TY - JOUR
T1 - Patterning of Ge2Sb2Te5 phase change material using UV nano-imprint lithography
AU - Yang, Ki Yeon
AU - Hong, Sung Hoon
AU - Kim, Deok kee
AU - Cheong, Byung ki
AU - Lee, Heon
N1 - Funding Information:
This study was supported by Consortium of Semiconductor Advanced Research Program and by a Grant (A050750) of the Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/1
Y1 - 2007/1
N2 - DRAM is the most commonly used memory due to many advantages such as high speed and easy manufacturability owing to its simple structure, but is volatile. On the other hand, flash memory is non-volatile, but has other disadvantages such as slow speed, short lifetime, and low endurance for repetitive data writing. Compared to DRAM and flash memory, PRAM (Phase-change Random Access Memory), which is a non-volatile memory using a reversible phase change between amorphous and crystalline state, has many advantages such as high speed, high sensing margin, low operating voltage, and is being pursed as a next generation memory. Being able to pattern and etch phase change memory in nanometer scale is essential for the integration of PRAM. This study uses the Nano-Imprint Lithography (NIL) for patterning the PRAM in nanometer scale which is believed to be a future lithography technology that will replace the conventional Photo Lithography. Si wafers coated with SiO2 were used as substrates, and Ge2Sb2Te5 (GST) films with the thicknesses of 100 nm were deposited by RF sputtering. Poly-benzylmethacrylate based polymer patterns were formed using NIL on the surface of GST films, and the GST films were etched using Cl2/Ar plasma in an Oxford ICP (inductively coupled plasma) etcher.
AB - DRAM is the most commonly used memory due to many advantages such as high speed and easy manufacturability owing to its simple structure, but is volatile. On the other hand, flash memory is non-volatile, but has other disadvantages such as slow speed, short lifetime, and low endurance for repetitive data writing. Compared to DRAM and flash memory, PRAM (Phase-change Random Access Memory), which is a non-volatile memory using a reversible phase change between amorphous and crystalline state, has many advantages such as high speed, high sensing margin, low operating voltage, and is being pursed as a next generation memory. Being able to pattern and etch phase change memory in nanometer scale is essential for the integration of PRAM. This study uses the Nano-Imprint Lithography (NIL) for patterning the PRAM in nanometer scale which is believed to be a future lithography technology that will replace the conventional Photo Lithography. Si wafers coated with SiO2 were used as substrates, and Ge2Sb2Te5 (GST) films with the thicknesses of 100 nm were deposited by RF sputtering. Poly-benzylmethacrylate based polymer patterns were formed using NIL on the surface of GST films, and the GST films were etched using Cl2/Ar plasma in an Oxford ICP (inductively coupled plasma) etcher.
KW - GeSbTe
KW - Nano-imprint lithography
KW - PRAM
KW - Phase change material
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U2 - 10.1016/j.mee.2006.07.004
DO - 10.1016/j.mee.2006.07.004
M3 - Article
AN - SCOPUS:33751417291
VL - 84
SP - 21
EP - 24
JO - Microelectronic Engineering
JF - Microelectronic Engineering
SN - 0167-9317
IS - 1
ER -