Heteroleptic Cyclopentadienyl-Amidinate Precursors for Atomic Layer Deposition (ALD) of Y, Pr, Gd, and Dy Oxide Thin Films

Sanni Seppälä, Jaakko Niinistö, Timothee Blanquart, Mikko Kaipio, Kenichiro Mizohata, Jyrki Räisänen, Clement Lansalot-Matras, Wontae Noh, Mikko Ritala, Markku Leskelä

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Thin films of rare-earth (RE) oxides (Y2O3, PrOx, Gd2O3, and Dy2O3) were deposited. by atomic layer deposition from liquid heteroleptic RE((PrCp)-Pr-i)(2)(Pr-i-amd) precursors with either water or ozone as the oxygen source. Film thickness, crystallinity, morphology, and composition were studied. Saturation was achieved with Gd2O3 when O-3 was used as the oxygen source at 225 degrees C and with Y2O3 with both oxygen sources at as high temperature as 350 degrees C. The growth rates were 0.90-1.3 angstrom/cycle for these processes. PrOx was challenging to deposit with both oxygen sources but with long, 20 s purges after the water pulses uniform films could be deposited. However, saturation was not achieved. With Dy2O3, uniform films could be deposited and the Dy((PrCp)-Pr-i)(2)(Pr-t-amd)/O-3 process was close to saturation at 300 degrees C. The different oxygen sources had an effect on the crystallinity and impurity contents of the films in all the studied processes. Whether ozone water was better choice for oxygen source depended on the metal oxide material that was deposited.
Original languageEnglish
JournalChemistry of Materials
Volume28
Issue number15
Pages (from-to)5440-5449
Number of pages10
ISSN0897-4756
DOIs
Publication statusPublished - 11 Jul 2016
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 116 Chemical sciences
  • 114 Physical sciences

Cite this

@article{2b7da73403174dd1bf17c1d2c4221e89,
title = "Heteroleptic Cyclopentadienyl-Amidinate Precursors for Atomic Layer Deposition (ALD) of Y, Pr, Gd, and Dy Oxide Thin Films",
abstract = "Thin films of rare-earth (RE) oxides (Y2O3, PrOx, Gd2O3, and Dy2O3) were deposited. by atomic layer deposition from liquid heteroleptic RE((PrCp)-Pr-i)(2)(Pr-i-amd) precursors with either water or ozone as the oxygen source. Film thickness, crystallinity, morphology, and composition were studied. Saturation was achieved with Gd2O3 when O-3 was used as the oxygen source at 225 degrees C and with Y2O3 with both oxygen sources at as high temperature as 350 degrees C. The growth rates were 0.90-1.3 angstrom/cycle for these processes. PrOx was challenging to deposit with both oxygen sources but with long, 20 s purges after the water pulses uniform films could be deposited. However, saturation was not achieved. With Dy2O3, uniform films could be deposited and the Dy((PrCp)-Pr-i)(2)(Pr-t-amd)/O-3 process was close to saturation at 300 degrees C. The different oxygen sources had an effect on the crystallinity and impurity contents of the films in all the studied processes. Whether ozone water was better choice for oxygen source depended on the metal oxide material that was deposited.",
keywords = "116 Chemical sciences, 114 Physical sciences",
author = "Sanni Sepp{\"a}l{\"a} and Jaakko Niinist{\"o} and Timothee Blanquart and Mikko Kaipio and Kenichiro Mizohata and Jyrki R{\"a}is{\"a}nen and Clement Lansalot-Matras and Wontae Noh and Mikko Ritala and Markku Leskel{\"a}",
year = "2016",
month = "7",
day = "11",
doi = "10.1021/acs.chemmater.6b01869",
language = "English",
volume = "28",
pages = "5440--5449",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society Journals",
number = "15",

}

Heteroleptic Cyclopentadienyl-Amidinate Precursors for Atomic Layer Deposition (ALD) of Y, Pr, Gd, and Dy Oxide Thin Films. / Seppälä, Sanni ; Niinistö, Jaakko ; Blanquart, Timothee ; Kaipio, Mikko ; Mizohata, Kenichiro; Räisänen, Jyrki ; Lansalot-Matras, Clement; Noh, Wontae; Ritala, Mikko ; Leskelä, Markku .

In: Chemistry of Materials, Vol. 28, No. 15, 11.07.2016, p. 5440-5449.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Heteroleptic Cyclopentadienyl-Amidinate Precursors for Atomic Layer Deposition (ALD) of Y, Pr, Gd, and Dy Oxide Thin Films

AU - Seppälä, Sanni

AU - Niinistö, Jaakko

AU - Blanquart, Timothee

AU - Kaipio, Mikko

AU - Mizohata, Kenichiro

AU - Räisänen, Jyrki

AU - Lansalot-Matras, Clement

AU - Noh, Wontae

AU - Ritala, Mikko

AU - Leskelä, Markku

PY - 2016/7/11

Y1 - 2016/7/11

N2 - Thin films of rare-earth (RE) oxides (Y2O3, PrOx, Gd2O3, and Dy2O3) were deposited. by atomic layer deposition from liquid heteroleptic RE((PrCp)-Pr-i)(2)(Pr-i-amd) precursors with either water or ozone as the oxygen source. Film thickness, crystallinity, morphology, and composition were studied. Saturation was achieved with Gd2O3 when O-3 was used as the oxygen source at 225 degrees C and with Y2O3 with both oxygen sources at as high temperature as 350 degrees C. The growth rates were 0.90-1.3 angstrom/cycle for these processes. PrOx was challenging to deposit with both oxygen sources but with long, 20 s purges after the water pulses uniform films could be deposited. However, saturation was not achieved. With Dy2O3, uniform films could be deposited and the Dy((PrCp)-Pr-i)(2)(Pr-t-amd)/O-3 process was close to saturation at 300 degrees C. The different oxygen sources had an effect on the crystallinity and impurity contents of the films in all the studied processes. Whether ozone water was better choice for oxygen source depended on the metal oxide material that was deposited.

AB - Thin films of rare-earth (RE) oxides (Y2O3, PrOx, Gd2O3, and Dy2O3) were deposited. by atomic layer deposition from liquid heteroleptic RE((PrCp)-Pr-i)(2)(Pr-i-amd) precursors with either water or ozone as the oxygen source. Film thickness, crystallinity, morphology, and composition were studied. Saturation was achieved with Gd2O3 when O-3 was used as the oxygen source at 225 degrees C and with Y2O3 with both oxygen sources at as high temperature as 350 degrees C. The growth rates were 0.90-1.3 angstrom/cycle for these processes. PrOx was challenging to deposit with both oxygen sources but with long, 20 s purges after the water pulses uniform films could be deposited. However, saturation was not achieved. With Dy2O3, uniform films could be deposited and the Dy((PrCp)-Pr-i)(2)(Pr-t-amd)/O-3 process was close to saturation at 300 degrees C. The different oxygen sources had an effect on the crystallinity and impurity contents of the films in all the studied processes. Whether ozone water was better choice for oxygen source depended on the metal oxide material that was deposited.

KW - 116 Chemical sciences

KW - 114 Physical sciences

U2 - 10.1021/acs.chemmater.6b01869

DO - 10.1021/acs.chemmater.6b01869

M3 - Article

VL - 28

SP - 5440

EP - 5449

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 15

ER -