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Published on: November 28, 2017
Wafer-scale growth of MoS2 thin films by atomic layer deposition
Jung Joon Pyeon1, Soo Hyun Kim2, Doo Seok Jeong3
1Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Korea. s.k.kim@kist.re.kr and KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea.
Abstract:
The wafer-scale synthesis of MoS2 layers with precise thickness controllability and excellent uniformity is essential for their application in the nanoelectronics industry. Here, we demonstrate the atomic layer deposition (ALD) of MoS2 films with Mo(CO)6 and H2S as the Mo and S precursors, respectively. A self-limiting growth behavior is observed in the narrow ALD window of 155-175 °C. Long H2S feeding times are necessary to reduce the impurity contents in the films. The as-grown MoS2 films are amorphous due to the low growth temperature. Post-annealing at high temperatures under a H2S atmosphere efficiently improves the film properties including the crystallinity and chemical composition. An extremely uniform film growth is achieved even on a 4 inch SiO2/Si wafer. These results demonstrate that the current ALD process is well suited for the synthesis of MoS2 layers for application in industry.
