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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,...
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...
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...
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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