In present paper is reported the first successful observation of the electrochromic effect of polyvanadium- molybdenum acid H2V10Mo2O31+/- y(DOT)nH2O xerogels. Thin films of the investigated compound were produced by sol-gel technology. The transmission spectra were measured in the visible and infrared wavelength range. IN the all wavelength regions the transmission spectra changes when the dc electrical field was applied to the film. IN the visible wavelength range were observed the reversible changes of the film color. IR spectroscopy measurements of the films were carried out to obtain information about the water content in the film when the current flows through the sample. The electrochromic effect in the investigated compound is related with the proton motion through the xerogel that is acting by dc electrical field.
The in-plane electron mobility limited by the interaction of the degenerate electron gas with the confined LO-phonons is investigated in the extreme quantum limit. The layered structures PbTe/PbSnTe with axes < 111 > are considered. A square quantum well approximation is assumed for the calculations. The influence of Kane's two-band energetic structure of the electrons is taken into account. It is shown that the manifestations of the non-parabolicity of the electron energy dispersion law in quantum size case are twofold: (a) as a bulk-like non-parabolicity, considerably reducing the calculated mobility, (b) as effective mass quantization whose influence on the mobility arises at small quantum well width.
The second harmonic generation due to the intersubband transitions in the doubly resonant nonparobolic quantum well systems is discussed theoretically, employing the self- consistent field method. It was shown that the correct description of the modification of the second-harmonic generation spectrum resulting from the nonparabolicity of the subbands have to take into account the depolarization effect.
Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR) have been used to characterize porous silicon layers (PSL) exposed to HF destructive etching. The results obtained lend support to the view that chemical passivation, in particular by oxygen, is the major factor which controls the origin of PL. The PL intensity and the PL shift are ascribed to the changes in hydrogen and oxygen termination of pores.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.