templating method that uses 2D transition metal dichalcogenides as initiators to be converted into the corresponding ternary chalcogenide upon addition of copper, via a solution-phase synthesis, conducted in high boiling point solvents. The process starts with preparation of VSe2 nanosheets, which are next converted into Cu3VSe4 sulvanite nanosheets (NSs) which retain the 2D geometry while presenting an X-ray diffraction pattern identical with the one for the bulk Cu3VSe4. Both the scanning electron microscopy and transmission microscopy electron microscopy show the presence of quasi-2D morphology. Recent studies of the sulfur-containing sulvanite Cu3VS4 highlight the presence of an intermediate bandgap, associated with enhanced photovoltaic (PV) performance. The Cu3VSe4 nanosheets reported herein exhibit multiple UV–Vis absorption peaks, related to the intermediate bandgaps similar to Cu3VS4 and Cu3VSe4 nanocrystals. To test the potential of Cu3VSe4 NSs as an absorber for solar photovoltaic devices, Cu3VSe4 NSs thin-films deposited on FTO were subjected to photoelectrochemical testing, showing p-type behavior and stable photocurrents of up to ~ 0.036 mA/cm2. The photocurrent shows a ninefold increase in comparison to reported performance of Cu3VSe4 nanocrystals. This proves that quasi-2D sulvanite nanosheets are amenable to thin-film deposition and could show superior PV performance in comparison to nanocrystal thin-films. The obtained electrical impedance spectroscopy signal of the Cu3VSe4 NSs-FTO based electrochemical cell fits an equivalent circuit with the circuit elements of solution resistance (Rs), charge-transfer resistance (Rct), double-layer capacitance (Cdl), and Warburg impedance (W). The estimated charge transfer resistance value of 300 Ω cm2 obtained from the Nyquist plot provides an insight into the rate of charge transfer on the electrode/electrolyte interface.
format	article
author	Mimi Liu Cheng-Yu Lai Meng Zhang Daniela R. Radu
author_facet	Mimi Liu Cheng-Yu Lai Meng Zhang Daniela R. Radu
author_sort	Mimi Liu
title	Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets
title_short	Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets
title_full	Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets
title_fullStr	Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets
title_full_unstemmed	Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets
title_sort	cascade synthesis and optoelectronic applications of intermediate bandgap cu3vse4 nanosheets
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/cce3e620e0a346f990b767f7840acd83
work_keys_str_mv	AT mimiliu cascadesynthesisandoptoelectronicapplicationsofintermediatebandgapcu3vse4nanosheets AT chengyulai cascadesynthesisandoptoelectronicapplicationsofintermediatebandgapcu3vse4nanosheets AT mengzhang cascadesynthesisandoptoelectronicapplicationsofintermediatebandgapcu3vse4nanosheets AT danielarradu cascadesynthesisandoptoelectronicapplicationsofintermediatebandgapcu3vse4nanosheets
_version_	1718393885748625408

Cascade synthesis and optoelectronic applications of intermediate bandgap Cu3VSe4 nanosheets

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