Thermal ranges and figures of merit for gold-containing precursors for atomic layer deposition

This is a survey of known gold-containing chemical vapor deposition (CVD) and atomic layer deposition (ALD) precursors with a focus on collecting their volatilization and decomposition data. These data were applied to a figure of merit (sigma) developed to easily assess the thermal characteristics (volatilization temperature and the onset of decomposition]) important in the initial assessment of molecules as potential ALD precursors. Of the 46 compounds that were identified, 23 had sufficient thermal data reported in the literature to determine a sigma value. The two known gold ALD precursors (15, sigma =104 and 22, sigma =44) were both shown to be in a cluster of excellent precursors. They were each the best in their families of precursors, measured by their sigma and their onset of volatility. It was also found that many potentially excellent gold ALD precursors had gold in the +3 oxidation state. Some gold(I) compounds were identified as having good figures of merit (28, sigma =78, 29, sigma =32, 36, sigma =31), but 28 and 29 were found to undergo a reductive elimination reaction at growing gold surfaces, which is a common CVD deposition route for gold(I) compounds. beta -diketonates and beta -ketoiminates of gold were the most encouraging family of compounds, with sigma values of greater than 50. This family contained the precursor with the highest figure of merit (9, sigma =212). These compounds are difficult to make in high yield, but an alternate synthetic route that was identified during this survey might serve to make this class of gold compound competitive as a precursor.

Automated summary

This survey focuses on known gold-containing chemical vapor deposition (CVD) and atomic layer deposition (ALD) precursors, collecting data on their volatilization and decomposition. A figure of merit (sigma) is used to assess thermal characteristics, with some gold ALD precursors showing high potential. Gold(I) compounds with certain oxidation states have good figures of merit, while beta -diketonates and beta -ketoiminates of gold are particularly promising with high sigma values. A potential synthetic route for these compounds may make them competitive as precursors.