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

Bandgap tunable colloidal Cu-based ternary and quaternary chalcogenide nanosheets via partial cation exchange
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]
Issued Date
Article Type
Cation ExchangesColloidal SynthesisEnergy GapIn-Situ OxidationLow-Cost PhotovoltaicsNanosheetsPositive IonsQuaternary ChalcogenidesQuaternary SemiconductorsSemiconducting Selenium CompoundsSynthesis (Chemical)Ternary SemiconductorsThickness MeasurementTwo-Dimensional (2-D)
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.
Royal Society of Chemistry
Related Researcher
  • 이종수 Lee, Jong-Soo 에너지공학과
  • Research Interests Design of new type of multifunctional nanoparticles for energy-related devices; 다기능성 나노재료; 무기물 태양전지; 열전소자
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Department of Energy Science and Engineering MNEDL(Multifunctional Nanomaterials & Energy Devices Lab) 1. Journal Articles


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