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A high-performance yttrium oxide film does not begin with the substrate or the reactor recipe. It begins with the precursor. If the yttrium source cannot be delivered cleanly and reproducibly, even an advanced ALD or MOCVD tool may struggle to produce uniform, low-contamination films.
Tris(methylcyclopentadienyl)yttrium(III)—commonly abbreviated as Y(MeCp)3 or (MeCp)3Y—is a gaseous yttrium precursor used for the deposition of yttrium-containing oxide thin films, representing a class of modern organoyttrium compounds of significant technical value.
Chemical name | Tris(methylcyclopentadienyl)yttrium(III) |
Common abbreviations | Y(MeCp)3; (MeCp)3Y |
CAS number | 329735-72-0 |
Molecular formula | C18H21Y |
Molecular weight | 326.27 g/mol |
Typical appearance | Yellow crystalline solid |
Purity | 99.9999%-Y |
Main deposition relevance | Yttrium precursor for Y2O3, YScO3 and YSZ-related thin films |
Sensitivity | Sensitive to moisture; should be handled under dry, inert conditions |
Typical electronic-grade delivery option | Sealed vessel or electropolished stainless steel bubbler filling |
Y(MeCp)3 contains a yttrium center coordinated by three methylcyclopentadienyl ligands. For thin-film manufacturing, this structure is valuable because the precursor must be more than a source of yttrium atoms: it must be volatilized, transported through the delivery system and introduced into the reaction chamber in a controlled manner.
The methylcyclopentadienyl ligand design gives Y(MeCp)3 useful vapor-delivery characteristics for vapor-phase deposition, making it a practical solid-source candidate for yttrium oxide film growth.
There is no universal yttrium precursor that is ideal for every deposition process. Different precursor families are selected according to volatility, thermal behavior, co-reactant compatibility, film composition, impurity requirements and tool design. Published YScO3 work, for example, used both beta-diketonate-type metal complexes and cyclopentadienyl-type organometallic compounds, showing that different precursor approaches can be useful under different process conditions. [3]
Y(MeCp)3 belongs to the cyclopentadienyl-type organoyttrium family. Its value is not that it replaces all other yttrium compounds, but that it has a clear literature basis in ALD studies. It is particularly relevant when researchers are evaluating water-based ALD routes for yttrium-containing oxide films. [2][3][4]
A key published application of Y(MeCp)3 is the atomic layer deposition of Y2O3 thin films using water as the oxygen source. In a typical ALD cycle, the yttrium precursor is pulsed into the reactor, followed by a purge step. Water is then introduced to complete the surface reaction, followed by another purge. Repeating this sequence allows Y2O3 to grow in a controlled, layer-by-layer manner. [2]
Published work on cyclopentadienyl-type yttrium precursors reported Y2O3 deposition on silicon substrates using Y(MeCp)3 and H2O. The study supports the description of Y(MeCp)3 as a documented Y(MeCp)3 ALD precursor for atomic layer deposition Y2O3 thin films, rather than as a precursor that is automatically superior to every alternative yttrium compound. [2]
For Y(MeCp)3/H2O chemistry, published studies report Y2O3 deposition in the low-to-mid hundreds of degrees Celsius, with reported processes commonly evaluated from approximately 200°C to 400°C and growth rates near 0.12 nm/cycle.
In industrial development, the useful process window should not be defined by growth rate alone. Film thickness uniformity, carbon residue, surface roughness, refractive index and electrical properties all need to be assessed before a temperature range can be considered suitable for production.
