Room Temperature Atomic Layerlike Deposition of ZnS on Organic Thin Films: Role of Substrate Functional Groups and Precursors

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Room Temperature Atomic Layerlike Deposition of ZnS on Organic Thin Films: Role of Substrate Functional Groups and Precursors

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Title: Room Temperature Atomic Layerlike Deposition of ZnS on Organic Thin Films: Role of Substrate Functional Groups and Precursors
Author(s):
Shi, Z.;
Walker, Amy V.
Item Type: article
Keywords: Show Keywords
Abstract: The room temperature atomic layerlike deposition (ALLD) of ZnS on functionalized self-assembled monolayers (SAMs) was investigated, using diethyl zinc (DEZ) and in situ generated H₂S as reactants. Depositions on SAMs with three different terminal groups, -CH₃, -OH, and -COOH, were studied. It was found that the reaction of DEZ with the SAM terminal group is critical in determining the film growth rate. Little or no deposition is observed on -CH₃ terminated SAMs because DEZ does not react with the methyl terminal group. ZnS does deposit on both -OH and -COOH terminated SAMs, but the grow rate on -COOH terminated SAMs is ∼10% lower per cycle than on -OH terminated SAMs. DEZ reacts with the hydroxyl group on -OH terminated SAMs, while on -COOH terminated SAMs it reacts with both the hydroxyl and carbonyl bonds of the terminal groups. The carbonyl reaction is found to lead to the formation of ketones rather than deposition of ZnS, lowering the growth rate on -COOH terminated SAMs. SIMS spectra show that both -OH and -COOH terminated SAMs are covered by the deposited ZnS layer after five ALLD cycles. In contrast to ZnO ALLD where the composition of the film differs for the first few layers on -COOH and -OH terminated SAMs, the deposited film composition is the same for both -COOH and -OH terminated SAMs. The deposited film is found to be Zn-rich, suggesting that the reaction of H₂S with the Zn-surface adduct may be incomplete.
Publisher: AVS Science and Technology Society
ISSN: 0734-2101
Persistent Link: http://dx.doi.org/10.1116/1.4921461
http://hdl.handle.net/10735.1/4593
Bibliographic Citation: Shi, Z., and A. V. Walker. 2015. "Room temperature atomic layerlike deposition of ZnS on organic thin films: Role of substrate functional groups and precursors." Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films 33(5) doi:10.1116/1.4921461.
Terms of Use: ©2015 American Vacuum Society
Sponsors: The authors gratefully acknowledge support from the National Science Foundation (CHE 1213546).

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