Effective Mass-Driven Structural Transition in a Mn-Doped ZnS Nanoplatelet.
Mn doping in ZnS nanoplatelets has been shown to induce a structural transition from the wurtzite to the zinc blende phase. We trace the origin of this transition to quantum confinement effects, which shift the valence band maximum of the wurtzite and zinc blende polymorphs of ZnS at different rates as a function of the nanocrystal size, arising from different effective hole masses in the two structures. This modifies the covalency associated with Mn incorporation and is reflected in the size-dependent binding energy difference for the two structures.
†Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
Celine
C
Gerard
‡Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Center for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata-700098, India.
Ruma
R
Das
‡Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Center for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata-700098, India.
Priya
P
Mahadevan
†Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.|∥Council of Scientific and Industrial Research-Network of Institutes for Solar Energy (CSIR-NISE), New-Delhi, India.
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binding energy; nanoplatelet; structural transition