Browsing by Author "Kim, SJ"

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High-performance MIM capacitor using ALD high-k HfO2-Al2O3 laminate dielectrics
(2003-12-01)
Ding, SJ
;
Hu, H
;
Lim, HF
;
Kim, SJ
;
Yu, XF
For the first time, we successfully fabricated and demonstrated high performance metal-insulator-metal (MIM) capacitors with HfO2-Al2O3 laminate dielectric' using atomic im layer deposition (ALD) technique. Our data indicates that the laminate NUM capacitor can provide high capacitance density of 12.8 fF/ mum(2) from 10 kHz up to 20 GHz, very low leakage current of 3.2 x 10(-8) A/cm(2) at 3.3 V, small linear voltage coefficient of capacitance of 240 ppm/V together with quadratic. one of 1830 PPM/V-2, temperature coefficient of capacitance of 182 ppm/degreesC, and high breakdown field of similar to6 MV/cm as well as promising reliability. As a result, the HfO2-Al2O3 laminate is a very promising candidate for next generation MINI capacitor for radio frequency and mixed signal integrated circuit applications.
Lanthanide (Tb)-doped HfO2 for high-density MIM capacitors
(2003-07-01)
Kim, SJ
;
Cho, BJ
;
Li, MF
;
Zhu, CX
;
Chin, A
A high-density metal-insulator-metal (MIM) capacitor with a lanthanide-doped HfO2 dielectric prepared by physical vapor deposition (PVD) is presented for the first time. A significant improvement was shown in both the voltage coefficient of capacitance (VCC) and the leakage current density of MIM capacitor, yet the high capacitance density of HfO2 dielectrics was maintained by achieving the doping of Tb with an optimum concentration in HfO2. This technique allows utilizing thinner dielectric film in MIM capacitors and achieving a capacitance density as high as 13.3 fF/mum(2) with leakage current and VCC values that fully meet requirements from year 2005 for radio frequency (RF) bypass capacitors applications.
PVD HfO2 for high-precision MIM capacitor applications
(2003-06-01)
Kim, SJ
;
Cho, BJ
;
Li, MF
;
Yu, XF
;
Zhu, CX
Metal-insulator-metal (MIM) capacitors are fabricated using sputtered HfO2 with Ta and TaN for top and bottom electrodes, respectively. High-capacitance densities from 4.7 to 8.1 fF/mum(2) have been achieved while maintaining the leakage current densities around 1 x 10(-8) A/cm(2) within the normal circuit bias conditions. A guideline for the insulator thickness and its dielectric constant has been obtained by analyzing the tradeoff between the linearity coefficient and the capacitance density.
RF, DC, and reliability characteristics of ALD HfO2-Al2O3 laminate MIM capacitors for Si RF IC applications
(2004-06-01)
Ding, SJ
;
Hu, H
;
Zhu, CX
;
Kim, SJ
;
Yu, XF
High-performance metal-insulator-metal capacitors using atomic layer-deposited HfO2-Al2O3 laminate are fabricated and characterized for RF and mixed-signal applications. The laminate capacitor can offer high capacitance density (12.8 fF/mum(2)) up to 20 GHz, low leakage current of 4.9 x 10(-8) A/cm(2) at 2 V and 125 degreesC, and small linear voltage coefficient of capacitance of 211 ppm/V at 1 MHz, which can easily satisfy RF capacitor requirements for year 2007 according to the International Technology Roadmap for Semiconductors. In addition, effects of constant voltage stress and temperature on leakage current and voltage linearity are comprehensively investigated, and dependences of quadratic voltage coefficient of capacitance (alpha) on frequency and thickness are also demonstrated. Meanwhile, the underlying mechanisms are also discussed.