Dimethylamine borane oxidation for electroless deposition from alkaline solutions

Rohan, James F.; Ahern, Bernadette M.; Nagle, Lorraine C.

Dimethylamine borane oxidation for electroless deposition from alkaline solutions

Files

9414.pdf(187.79 KB)

Accepted version

Date

2006-07

Authors

Rohan, James F.

Ahern, Bernadette M.

Nagle, Lorraine C.

Publisher

Electrochemical Society

Published Version

10.1149/1.2209381

Abstract

Dimethylamine borane (DMAB) has been used as a reducing agent in electroless baths for many years. There has been an increased interest in DMAB-based electroless baths recently for applications in microelectronics such as barrier/capping layers for copper IC interconnect. To optimise the plating baths a thorough understanding of the role of each of the bath constituents is required. To this end we have employed microelectrodes to investigate the oxidation mechanism of boranes in alkaline solutions. In this paper we present data for DMAB and the simpler ammonia borane (AB) to assist in the analysis of borane oxidation in alkaline solutions. Both DMAB and AB are shown to oxidise in two steady state mass transport- controlled oxidation waves for specific concentration ranges. The potential range for oxidation, the optimum concentration and a suggested mechanism for oxidation are shown.

Keywords

Boron compounds , Electroless plating , Integrated circuits , Mass transportation , Microelectrodes , Microelectronics , Optical interconnects , Oxidation , Alkaline solutions , Ammonia borane (AB) , Borane oxidation , Capping , Plating baths

Citation

Rohan, J. F., Ahern, B. M. and Nagle, L. C. (2006) 'DMAB Oxidation for Electroless Deposition from Alkaline Solutions', ECS Transactions, 1(31), pp. 1-9. doi: 10.1149/1.2209381