Abstract
Two-step cyclic etching of copper thin films was carried out using acetylacetone/O2 gases and Ar plasma. The copper film surfaces were first modified by exposing them to acetylacetone/O2 gases and the modified layers were removed via Ar-ion sputtering. The surface modification step was optimized by varying the flow rate of the acetylacetone/O2 gases and exposure time. The removal step was optimized by varying the dc-bias voltage to the substrate as well as sputtering time. The surface modification and removal of the modified layers were confirmed by X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy. The etch per cycle was estimated to be in the range of 0.7-3.0 nm. The cyclic etching of the copper films using acetylacetone/O2 gases and Ar sputtering revealed good etch profiles with an etch slope of 70° without redepositions. It is proposed that the cyclic etching using acetylacetone/O2 gases and Ar can be a suitable method to delineate the fine patterns on copper films.
| Original language | English |
|---|---|
| Article number | 074010 |
| Journal | ECS Journal of Solid State Science and Technology |
| Volume | 12 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2023 |
Bibliographical note
Publisher Copyright:© 2023 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.