Study of rotary atomic layer deposition for optical applications

Leif Kochanneck; Andreas Tewes; Gerd-Albert Hoffmann; Kalle Niiranen; John Rönn; Hector Velasco; Sami Sneck; Andreas Wienke; Detlev Ristau

doi:10.1117/12.2612173

5 March 2022 Study of rotary atomic layer deposition for optical applications

Leif Kochanneck, Andreas Tewes, Gerd-Albert Hoffmann, Kalle Niiranen, John Rönn, Hector Velasco, Sami Sneck, Andreas Wienke, Detlev Ristau

Author Affiliations +

Proceedings Volume 12002, Oxide-based Materials and Devices XIII; 120020D (2022) https://doi.org/10.1117/12.2612173
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Atomic layer deposition (ALD) has been proven as an excellent method for coating high quality optical films due to its outstanding film quality and precise process control. Unfortunately, batch ALD requires time-consuming purge steps, which lead to low deposition rates and highly time-intensive processes for complex multilayer coatings. Recently, rotary ALD came in focus for optical applications. In this novel process concept, each process step takes place in a separate part of the reactor divided by pressure and nitrogen curtains. The substrates to-be-coated are rotated through these zones. During each rotation, an ALD cycle is completed, thus the deposition rate is mainly dependent on the rotation speed. In this study, the performance of a novel rotary ALD coating tool for optical applications is investigated and characterized with SiO₂ and Ta₂O₅ layers. Low absorption levels of 3.1 ppm for 200 nm thick single layer of Ta₂O₅ and 6.0 ppm for 1032 nm thick single layer of SiO₂ are demonstrated at 1064 nm, respectively, with growth rates up to 0.18 nm/s on fused silica substrates. Furthermore, excellent uniformity is also demonstrated with non-uniformity values reaching as low as 1.55 % and 2.71% for Ta₂O₅ and SiO₂, respectively, over 120 mm on silicon wafers. Seven substrates up to a diameter of 200 mm can be coated in each run. Further investigations on uniformity improvements and multilayer coatings are currently ongoing.

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Citation Download Citation

Leif Kochanneck, Andreas Tewes, Gerd-Albert Hoffmann, Kalle Niiranen, John Rönn, Hector Velasco, Sami Sneck, Andreas Wienke, and Detlev Ristau "Study of rotary atomic layer deposition for optical applications", Proc. SPIE 12002, Oxide-based Materials and Devices XIII, 120020D (5 March 2022); https://doi.org/10.1117/12.2612173

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