Browsing by Author "Chang, Y. L."

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Self-organized gate stack of Ge nanosphere/SiO2/Si1-xGex enables Ge-based monolithically-integrated electronics and photonics on Si platform
(2018-01-01)
Liao, P. H.
;
Kuo, M. H.
;
Tien, C. W.
;
Chang, Y. L.
;
Hong, P. Y.
We report the first-of-its-kind, self-organized gate stack of Ge nanosphere (NP) gate/SiO2/Si1-xGex channel fabricated in a single oxidation step. Process-controlled tunability of the Ge NP size (5-90nm), SiO2 thickness (2-4nm), and Ge content (x = 0.65-0.85) and strain engineering (epsilon(comp) = 1-3%) of the Si1-xGex are achieved. We demonstrated Ge junctionless (JL) n-FETs and photoMOSFETs (PTs) as amplifier and photodetector, respectively, for Ge receivers. L-G of 75nm JL n-FETs feature I-ON/I-OFF > 5x10(8), I-ON > 500 mu A/mu m at V-DS = 1V, T= 80K. Ge-PTs exhibit superior photoresponsivity > 1,000A/W and current gain linearity ranging from nW-mW for 850nm illumination. Size-tunable photo-luminescence (PL) of 300-1600nm (NUV-NIR) are observed on 5-100nm Ge NPs. Our gate stack of Ge NP/SiO2/Si1-xGex enables a practically achievable building block for monolithically-integrated Ge electronic and photonic ICs (EPICs) on Si.
Viscoelastic thin polymer films under transient residual stresses: Two-stage dewetting on soft substrates
(2008-05-02)
Al Akhrass, S.
;
Reiter, G.
;
Hou, S. Y.
;
Yang, M. H.
;
Chang, Y. L.
A nonmonotonic, two-stage dewetting behavior was observed for spin coated thin viscoelastic polymer films on soft elastic substrates. At times shorter than the relaxation time of the polymer (t tau(rep)), dewetting accelerated, accompanied by an unstable rim. However, holes nucleated at t
Waveguide based energy transfer with gold nanoclusters for detection of hydrogen peroxide
(2014)
Lin, T. N.
;
Chang, Y. L.
;
Shu, G. W.
;
Yuan, C. T.
;
Shen, J. L.
H2O2 detection that uses fluorescence resonance energy transfer from InGaN quantum wells to Au nanoclusters via optical waveguiding has been developed. Steady and time-resolved photoluminescence studies have been used to demonstrate the waveguide-based energy transfer. H2O2 detection is achieved by the quenching of the red emission from Au nanoclusters. Advantages of the sensing technique include the capability of visual detection and large area analysis.