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- W3157682807 abstract "The crystal structure and shape of the CdS quantum dots (QDs) obtained by the Langmuir–Blodgett method were studied by transmission electron microscopy, extended X-ray absorption fine structure spectroscopy (EXAFS), and ultraviolet spectroscopy. X-ray photoelectron spectroscopy (XPS) and stationary photoluminescence spectroscopy (PL) methods were used to determine the dominant surface defects. Initially synthesized QDs within the Langmuir–Blodgett film of fatty behenic acid have a cubic structure and oblate spheroid shape, while free-standing QDs obtained after the matrix evaporation have a wurtzite structure and sphere-like shape. QDs within the matrix demonstrate a wide PL band centered at 2.3 eV corresponding to defect-assisted radiative recombination; after the matrix annealing and passivation of the QD surface in an ammonia atmosphere, the PL spectrum demonstrates a high-intensity band-edge peak together with a low-intensity defect-assisted shoulder. It was established that sulfur (VS) vacancies are the dominating defects. A model of simultaneous band-edge and defect-assisted recombination through the VS level was proposed." @default.
- W3157682807 created "2021-05-10" @default.
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- W3157682807 date "2021-04-29" @default.
- W3157682807 modified "2023-09-23" @default.
- W3157682807 title "Crystal Structure and Predominant Defects in CdS Quantum Dots Fabricated by the Langmuir–Blodgett Method" @default.
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- W3157682807 doi "https://doi.org/10.1021/acs.langmuir.1c00526" @default.
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