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Updated: Oct 10, 2025
Atmospheric Pressure Fabrication of Large-Sized Single-Layer Rectangular SnSe Flakes
Published on: March 21, 2018
Atomic layer deposition of SnSe thin films using Sn(N(CH3)2)4 and Se(Si(CH3)3)2 with NH3 co-injection
Jeong Woo Jeon1, Chanyoung Yoo1, Woohyun Kim1
1Department of Materials Science and Engineering and Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea. cheolsh@snu.ac.kr.
Abstract:
This study introduces the atomic layer deposition (ALD) of tin selenide thin films using Sn(N(CH3)2)4 and Se(Si(CH3)3)2 with NH3 co-injection. The co-injection of NH3 with Se(Si(CH3)3)2 is essential for film growth to convert the precursor into a more reactive form. The most critical feature of this specific ALD process is that the chemical composition (Sn/Se ratio) could be varied by changing the growth temperature, even for the given precursor injection conditions. The composition and morphology of the deposited films varied depending on the process temperature. Below 150 °C, a uniform SnSe2 thin film was deposited in an amorphous phase, maintaining the oxidation states of its precursors. Above 170 °C, the composition of the film changed to 1 : 1 stoichiometry due to the crystallization of SnSe and desorption of Se. A two-step growth sequence involving a low-temperature seed layer was devised for the high-temperature ALD of SnSe to improve surface roughness.
