期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 551, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2020.120434
关键词
Hydrogenated amorphous silicon carbonitride; PECVD; Low temperature deposition; Optical properties; Transparent thin-films; Chemical composition
资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [UID/CTM/04540/2019, PTDC/NAN-OPT/31311/2017]
- project IPL IDICA 2019 Mo-TFT
a-SiCN:H thin films were deposited at 150 degrees C by PECVD using silane, methane, and ammonia as precursor gases, with a SiH4:H-2 dilution of 1:9. Material composition was determined using RBS and ERDA, with an analysis of precursor gas concentration and bonding energies. Optical properties and chemical composition were related, showing a trade-off between optical gap and refractive index for potential applications in optical devices.
a-SiCN:H thin films were deposited at 150 degrees C by PECVD using silane, methane and ammonia as precursor gases, with a SiH4:H-2 dilution of 1:9. RBS and ERDA were used for determining material composition. The con-centration of silicon, carbon and nitrogen in the deposited films was correlated with the respective precursor gas concentration and the incorporation yield of each atomic species was determined and related to the molecular bond energies of precursor gases. Chemical bonding type and density determined by FTIR were also related to the chemical composition of the films. Optical transmission was measured to estimate the optical gap (E-op) and refractive index (n) in the transparent region. Stoichiometric a-SiN has the lowest n (1.74) and highest E-op (4.12 eV) while a-Si:H presents the highest n (3.37) and lowest E-op (1.85 eV). A trade-off between the E-op and n is presented to show the applicability of this ternary material in optical devices.
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