Browsing by Author "Wu, C. I."

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Effects of electronic confinement and substrate on the low-temperature growth of Pb islands on Si(100)-2 x 1 surfaces
(2010-01-01)
Hsu, C. C.
;
Lin, W. H.
;
Ou, Y. S.
;
Su, W. B.
;
Chang, C. S.
The growth of Pb films on the Si(1 0 0)-2 x 1 surface has been investigated at low temperature using scanning tunneling microscopy Although the orientation of the substrate is (1 0 0), flat-top Pb islands with (1 1 1) surface can be observed The island thickness is confined within four to nine atomic layers at low coverage Among these islands. those with a thickness of six layers are most abundant Quantum-well states in Pb(1 1 1) islands of different thickness are acquired by scanning tunneling spectioscopy. They are found to be identical to those taken oil the Pb(1 1 1) islands grown oil the Si(1 1 1)7 x 7 surface. Besides Pb(1 1 1) islands. two additional types of Pb islands are formed. rectangular flat-top Pb(1 0 0) islands and rectangular three-dimensional (3D) Pb islands, and both their orientations rotate by 90 degrees from a terrace to the adjacent one This phenomenon implies that the structures of Pb(1 0 0) and 3D islands are influenced by the Si(1 0 0)-2 x 1 substrate (C) 2009 Elsevier B.V. All rights reserved
Investigation on residual stress and stress-optical coefficient for flexible electronics by photoelasticity
(2012-04-01)
Lee, Y. C.
;
Liu, T. S.
;
Wu, C. I.
;
Lin, W. Y.
;
機械工程學系
For flexible electronics in manufacture, the full-field stress measurement is an important issue for the film deposited on the flexible substrate. In this work, the two-dimensional photoelasticity is proposed to measure stress-optical coefficients and an analytical derivation is carried out for investigation on full-field residual stresses under tensional forces. In experimental setup, a polarization beam splitter (PBS) is used to connect with two CCD cameras that are used to capture the intensity of right-hand and left-hand circular polarization separately. It has higher measured speed and better uniformity than a direct rotation method. Stress-optical coefficients can be calculated by extracting the slope from tensional stress versus optical retardation curve. Experimental results show that optical retardations for indium-tin-oxide (ITO)-coated PET (polyethylene terephthalate) substrates can be affected more easily than PET substrates under tensional forces. The difference of stress-optical coefficients between 0 degrees and 90 degrees orientations for PEN (polyethylene naphthalate) substrates is smaller than that for PET substrates. Furthermore, it shows residual stresses for ITO-coated PET substrates in 0 degrees and 90 degrees orientations are different under tensional stress. (C) 2011 Elsevier Ltd. All rights reserved.