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These The paper reports a development and implementation of light trapping based on light scattering from plasmonic metal nanoparticles. The nanoparticles were formed on the surface of planar polycrystalline Si thin-film solar cells by annealing of a precursor Ag film. The light absorption by the cells and resulting photocurrent enhancement is maximised by optimising the design of the nanoparticle...
We present a novel structure of the ZnO thin-film with high haze value. The thin-film was composed by appropriate amount of ZnO nanoparticle, ZnO hollow nanoparticle and ZnO sol-gel annealed at 500??C for 1 h. Therefore, the ZnO and ZnO hollow nanoparticle can be well-bounded in the ZnO thin-film. In this experiment, the haze of novel ZnO thin films are over 80% in visible range. It will be used for...
The interfacial electron transfer and subsequent charge-recombination between single carbo-rhodamine Atto647N molecules and TiO2 nanoparticle and between single cucurbit[7]uril encapsulated Atto647N molecules and TiO2 nanoparticle are studied. Power-law distributions for the lifetimes of the dark charge-separated states are obtained. This is attributed to the broad time range taken for the injected...
An amorphous silicon suboxide was synthesized by co-sputtering of Au and SiO2 using RF magnetron sputtering. The extracted data from XRD, SEM as well as EDX were utilized to characterize the surface of the thin film samples.
For the preparation of printable devices based on ZnO nanoparticles (ZnO NP), stable colloidal dispersions of these materials are highly desirable. ZnO NP have been synthesized by chemical vapor synthesis. The particles have a spherical shape with a narrow size distribution. Stable aqueous dispersions of the ZnO NP have been successfully prepared after the addition of a polymeric stabilizer. The prepared...
In this work, we present a systematic investigation of the influence of mixed-phase TiO2 with various a-TiO2 to r-TiO2 ratio (A/R) toward the DSSCs efficiency. It was found that though a-TiO2 showed better performance than r-TiO2 in DSSCs, the Ru-bipyridine dye (N719) sensitized TiO2 films fabricated by mixed-phase TiO2 with A/R = 9 gives the highest cell efficiency.
CuSe and InSe nanoparticles were synthesized using organic solution pyrolysis route. The size and shape of nanoparticles depend on synthesis conditions such as reaction time and injecting reagent order. We achieved the synthesis of InSe nanowires with 5 nm width, 10 um length, hexagonal plate with 100 nm side and CuSe spherical nanoparticles with 20-50 nm diameter. Polycrystalline CuInSe2 film were...
Nanocrystalline (NC) semiconductor materials have previously been studied as a means of increasing the exciton multiplicity upon the impingement of visible light, for applications such as solar cells. If the multi-exciton states have highly uniform multiplicities across macroscopic NC samples, then one can also potentially quench the statistical counting noise associated with charge-carrier creation...
Electron Field Emission at atmospheric pressure from films of palladium oxide (PdO) nanoparticles is demonstrated. PdO nanoparticles with average height of 9 - 45 nm were grown on silicon substrates by oxidizing film of Pd nanoparticles. The field emission current was measured in a parallel plate diode configuration structure with 1 mum of separation between cathode and anode. The current-voltage...
Zinc oxide (ZnO) nanoparticles is an attractive candidate and gain attention for their novel properties and promising applications such as optoelectronic devices by virtue of their high surface to volume ratio and molecular absorption and desorption characteristics. Ultraviolet light emmiters, gas sensor (particularly for hydrogen) etc. are some of the potential applications of this wide direct band...
This paper reports the performance of fluorescence gas sensor to detect the presence of volatile organic compounds. Two thin films were prepared; TiO2 coated with iron (III) meso-tetraphenylporphine chloride (TiO2 coated IMTPPCl) and TiO2 coated with manganase (III) 5,10,15,20 tetra (4-pyridyl)-21 H, 23 H porphine chloride tetrakis (TiO2 coated MnTPCl). All the thin films were deposited on quartz...
A theoretical model is proposed in this work for an evaluation of the specific heat and Debye temperature of thin-film semiconductors. In the model, the specific heat contributed by the confined acoustic phonons is calculated first. An effective Debye temperature is then defined by fitting the conventional Debye model to the calculated specific heat. It is found that the so-defined Debye temperatures...
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