Semiconductor quantum dot–inorganic nanotube hybrids
Literature Information
Ronen Kreizman, Osip Schwartz, Zvicka Deutsch, Stella Itzhakov, Alla Zak, Sidney R. Cohen, Reshef Tenne, Dan Oron
A synthetic route for preparation of inorganic WS2 nanotube (INT)–colloidal semiconductor quantum dot (QD) hybrid structures is developed, and transient carrier dynamics on these hybrids are studied via transient photoluminescence spectroscopy utilizing several different types of QDs. Measurements reveal efficient resonant energy transfer from the QDs to the INT upon photoexcitation, provided that the QD emission is at a higher energy than the INT direct gap. Charge transfer in the hybrid system, characterized using QDs with band gaps below the INT direct gap, is found to be absent. This is attributed to the presence of an organic barrier layer due to the relatively long-chain organic ligands of the QDs under study. This system, analogous to carbon nanotube–QD hybrids, holds potential for a variety of applications, including photovoltaics, luminescence tagging and optoelectronics.
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