Effect of film thickness on the electrical properties of AlN films prepared by plasma-enhanced atomic layer deposition
Author
Altuntas, H.
Ozgit Akgun, C.
Donmez, I.
Bıyıklı, Necmi
Date
2015Source Title
IEEE Transactions on Electron Devices
Print ISSN
0018-9383
Publisher
Institute of Electrical and Electronics Engineers Inc.
Volume
62
Issue
11
Pages
3627 - 3632
Language
English
Type
ArticleItem Usage Stats
157
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Abstract
In this paper, AlN thin films with two different thicknesses, i.e., 7 and 47 nm, were deposited at 200 °C on p-type Si substrates by plasma-enhanced atomic layer deposition using trimethylaluminum and ammonia. To investigate the electrical characteristics of these AlN films, MIS capacitor structures were fabricated and characterized using current-voltage and high-frequency (1 MHz) capacitance-voltage measurements. The results showed that the current transport mechanism under accumulation mode is strongly dependent on the applied electric field and thickness of the AlN film. Possible conduction mechanisms were analyzed, and the basic electrical parameters were extracted and compared for AlN thin films with different thicknesses. Compared with 7-nm-thick film, a 47-nm-thick AlN film showed a lower effective charge density and threshold voltage along with a higher dielectric constant.
Keywords
Aluminum nitride (AlN)Current transport
Fowler-Nordheim (FN) tunneling
Frenkel-Poole (FP) emission
Plasma-enhanced atomic layer deposition (PEALD)
Trap-assisted tunneling (TAT).
Atomic layer deposition
Capacitance
Deposition
Electric fields
Threshold voltage
Accumulation modes
Capacitance voltage measurements
Conduction Mechanism
Current transport mechanism
Electrical characteristic
Electrical parameter
High frequency HF
Plasma-enhanced atomic layer deposition
Thin films
Permalink
http://hdl.handle.net/11693/20937Published Version (Please cite this version)
http://dx.doi.org/10.1109/TED.2015.2476597Collections
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