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Published on: October 12, 2019
Charge Carrier Dynamics in Bandgap Modulated Covellite-CuS Nanostructures.
Kusuma Jagadish1, Akshath Godha1, Bidhan Pandit2
1Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India.
Transition metal doping, specifically with manganese, enhances copper sulfide (CuS) semiconductor properties by extending carrier lifetime and reducing bandgap. This optimization shows promise for advanced energy storage solutions like sodium-ion batteries.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Electrochemistry
Background:
- Copper sulfide (CuS) semiconductors are of interest for energy applications.
- The impact of transition metal doping on CuS charge carrier kinetics and bandgap is not fully understood.
Purpose of the Study:
- To investigate the effects of Nickel, Cobalt, and Manganese doping on CuS properties.
- To elucidate the mechanisms behind doping-induced alterations in charge carrier dynamics and bandgap.
- To evaluate the potential of doped CuS as cathode materials for sodium-ion batteries.
Main Methods:
- Spectroscopy
- Electrochemical analysis
- Investigation of dopant-lattice interactions in CuS
Main Results:
- Doping with transition metals (Ni, Co, Mn) alters CuS properties via sp-d exchange interactions.
- Doping reduces the bandgap, shifts band edges, and increases carrier concentration.
- Manganese-doped CuS exhibited an extended carrier lifetime (2.62 ns) compared to undoped CuS (2.16 ns), with longer scattering times and slower trapping/de-trapping rates.
Conclusions:
- Dopant-induced energy levels in CuS enhance carrier mobility and lifetime by suppressing recombination.
- Doped CuS demonstrates potential as effective cathode materials for sodium-ion batteries.
- Metal sulfides, particularly doped CuS, are applicable in developing advanced energy solutions.
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