Issue 25, 2020

Zinc(ii) and cadmium(ii) complexes, [M(iPr2P(X)NC(Y)NC5H102-X,Y)2] (X and Y = O, S), as single source precursors for metal sulfide thin films

Abstract

Zinc(II) and cadmium(II) complexes of general formula [M(iPr2P(X)NC(Y)NC5H102-X,Y)2] (M = Zn, X = Y = S (4), X = S, Y = O (5), X = O, Y = S (6), and M= Cd, X = Y = S (7), X = S, Y = O (8), X = O, Y = S (9)) have been synthesized and characterized by using elemental analysis, IR and NMR spectroscopy, and thermogravimetric analysis (TGA). SCXRD molecular structures of complexes 6, 7, and 9 revealed ligand binding to the metal center in a bidentate fashion in an overall distorted tetrahedral coordination geometry. TGA showed that 4–9 decompose in a single step to their corresponding metal sulfides. Aerosol assisted chemical vapor deposition (AACVD) at 450 °C and subsequent annealing at 600 °C were used to examine 4–9 as single source precursors (SSPs) for the deposition of nanostructured metal sulfide thin films (4F–6F unannealed ZnS films and 7F–9F unannealed CdS films). GIXRD confirmed that the resultant films have a nanocrystalline hexagonal structure with the (002) preferential orientation, except for 9F, and the grain size varied from 15 to 24 nm. Scanning electron microscopy and atomic force microscopy (SEM and AFM) images revealed a relatively dense grain columnar structure. The elemental composition and mapping studies showed that the near-stoichiometric MS thin films are homogeneously distributed. The as-deposited ZnS thin films (4F–6F) displayed phosphorus content between 6.4 and 8.2%, while CdS films showed no phosphorus content except for 9F, which showed P 2%. The optical properties of the films such as direct optical energy gap (Eg), and Raman and photoluminescence (PL) spectra displayed some differences related to the employed SSP, being more significant for films obtained from precursors containing the hybrid ligand –P(O)NC(S)– (3), which showed a major phosphorus content (6F and 9F). A sharp excitonic emission at room temperature, as well as multiple Raman overtones, shows the high optical quality of the investigated CdS thin films. The PL spectra of ZnS films showed emissions attributed to the near band edge and different crystalline imperfections such as vacancies and interstitials.

Graphical abstract: Zinc(ii) and cadmium(ii) complexes, [M(iPr2P(X)NC(Y)NC5H10-κ2-X,Y)2] (X and Y = O, S), as single source precursors for metal sulfide thin films

Supplementary files

Article information

Article type
Paper
Submitted
25 Нау. 2020
Accepted
16 Мам. 2020
First published
22 Мам. 2020

New J. Chem., 2020,44, 10367-10379

Zinc(II) and cadmium(II) complexes, [M(iPr2P(X)NC(Y)NC5H102-X,Y)2] (X and Y = O, S), as single source precursors for metal sulfide thin films

V. Flores-Romero, O. L. García-Guzmán, A. Aguirre-Bautista, I. D. Rojas-Montoya, V. García-Montalvo, M. Rivera, O. Jiménez-Sandoval, M. Muñoz-Hernández and S. Hernández-Ortega, New J. Chem., 2020, 44, 10367 DOI: 10.1039/D0NJ01465F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements