Cited 4 time in webofscience Cited 6 time in scopus

Bandgap tunable colloidal Cu-based ternary and quaternary chalcogenide nanosheets via partial cation exchange

Title
Bandgap tunable colloidal Cu-based ternary and quaternary chalcogenide nanosheets via partial cation exchange
Authors
Ramasamy, P[Ramasamy, Parthiban]Kim, M[Kim, Miri]Ra, HS[Ra, Hyun-Soo]Kim, J[Kim, Jinkwon]Lee, JS[Lee, Jong-Soo]
DGIST Authors
Ramasamy, P[Ramasamy, Parthiban]; Ra, HS[Ra, Hyun-Soo]; Lee, JS[Lee, Jong-Soo]
Issue Date
2016
Citation
Nanoscale, 8(15), 7906-7913
Type
Article
Article Type
Article
Keywords
Cation ExchangesColloidal SynthesisEnergy GapIn-Situ OxidationLow-Cost PhotovoltaicsNanosheetsPositive IonsQuaternary ChalcogenidesQuaternary SemiconductorsSemiconducting Selenium CompoundsSynthesis (Chemical)Ternary SemiconductorsThickness MeasurementTwo-Dimensional (2-D)
ISSN
2040-3364
Abstract
Copper based ternary and quaternary semiconductor nanostructures are of great interest for the fabrication of low cost photovoltaics. Although well-developed syntheses are available for zero dimensional (0D) nanoparticles, colloidal synthesis of two dimensional (2D) nanosheets remains a big challenge. Here we report, for the first time, a simple and reproducible cation exchange approach for 2D colloidal Cu2GeSe3, Cu2ZnGeSe4 and their alloyed Cu2GeSxSe3-x, Cu2ZnGeSxSe4-x nanosheets using pre-synthesized Cu2xSe nanosheets as a template. A mechanism for the formation of Cu2-xSe nanosheets has been studied in detail. In situ oxidation of Cu+ ions to form a CuSe secondary phase facilitates the formation of Cu2-xSe NSs. The obtained ternary and quaternary nanosheets have average lateral size in micrometers and thickness less than 5 nm. This method is general and can be extended to produce other important ternary semiconductor nanosheets such as CuIn1-xGaxSe2. The optical band gap of these nanosheets is tuned from 1 to 1.48 eV, depending on their composition. © 2016 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/2570
DOI
10.1039/c5nr08666c
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Lee, Jong Soo Multifuntional Nanomaterials & Energy Devices Lab(MNEDL)
  • Research Interests
Files:
There are no files associated with this item.
Collection:
Energy Science and EngineeringMNEDL(Multifunctional Nanomaterials & Energy Devices Lab)1. Journal Articles


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