Optical Studies of CdS/CdSe/CdS and CdS/CdSe/CdMnS Core/Crown/Shell Colloidal Nanoplatelets
Jock, Jason Christopher
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Carrier-dopant exchange interactions are the defining characteristic of diluted magnetic semiconductors. Here, we report the manifestations of magneto-optical effects due to these exchange interactions, tunable through wave function engineering in colloidal CdS/CdSe/CdS and Mn 2+ doped CdS/CdSe/CdMnS core/crown/shell quantum wells. Mn 2+ doping was achieved by growing a Cd 0.98 Mn 0.02 S monolayer (ML) shell on undoped CdS/CdSe core/crown seed nanoplatelets (NPLs) by colloidal atomic layer deposition. Our colloidal nanoplatelets, which exhibit magneto-optical properties analogous to those epitaxially grown quantum wells, offer new opportunities for solution-processed spin-based semiconductor devices.