Variation of poly-Si grain structures under thermal annealing and its effect on the performance of TiN/Al2O3/Si3N4/SiO2/poly-Si capacitors

Suk Bum Hong; Ju Hyun Park; Tae Ho Lee; Jun Hee Lim; Changhwan Shin; Young Woo Park; Tae Geun Kim

doi:10.1016/j.apsusc.2017.11.226

Variation of poly-Si grain structures under thermal annealing and its effect on the performance of TiN/Al₂O₃/Si₃N₄/SiO₂/poly-Si capacitors

Suk Bum Hong, Ju Hyun Park, Tae Ho Lee, Jun Hee Lim, Changhwan Shin, Young Woo Park, Tae Geun Kim

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

This study presents the improved memory properties of TiN/Al₂O₃/Si₃N₄/SiO₂/poly-Si (TANOS) capacitors after rapid thermal annealing (RTA) and high-pressure annealing processes (HPAP) using H₂ and D₂ molecules. First, it was confirmed that the recrystallization rate, and thus the grain size of the poly-silicon (poly-Si) film, increased with an increase of the RTA temperature, eventually improving the performance of the TANOS capacitor by reducing the trap densities at the poly-Si/SiO₂ interface. Then, it was found that device performance parameters, such as program/erase speed and data retention, could be further improved through HPAP owing to the passivation of band gap states at the poly-Si channel grain boundary. Finally, it was confirmed that these improvements can be observed at a transistor level in the same fashion using the Silvaco TCAD simulation.

Original language	English
Pages (from-to)	104-110
Number of pages	7
Journal	Applied Surface Science
Volume	477
DOIs	https://doi.org/10.1016/j.apsusc.2017.11.226
Publication status	Published - 2019 May 31

Keywords

Grain boundary
Interface trap
Poly-silicon channel
Rapid thermal annealing
TANOS

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2017.11.226

Cite this

Variation of poly-Si grain structures under thermal annealing and its effect on the performance of TiN/Al₂O₃/Si₃N₄/SiO₂/poly-Si capacitors. / Hong, Suk Bum; Park, Ju Hyun; Lee, Tae Ho; Lim, Jun Hee; Shin, Changhwan; Park, Young Woo; Kim, Tae Geun.

In: Applied Surface Science, Vol. 477, 31.05.2019, p. 104-110.

Research output: Contribution to journal › Article › peer-review

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title = "Variation of poly-Si grain structures under thermal annealing and its effect on the performance of TiN/Al2O3/Si3N4/SiO2/poly-Si capacitors",

abstract = "This study presents the improved memory properties of TiN/Al2O3/Si3N4/SiO2/poly-Si (TANOS) capacitors after rapid thermal annealing (RTA) and high-pressure annealing processes (HPAP) using H2 and D2 molecules. First, it was confirmed that the recrystallization rate, and thus the grain size of the poly-silicon (poly-Si) film, increased with an increase of the RTA temperature, eventually improving the performance of the TANOS capacitor by reducing the trap densities at the poly-Si/SiO2 interface. Then, it was found that device performance parameters, such as program/erase speed and data retention, could be further improved through HPAP owing to the passivation of band gap states at the poly-Si channel grain boundary. Finally, it was confirmed that these improvements can be observed at a transistor level in the same fashion using the Silvaco TCAD simulation.",

keywords = "Grain boundary, Interface trap, Poly-silicon channel, Rapid thermal annealing, TANOS",

author = "Hong, {Suk Bum} and Park, {Ju Hyun} and Lee, {Tae Ho} and Lim, {Jun Hee} and Changhwan Shin and Park, {Young Woo} and Kim, {Tae Geun}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (No. 2016R1A3B1908249), This work was also supported by Korea University Future Research Grant, and Samsung Semiconductor Research Center in Korea University. The authors would also like to thank Eugene Technology incorporation for the supply of poly-Si channel wafers. Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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AU - Lim, Jun Hee

AU - Shin, Changhwan

AU - Park, Young Woo

AU - Kim, Tae Geun

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N2 - This study presents the improved memory properties of TiN/Al2O3/Si3N4/SiO2/poly-Si (TANOS) capacitors after rapid thermal annealing (RTA) and high-pressure annealing processes (HPAP) using H2 and D2 molecules. First, it was confirmed that the recrystallization rate, and thus the grain size of the poly-silicon (poly-Si) film, increased with an increase of the RTA temperature, eventually improving the performance of the TANOS capacitor by reducing the trap densities at the poly-Si/SiO2 interface. Then, it was found that device performance parameters, such as program/erase speed and data retention, could be further improved through HPAP owing to the passivation of band gap states at the poly-Si channel grain boundary. Finally, it was confirmed that these improvements can be observed at a transistor level in the same fashion using the Silvaco TCAD simulation.

AB - This study presents the improved memory properties of TiN/Al2O3/Si3N4/SiO2/poly-Si (TANOS) capacitors after rapid thermal annealing (RTA) and high-pressure annealing processes (HPAP) using H2 and D2 molecules. First, it was confirmed that the recrystallization rate, and thus the grain size of the poly-silicon (poly-Si) film, increased with an increase of the RTA temperature, eventually improving the performance of the TANOS capacitor by reducing the trap densities at the poly-Si/SiO2 interface. Then, it was found that device performance parameters, such as program/erase speed and data retention, could be further improved through HPAP owing to the passivation of band gap states at the poly-Si channel grain boundary. Finally, it was confirmed that these improvements can be observed at a transistor level in the same fashion using the Silvaco TCAD simulation.

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