TY - JOUR UR - http://lib.ugent.be/catalog/pug01:8526451 ID - pug01:8526451 LA - eng TI - HgSe/CdE (E = S, Se) core/shell nanocrystals by colloidal atomic layer deposition PY - 2017 JO - (2017) JOURNAL OF PHYSICAL CHEMISTRY C SN - 1932-7447 PB - 2017 AU - Chiluka, Laxmi UGent 000121025684 802001424522 973457988362 0000-0002-5040-6418 AU - Walravens, Willem WE06 000080593054 802000905873 0000-0002-9980-6367 AU - Maes, Jorick WE06 000090197064 AU - Geiregat, Pieter WE06 002005073054 802000845047 0000-0001-7217-8738 AU - Hens, Zeger AB - Core/shell colloidal quantum dots (QDs) can have a more efficient photoluminescence than core-only QDs due to better surface passivation and a localization of the charge carriers in the core. Here, we demonstrate the synthesis of HgSe/CdS, HgSe/CdSe, and HgSe/CdSe/CdS core/shell QDs at room temperature by a succession of self-limiting half-reactions. A 2 detailed structural characterization through transmission electron microscopy analysis shows that shell growth happens in an additive manner. Each sequence of two half-reactions results in a approximate to 0.5 nm increase in shell thickness, meaning that approximately one monolayer is grown at the time. In all cases, shell growth eliminates the n-type doping that is intrinsic to HgSe QDs. In the case of HgSe/CdSe core/shell QDs, shell growth is strain-free as both materials have an almost identical lattice parameter. CdS shells, however, lead to the most pronounced increase of the photoluminescence quantum yield, reaching 16.5% after mild annealing for HgSe/CdS QDs emitting at around 0.69 eV (1.8 mu m). ER -Download RIS file
| 00000nam^a2200301^i^4500 | |||
| 001 | 8526451 | ||
| 005 | 20180129121216.0 | ||
| 008 | 170705s2017------------------------eng-- | ||
| 022 | a 1932-7447 | ||
| 024 | a 000404828600043 2 wos | ||
| 024 | a 1854/LU-8526451 2 handle | ||
| 024 | a 10.1021/acs.jpcc.7b02803 2 doi | ||
| 040 | a UGent | ||
| 245 | a HgSe/CdE (E = S, Se) core/shell nanocrystals by colloidal atomic layer deposition | ||
| 260 | c 2017 | ||
| 520 | a Core/shell colloidal quantum dots (QDs) can have a more efficient photoluminescence than core-only QDs due to better surface passivation and a localization of the charge carriers in the core. Here, we demonstrate the synthesis of HgSe/CdS, HgSe/CdSe, and HgSe/CdSe/CdS core/shell QDs at room temperature by a succession of self-limiting half-reactions. A 2 detailed structural characterization through transmission electron microscopy analysis shows that shell growth happens in an additive manner. Each sequence of two half-reactions results in a approximate to 0.5 nm increase in shell thickness, meaning that approximately one monolayer is grown at the time. In all cases, shell growth eliminates the n-type doping that is intrinsic to HgSe QDs. In the case of HgSe/CdSe core/shell QDs, shell growth is strain-free as both materials have an almost identical lattice parameter. CdS shells, however, lead to the most pronounced increase of the photoluminescence quantum yield, reaching 16.5% after mild annealing for HgSe/CdS QDs emitting at around 0.69 eV (1.8 mu m). | ||
| 598 | a A1 | ||
| 100 | a Chiluka, Laxmi u UGent 0 000121025684 0 802001424522 0 973457988362 0 0000-0002-5040-6418 | ||
| 700 | a Walravens, Willem u WE06 0 000080593054 0 802000905873 0 0000-0002-9980-6367 | ||
| 700 | a Maes, Jorick u WE06 0 000090197064 0 802001861931 | ||
| 700 | a Geiregat, Pieter u WE06 0 002005073054 0 802000845047 0 0000-0001-7217-8738 | ||
| 700 | a Hens, Zeger u WE06 0 801001028762 | ||
| 650 | a Chemistry | ||
| 650 | a Physics and Astronomy | ||
| 653 | a SHELL QUANTUM DOTS | ||
| 653 | a CATION-EXCHANGE | ||
| 653 | a SEMICONDUCTOR NANOCRYSTALS | ||
| 653 | a INFRARED LIGHT | ||
| 653 | a SOLAR-CELLS | ||
| 653 | a SURFACE | ||
| 653 | a TEMPERATURE | ||
| 653 | a EMISSION | ||
| 653 | a PBSE | ||
| 653 | a HETERONANOCRYSTALS | ||
| 773 | t JOURNAL OF PHYSICAL CHEMISTRY C g J. Phys. Chem. C. 2017. 121 (25) p.13816-13822 q 121:25<13816 | ||
| 856 | 3 Full Text u https://biblio.ugent.be/publication/8526451/file/8533347 z [ugent] y acs.jpcc.7b02803-2.pdf | ||
| 920 | a article | ||
| Z30 | x WE 1 WE06 | ||
| 922 | a UGENT-WE | ||
| Z30 | x WE 1 WE06* | ||
| 922 | a UGENT-WE | ||
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