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author:

Wu, Huan (Wu, Huan.) [1] | Ruan, Dun-Bao (Ruan, Dun-Bao.) [2] (Scholars:阮敦宝) | Chang-Liao, Kuei-Shu (Chang-Liao, Kuei-Shu.) [3]

Indexed by:

EI Scopus SCIE

Abstract:

A HfO2/ZrO2/HfO2 (HZH) high-k stack with adequate ZrO2 thickness ratio is proposed as dielectric in metal-insulator-metal (MIM) capacitor for dynamic random access memory (DRAM) applications. The dielectric constant (k) of 43 is achieved when the ZrO2 thickness ratio is 73%. An equivalent oxide thickness (EOT) of 0.46 nm and leakage current density (J(g)) of 9.4 x 10(-5) A/cm(2) are simultaneously achieved with a total HZH physical thickness (T-ox) of 5 nm. The leakage current may be caused by the interface traps at the HZH multi-interface structure, as well as the oxygen vacancies inside HfO2 and ZrO2. To suppress J(g), a NH3 plasma treatment was in situ conducted during atomic layer deposition (ALD) processes of HZH deposition. Through nitrogen incorporation with in situ NH3 plasma treatment, the oxygen vacancies can be passivated, and Zr-O-N bonds would be formed at the interface to suppress the formation of interface traps. The sample with an in situ NH3 plasma treatment at the interface between ZrO2 and top HfO2 (ZN) can obtain a reduction in leakage current density by 48% when compared with those without ZN, while maintaining the capacitance density (C) at a similar value of around 7.4 mu F/cm(2) . The approaches of HZH stack and in situ plasma treatment for MIM capacitor are promising to the cell in DRAM technology.

Keyword:

Atomic layer deposition (ALD) dynamic random access memory (DRAM) HfO2/ZrO2/HfO2 (HZH) high-k stack in situ plasma treatment metal-insulator- metal (MIM)

Community:

  • [ 1 ] [Wu, Huan]Natl Tsing Hua Univ, Coll Semicond Res, Hsinchu 300, Taiwan
  • [ 2 ] [Chang-Liao, Kuei-Shu]Natl Tsing Hua Univ, Coll Semicond Res, Hsinchu 300, Taiwan
  • [ 3 ] [Ruan, Dun-Bao]Fuzhou Univ, Coll Phys & Informat Engn, Dept Microelect, Fuzhou 350025, Fujian, Peoples R China
  • [ 4 ] [Chang-Liao, Kuei-Shu]Natl Tsing Hua Univ, Dept Engn & Syst Sci, Hsinchu 300, Taiwan

Reprint 's Address:

  • [Chang-Liao, Kuei-Shu]Natl Tsing Hua Univ, Coll Semicond Res, Hsinchu 300, Taiwan;;[Chang-Liao, Kuei-Shu]Natl Tsing Hua Univ, Dept Engn & Syst Sci, Hsinchu 300, Taiwan;;

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Source :

IEEE TRANSACTIONS ON ELECTRON DEVICES

ISSN: 0018-9383

Year: 2024

Issue: 10

Volume: 71

Page: 6027-6031

2 . 9 0 0

JCR@2023

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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