Browsing by Author "Liu, PH"

Now showing 1 - 2 of 2

Emission of bright blue light from mesoporous silica with dense Si (Ge) nanocrystals
(2005)
Cho, AT
;
Shieh, JM
;
Shieh, J
;
Lai, YF
;
Dai, BT
Three-dimensional Si (Ge) nanocrystals (NCs) were dispersed within the nanopores of mesoporous silica films by high-density plasma (HDP), low-density plasma, or implantation. Surface states of the resulting Si (Ge) NCs/silica arrays initiate blue-white photoluminescence (PL). HDP makes reactive species highly mobile and enables deposited NCs bonded with pore-wall well, therefore, efficiently constructing photoemission arrays. The mean density of HDP-synthesized semiconducting NCs is as high as 1 x 10(18)/cm(3). Accordingly, blue PL of arrays obtained with HDP, which is 4- 7 times stronger than those obtained with other methods, exhibits quantum-efficiency of 1%, near the reported value for green-to-red light emission from quantum-confined Si NCs. © 2005 The Electrochemical Society. All rights reserved.
The preparation of mesoporous silica ultra-low-k film using ozone ashing treatment
(2005-07-01)
Cho, AT
;
Pan, FM
;
Chao, KJ
;
Liu, PH
;
Chen, JY
The ozone ash treatment has been demonstrated to effectively remove the organic template at 200-300 degrees C as well as to enhance the mechanical strength of mesoporous silica films. The resulting films are of ordered pore structure, strong mechanical strength, and smooth surface. After reacting with hexamethyidisilazane, the silica film has been modified to hydrophobic from hydrophilic and exhibits an ultra-low dielectric constant (k <= 2) and a low leakage current density (10(-7) A/cm(2)) with good electrical reliability. (c) 2005 Elsevier B.V. All rights reserved.