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The aim of the present study is to suggest two new fluids as alternatives of R12 in a vapour compression cycle. These fluids are the methyl trifluoromethyl ether (E143a) and the hexafluorocyclopropane (C216), which belong to halogenated derivatives of dimethyl ether and cyclopropane,...
We have investigated the photovoltage and photocurrent spectra of crystalline silicon/porous silicon heterojunctions. The porous silicon layers were prepared using anodic etching of p-type crystalline silicon at a current density of 25 mA/cm 2 . From the spectral dependence of the photovoltage...
In this report, a simple WO 3 dry lithiation is proposed for fabrication of all-solid-state electrochromic devices and characterized completely by X-ray photoelectron spectroscopy and electrochemical method. Lithiation is carried out by electron-beam evaporation of metal lithium, and the...
The optical properties of amorphous Ta 2 O 5 films prepared by the sol-gel dip- and spin-coating deposition technique and dried at 60°C have been investigated. Refractive index, extinction coefficient and optical energy gap have been calculated from optical transmission measurements using the...
A monolithic, three-terminal tandem structure n-ZnSe/p-ZnTe/n-CdSe was fabricated by successive epitaxial growth from the vapor phase of ZnTe and CdSe thin layers on ZnSe single crystals. At 300 K and AM1.5 the following photoelectric parameters were obtained: I sc = 4.3 mA/cm 2 , V oc = 0.98 V,...
Using the admittance analysis method, the optimal design of a single junction a-Si : H solar cell is suggested and its photovoltaic parameters are calculated. The technique is then extended to design a tandem structure of two cells stacked one on the top of the other and connected in series. The...
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