Browsing by Author "Yu, Chih-Chieh"

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Effects of Wet Chemical and Trimethyl Aluminum Treatments on the Interface Properties in Atomic Layer Deposition of Al(2)O(3) on InAs
(2010-11-01)
Trinh, Hai-Dang
;
Chang, Edward Yi
;
Wong, Yuen-Yee
;
Yu, Chih-Chieh
;
Chang, Chia-Yuan
The reduction of native oxides on an In As surface using various wet and dry chemical treatments including hydrochloric acid (HCl) treatment sulfide treatment and in situ trimethyl aluminum (TMA) treatment before the atomic layer deposition (ALD) of Al(2)O(3) on In As is studied X ray photoelectron spectrum (XPS) results show that the effect of surface cleaning by TMA was apparent almost after the first pulse but that TMA cleaning is not as effective as wet chemical surface cleaning The combination of wet chemical treatment and TMA pretreatment is the most effective method for In As surface cleaning as indicated by the XPS analysis Capacitance-voltage (C-V) and current density-voltage (J-V) characteristics on metal-oxide-semiconductor capacitance (MOSCAP) structures were also investigated to evaluate the Al(2)O(3)/n In As interface quality after different surface treatments and the results are consistent with the XPS analysis (C) 2010 The Japan Society of Applied Physics
Effects of Wet Chemical and Trimethyl Aluminum Treatments on the Interface Properties in Atomic Layer Deposition of Al2O3 on InAs
(2010-11-01)
Trinh, Hai-Dang
;
Chang, Edward Yi
;
Wong, Yuen-Yee
;
Yu, Chih-Chieh
;
Chang, Chia-Yuan
The reduction of native oxides on an In As surface using various wet and dry chemical treatments including hydrochloric acid (HCl) treatment sulfide treatment and in situ trimethyl aluminum (TMA) treatment before the atomic layer deposition (ALD) of Al2O3 on In As is studied X ray photoelectron spectrum (XPS) results show that the effect of surface cleaning by TMA was apparent almost after the first pulse but that TMA cleaning is not as effective as wet chemical surface cleaning The combination of wet chemical treatment and TMA pretreatment is the most effective method for In As surface cleaning as indicated by the XPS analysis Capacitance-voltage (C-V) and current density-voltage (J-V) characteristics on metal-oxide-semiconductor capacitance (MOSCAP) structures were also investigated to evaluate the Al2O3/n In As interface quality after different surface treatments and the results are consistent with the XPS analysis (C) 2010 The Japan Society of Applied Physics
Highly efficient flexible inverted organic solar cells using atomic layer deposited ZnO as electron selective layer
(2010-02-07)
Wang, Jen-Chun
;
Weng, Wei-Tse
;
Tsai, Meng-Yen
;
Lee, Ming-Kun
;
Horng, Sheng-Fu
Investigation of Characteristics of Al2O3/n-In (x) Ga1-x As (x=0.53, 0.7, and 1) Metal-Oxide-Semiconductor Structures
(2013-08-01)
Trinh, Hai-Dang
;
Lin, Yueh-Chin
;
Kuo, Chien-I
;
Chang, Edward Yi
;
Hong-Quan Nguyen
The electrical properties of Al2O3/n-InGaAs metal-oxide-semiconductor capacitors (MOSCAPs) with In content of 0.53, 0.7, and 1 (InAs) have been investigated. Results show small capacitance-voltage (C-V) frequency dispersion in accumulation (1.70% to 1.85% per decade) for these MOSCAPs, mostly being assigned to border traps in Al2O3. With higher In content, shorter minority-carrier response time and smaller C-V hysteresis are observed. The reduction of C-V hysteresis might be related to the reduction of Ga-bearing oxides in Al2O3/InGaAs interfaces as indicated by x-ray photoelectron spectroscopy.
Small Conductance Calcium-Activated Potassium Current Is Important in Transmural Repolarization of Failing Human Ventricles
(2015-06-01)
Yu, Chih-Chieh
;
Corr, Christopher
;
Shen, Changyu
;
Shelton, Richard
;
Yadava, Mrinal
Background The transmural distribution of apamin-sensitive small conductance Ca2+-activated K+ (SK) current (I-KAS) in failing human ventricles remains unclear. Methods and Results We optically mapped left ventricular wedge preparations from 12 failing native hearts and 2 rejected cardiac allografts explanted during transplant surgery. We determined transmural action potential duration (APD) before and after 100 nmol/L apamin administration in all wedges and after sequential administration of apamin, chromanol, and E4031 in 4 wedges. Apamin prolonged APD from 363 ms (95% confidence interval [CI], 341-385) to 409 (95% CI, 385-434; P<0.001) in all hearts, and reduced the transmural conduction velocity from 36 cm/s (95% CI, 30-42) to 32 cm/s (95% CI, 27-37; P=0.001) in 12 native failing hearts at 1000 ms pacing cycle length (PCL). The percent APD prolongation is negatively correlated with baseline APD and positively correlated with PCL. Only 1 wedge had M-cell islands. The percentages of APD prolongation in the last 4 hearts at 2000 ms PCL after apamin, chromanol, and E4031 were 9.1% (95% CI, 3.9-14.2), 17.3% (95% CI, 3.1-31.5), and 35.9% (95% CI, 15.7-56.1), respectively. Immunohistochemical staining of subtype 2 of SK protein showed increased expression in intercalated discs of myocytes. Conclusions SK current is important in the transmural repolarization in failing human ventricles. The magnitude of I-KAS is positively correlated with the PCL, but negatively correlated with APD when PCL is fixed. There is abundant subtype 2 of SK protein in the intercalated discs of myocytes.