Wet etching of platinum (Pt) electrodes for piezoelectric transducers using a thick photoresist mask

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Date

2022-08-01

Author

Koyuncuoglu, Aziz
Akcakaya, Dilek Isik
Sukas, Ozlem Sardan
Külah, Haluk

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Platinum (Pt) is widely used in MEMS applications due to its inert nature and high temperature stability. In general, Pt is patterned using dry etching methods which require expensive machinery. In this study, we propose wet etching of Pt electrodes of piezoelectric transducers in hot Aqua Regia at 60 degrees C using a thick photoresist as a masking material. We showed that this method eliminates the need for metal hard mask and subsequent metal stripping, which may not be compatible with other structures on the process wafer. A stack of Si/Ti/Pt was used as a test sample to verify the effectiveness and chemical stability of AZ (R) 9260 and SPR (TM) 220-7 type photoresists in hot Aqua Regia. The optimized process was then successfully applied on a wafer with a pre-patterned pulsed laser deposited lead zirconate titanate (PLD-PZT) using SPR (TM) 220-7 photoresist. The suitability of the etching process was verified using optical imaging and SEM-EDS analysis. An etch resolution of 3.5 mu m was achieved for 100 nm thick Pt thin films after 15 min immersion in hot Aqua Regia at 60 degrees C without any plasma cleaning. Using descum process with Ar plasma beforehand decreased the etching time down to 3:45 min and improved the minimum feature size down to 1 mu m.

Subject Keywords

Platinum patterning, Aqua Regia, Pt-electrode, PLD-PZT, Wet etching, Thick photoresist, FILMS, METALLIZATION, FABRICATION

URI

https://hdl.handle.net/11511/101612

Journal

MICRO AND NANO ENGINEERING

DOI

https://doi.org/10.1016/j.mne.2022.100153

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

A. Koyuncuoglu, D. I. Akcakaya, O. S. Sukas, and H. Külah, “Wet etching of platinum (Pt) electrodes for piezoelectric transducers using a thick photoresist mask,” MICRO AND NANO ENGINEERING, vol. 16, pp. 0–0, 2022, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/101612.