Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
Skip to main content
  • Having developed a unique new type of photovoltaic modules (powder-based), performed pioneering research in solar hyd... moreedit
ABSTRACT ZnO thin films with electrical resistance as low as 10-3 (Omega) (DOT)cm and transparency of 90 - 95% have been prepared by spray pyrolysis of zinc acetate solutions. However, a careful optimization of all deposition conditions... more
ABSTRACT ZnO thin films with electrical resistance as low as 10-3 (Omega) (DOT)cm and transparency of 90 - 95% have been prepared by spray pyrolysis of zinc acetate solutions. However, a careful optimization of all deposition conditions is needed in order to obtain films with these values. Thermal decomposition of precursor, the influence of preparation conditions on the film properties and on the film formation mechanism are studied. The stepwise thermal destruction of Zn(CH3CO2)2(DOT)2H2O is recorded and it is shown, that single solid phase ZnO is the only decomposition product at temperatures higher than 590 K in air. Three characteristic temperature regions were distinguished in the film growth process exhibiting each a different mechanism of crystal growth and leading to different thin film qualities. The optical, structural, morphological and electrical properties of sprayed films are mainly determined by growth temperature and are in dependence on the concentration of dopants. This can be explained on the basis of changes in the growth mechanisms and chemical purity of the films.
ABSTRACT The possibility is demonstrated to manufacture by the recrystallization of initial powders in different molten fluxes different A2B6 powders with the qualities acceptable for monograin layer construction. Several technologies of... more
ABSTRACT The possibility is demonstrated to manufacture by the recrystallization of initial powders in different molten fluxes different A2B6 powders with the qualities acceptable for monograin layer construction. Several technologies of formation of monograin layers and optoelectronic devices were developed and studied. It is shown, that insufficient electronic parameters of semiconductor sensors and solar cells designed as monograin layers are connected with the insufficient cleaning of surfaces of crystals in the monograin layer.
Acknowledgment. W e thank CAICYT for financial support and dedicate this work to Prof. F. GonzBlez-Garcia on his 70th birthday. Registry No. Pyrophyllite, 12269-78-2; muscovite, 1318-94-1; mar-garite, 1318-86-1; talc, 14807-96-6;... more
Acknowledgment. W e thank CAICYT for financial support and dedicate this work to Prof. F. GonzBlez-Garcia on his 70th birthday. Registry No. Pyrophyllite, 12269-78-2; muscovite, 1318-94-1; mar-garite, 1318-86-1; talc, 14807-96-6; phylogopite, 61076-94-6; vermiculite,
... AC CE PT ED M AN US CR IPT ACCEPTED MANUSCRIPT 1 Study of Cu2ZnSnSe4 monograin formation in molten KI starting from binary chalcogenides Inga Klavina1, Tiit Kaljuvee2, Kristi Timmo1, Jaan Raudoja1, Rainer Traksmaa3, Mare ... [9] AJ... more
... AC CE PT ED M AN US CR IPT ACCEPTED MANUSCRIPT 1 Study of Cu2ZnSnSe4 monograin formation in molten KI starting from binary chalcogenides Inga Klavina1, Tiit Kaljuvee2, Kristi Timmo1, Jaan Raudoja1, Rainer Traksmaa3, Mare ... [9] AJ Smith, PE Meek, WY Liang, J ...
In this work maximum concentrations of the impurities hydrogen chloride and hydrogen sulfide in synthetic wood gas for operation of a solid oxide fuel cell (SOFC) at different working temperatures and flow conditions are reported.... more
In this work maximum concentrations of the impurities hydrogen chloride and hydrogen sulfide in synthetic wood gas for operation of a solid oxide fuel cell (SOFC) at different working temperatures and flow conditions are reported. Additionally, an analysis of the influence of the impurity concentrations during the heating up and cooling down phases of the SOFC is given. The paper also deals with wood gas which is generated by a fluidized bed steam gasifier or made by air gasification. It was found that operation with up to 50 ppm hydrogen chloride in hydrogen was possible. Also stable cell performances could be observed with the combination of 10 ppm hydrogen chloride and 3 ppm hydrogen sulfide in the fuel. Wood gas from air gasification always lead to a stable performance but wood gas from steam gasifier sometimes caused power degradation.
Research Interests:
The effect of fullerene (C 60 ) doping on photoelectric conversion using titanyl phthalocyanine (TiOPc) and a perylene pigment, N, N′-dimethyl-3,4 : 9,10-perylenebis(dicarboximide) (MPCI), was investigated. A new three-layer cell,... more
The effect of fullerene (C 60 ) doping on photoelectric conversion using titanyl phthalocyanine (TiOPc) and a perylene pigment, N, N′-dimethyl-3,4 : 9,10-perylenebis(dicarboximide) (MPCI), was investigated. A new three-layer cell, ITO/MPCI/C 60 -doped TiOPc/TiOPc/Au, ...
We report electroabsorption (EA) studies of electric fields in bilayer molecular organic solar cells made from zinc phthalocyanine (ZnPc) and a methyl substituted perylene pigment (MPP). We have detected an electric field at the... more
We report electroabsorption (EA) studies of electric fields in bilayer molecular organic solar cells made from zinc phthalocyanine (ZnPc) and a methyl substituted perylene pigment (MPP). We have detected an electric field at the metal/organic interface which is sensitive to the external DC bias. The interface field has a different spectral signature from that of the bulk of the two layers, which we attribute to interface species such as charge transfer-induced dipoles. The electric field is proportional to the applied bias in devices containing ...
In this study Cu-phthalocyanine (CuPc) films have been investigated by scanning tunneling microscopy to get quantitative insight into the morphology of the films from the micrometer range down to nanometer resolution to see the... more
In this study Cu-phthalocyanine (CuPc) films have been investigated by scanning tunneling microscopy to get quantitative insight into the morphology of the films from the micrometer range down to nanometer resolution to see the arrangement of the molecules. The molecules on the ...
A first investigation of the electrochemical double layer in the tunneling gap between a WSe 2 semiconductor electrode and a Pt:Ir STM tip was performed by current–distance spectroscopy. The magnitude of the current between tip and... more
A first investigation of the electrochemical double layer in the tunneling gap between a WSe 2 semiconductor electrode and a Pt:Ir STM tip was performed by current–distance spectroscopy. The magnitude of the current between tip and semiconductor depends ...
3034 WILEY-VCH Verlag GmbH, D-69451 Weinheim, 1998 1433-7851/98/3721-3034 $ 17.50+.50/0 Angew. Chem. Int. Ed. 1998, 37, No. 21 ... Modified, Amorphous Titania–A Hybrid Semiconductor for Detoxification and Current Generation by Visible... more
3034 WILEY-VCH Verlag GmbH, D-69451 Weinheim, 1998 1433-7851/98/3721-3034 $ 17.50+.50/0 Angew. Chem. Int. Ed. 1998, 37, No. 21 ... Modified, Amorphous Titania–A Hybrid Semiconductor for Detoxification and Current Generation by Visible Light**