Tetrakis(diethylamino)hafnium — TDEAH

SAFC Hitech® Tetrakis(diethylamino)hafnium is available in a wide range of ultra-high purity grades and is supplied to customers worldwide through our network of local distribution facilities.

To accommodate the range of customer requirements, SAFC Hitech has invested in production and filling facilities capable of handling a wide variety of different containers, specializing in fill quantities between 25g and 25kg. Customer specific containers and fill requests can also be considered.

Hafnium diethylamide
HFDEA
TDEAH
Hf(NEt2)4
Hf(N(C2H5)2)4

Tetrakis(diethylamino)hafnium (TDEAH) is used as a hafnium source for the deposition of HfO2 dielectric layers. Hafnium oxide is a leading candidate to replace silicon dioxide as the gate oxide in metal oxide semiconductor field effect transistors (MOSFET)[1]. The thin film properties which make HfO2 an attractive prospect for a gate oxide replacement also make it a potential insulating dielectric in the capacitive elements in memory devices such as DRAM[2].

TDEAH can be used for conventional CVD for the deposition of HfO2[3] and with Si alkylamides affords HfSiO2[4]. However, TDEAH also deposits HfO2 via atomic layer deposition (ALD) in a self-limiting process[5]. ALD deposits smooth, conformal layers with the additional benefit of precise thickness control, thus TDEAH is an ideal choice for the deposition of high aspect ratio device architectures currently employed.

The volatility and thermal stability of the source is such that TDEAH can be transported from a bubbler in conventional CVD/ALD systems[6]. Additionally it can be prepared as a solution for use in liquid injection systems.

In all applications, contamination is a key factor and research work at SAFC Hitech has been successful in developing purification routes to remove metallic and organic impurities. Product is certified according to the specification.

SAFC Hitech have installed the latest technologies in process equipment design and operational control to yield efficient and reliable production facilities for Tetrakis(diethylamino)hafnium. Multiple production locations and appropriate modular systems ensure an uninterrupted supply of TDEAH globally. SAFC Hitech is basic in TDEAH manufacturing with capabilities to produce high purity raw materials, control contamination sources and minimize impurity levels in the final product. Furthermore, SAFC Hitech employs specially developed purification processes for TDEAH that provide the lowest levels of metallic and hydrocarbon impurity levels on a consistent basis.

Tetrakis(diethylamino) hafnium is certified in-house using the latest analytical techniques, and film growth ensures the validity of the methods and that the TDEAH is capable of producing high quality films for state-of-the-art device fabrication.

SAFC Hitech employs the latest analytical techniques with ultra-low detection limits for all the potential contaminants in Tetrakis(diethylamino)hafnium. TDEAH is sampled and analyzed during and post manufacture to ensure the highest final product specification and reliability. The analysis is performed using a wide variety of physical characterization techniques including ICP-OES, ICP-MS, NMR, TGA, vapour pressure, GC-AED and AA, on state-of-the-art tools specially upgraded for TDEAH impurity detection.

Considerable effort has been expended to develop suitable methodologies to provide accurate, reproducible data for the different grades of product available. As for many of its manufactured products, SAFC Hitech regularly reviews the analytical data it collects and can provide SPQ data to its customers.