Y2O3 is one of the most direct thin-film targets for Y(MeCp)3. Yttrium oxide films are studied in dielectric, optical and protective coating contexts. ALD is attractive because it can provide precise thickness control and conformal coverage on structured surfaces. In this field, Y(MeCp)3 is relevant as one reported yttrium source for yttrium oxide film deposition on silicon and other substrates. [2]
Y(MeCp)3 has also been used in ALD studies of YScO3 thin films. YScO3 is a ternary oxide containing yttrium, scandium and oxygen, and it has been investigated as a high-permittivity material. In these processes, the yttrium and scandium precursor pulses can be adjusted to control the composition of the resulting film. [3]
Y(MeCp)3 is relevant to yttria-stabilized zirconia, or YSZ, thin-film studies as well. In ALD preparation of YSZ, Y(MeCp)3 can serve as the yttrium source, while a zirconium precursor supplies the zirconium component. By changing the Y/Zr pulse ratio, researchers can tune yttria incorporation into the zirconia matrix. Thin YSZ electrolytes are important in solid oxide fuel cell research because they can shorten ion-transport distance. [4]
Yttrium oxide is widely discussed in semiconductor etch-chamber protection because fluorine-containing plasma environments can erode chamber components and generate particles. Y2O3-based coatings are valued for their resistance to plasma-related chemical attack. Recent studies on ALD-Y2O3 films further highlight the interest in dense, uniform yttria coatings for chamber component protection. [5]
It is important to separate the coating material from the precursor route. Some plasma-resistance studies use yttrium precursors other than Y(MeCp)3. Therefore, the accurate statement is that Y(MeCp)3 is relevant to ALD-Y2O3 process development, while Y2O3 itself is the functional coating material of interest for fluorine-plasma-resistant applications. [5]
As an organometallic yttrium compound, Tris(methylcyclopentadienyl)yttrium is sensitive to air and moisture. Available SDS information classifies it as a flammable solid and notes that contact with water can release flammable gas. It should be stored in dry, tightly closed containers under inert conditions and kept away from moisture, heat and ignition sources. [1]
For R&D and electronic-grade supply, buyers should evaluate more than a single purity number. Useful information includes assay, metal-basis purity, trace-metal impurities, nonvolatile residue, packaging cleanliness and lot-to-lot consistency.
For ALD and MOCVD users, sealed ampoules or stainless steel bubblers can help reduce manual transfer and moisture exposure. A reliable Tris(methylcyclopentadienyl)yttrium manufacturer should provide lot-specific CoA, SDS and packaging support for the customer’s delivery system. [1]
Tris(methylcyclopentadienyl)yttrium is not a universal replacement for other yttrium precursors. Its real value is more specific: Y(MeCp)3 is a documented cyclopentadienyl-type organoyttrium precursor used in the development of yttrium-containing oxide thin films. It is connected to ALD research on Y2O3, YScO3 and YSZ, and it remains an important option for customers evaluating high-purity yttrium precursors for vapor-phase deposition. [2][3][4]
If you would like more information or wish to purchase Y(MeCp)3, please feel free to contact us at jomin@wolfachem.com.
Q1: Why is Tris(methylcyclopentadienyl)yttrium preferred over other yttrium precursors for ALD?
A1: Tris(methylcyclopentadienyl)yttrium, or Y(MeCp)3, is preferred because it offers practical vapor delivery and effective reactivity with H2O, enabling efficient atomic layer deposition Y2O3 thin films with good thickness control.
Q2: What are the standard purity grades available for industrial and R&D Y(MeCp)3?
A2: Common grades include research-grade Y(MeCp)3 for laboratory ALD studies and electronic grade Y(MeCp)3 for semiconductor applications, often specified by assay, metal-basis purity, trace metals and nonvolatile residue.
Q3: Is Tris(methylcyclopentadienyl)yttrium hazardous? What are its shipping regulations?
A3: Yes. Tris(methylcyclopentadienyl)yttrium(III) is moisture-sensitive and should be handled under dry inert conditions. Shipping must follow the product SDS, hazard classification and applicable chemical transport regulations.
Q4: How should a procurement manager evaluate a reliable Y(MeCp)3 manufacturer?
A4: A reliable Tris(methylcyclopentadienyl)yttrium manufacturer should provide lot-specific CoA, SDS, impurity data, stable supply capability and suitable packaging, such as sealed containers or stainless steel bubbler filling.
[1] Ereztech LLC. Safety Data Sheet: Tris(methylcyclopentadienyl)yttrium, CAS 329735-72-0.
[2] Niinistö, J.; Putkonen, M.; Niinistö, L. Processing of Y2O3 Thin Films by Atomic Layer Deposition from Cyclopentadienyl-Type Compounds and Water as Precursors. Chemistry of Materials, 2004.
[3] Myllymäki, P.; Nieminen, M.; Niinistö, J.; Putkonen, M.; Kukli, K.; Niinistö, L. High-Permittivity YScO3 Thin Films by Atomic Layer Deposition Using Two Precursor Approaches. Journal of Materials Chemistry, 2006.
[4] Shim, J. H.; Chao, C.-C.; Huang, H.; Prinz, F. B. Atomic Layer Deposition of Yttria-Stabilized Zirconia for Solid Oxide Fuel Cells. Chemistry of Materials, 2007.
[5] Lee, S.; Kim, H.; Kwon, S. Atomic Layer Deposition of Y2O3 Thin Films Using Y(MeCp)2(iPr-nPrAMD) Precursor and H2O, and Their Erosion Resistance in CF4-Based Plasma. Coatings, 2025.
