نتایج جستجو برای: surface recombination
تعداد نتایج: 680002 فیلتر نتایج به سال:
We compare the recombination properties of three important types of multicrystalline silicon wafers for solar cells, namely conventionally-solidified p-type and n-type multicrystalline wafers, and also the recently developed ‘high performance’ p-type multicrystalline wafers. Three distinct regions of the wafers are examined in detail. These are the intra-grain regions, the grain boundaries, and...
There are numerous types of Grain Boundaries (GBs) present in multicrystalline silicon wafers, such as ∑3, ∑9, ∑27 and Random Angle (RA) GBs. Small-Angle Grain Boundaries (SA GBs) are also common, and often occur in locally dense networks, creating regions of high recombination. These GBs can limit the efficiency of multicrystalline silicon solar cells, especially when they are decorated with i...
In Trypanosoma brucei, DNA recombination is crucial in antigenic variation, a strategy for evading the mammalian host immune system found in a wide variety of pathogens. T.brucei has the capacity to encode >1000 antigenically distinct variant surface glycoproteins (VSGs). By ensuring that only one VSG is expressed on the cell surface at one time, and by periodically switching the VSG gene that ...
Abstract In this article, the surface recombination rates in polycrystalline CdTe films obtained on oxidized substrates are studied. The results of corona discharge effect CdTe-SiO 2 –Si-Al structure presented. case, static mode, a shift short-circuit current spectra to short-wave region was observed. To analyze spectra, method microwave probe photoconductivity (MW-PC) used and non-contact regi...
Highly ordered TiO2 nanotube arrays are superior photoanodes for dye-sensitized solar cells (DSSCs) due to reduced intertube connections, vectorial electron transport, suppressed electron recombination, and enhanced light scattering. Performance of the cells is greatly affected by tube geometry, such as wall thickness, length, inner diameter and intertube spacing. In this paper, effect of geome...
Semiconductor-metal hybrid nanostructures are one of the best model catalysts for understanding photocatalytic hydrogen generation. To investigate the optimal structure of metal cocatalysts, metal-CdSe-metal nanodumbbells were synthesized with three distinct sets of metal tips, Pt-CdSe-Pt, Au-CdSe-Au, and Au-CdSe-Pt. Photoelectrochemical responses and transient absorption spectra showed that th...
Antigenic diversity is generated by distinct evolutionary mechanisms in African trypanosome species.
Antigenic variation enables pathogens to avoid the host immune response by continual switching of surface proteins. The protozoan blood parasite Trypanosoma brucei causes human African trypanosomiasis ("sleeping sickness") across sub-Saharan Africa and is a model system for antigenic variation, surviving by periodically replacing a monolayer of variant surface glycoproteins (VSG) that covers it...
This data article is related to our recently published article ('20.8% industrial PERC solar cell: ALD Al2O3 rear surface passivation, efficiency loss mechanisms analysis and roadmap to 24%', Huang et al., 2017 [1]) where we have presented a systematic evaluation of the overall cell processing and a cost-efficient industrial roadmap for PERC cells. Aside from the information already presented i...
DNA sequences of alleles at the merozoite surface antigen-1 (MSA-1) gene locus of the malaria parasite Plasmodium falciparum show evidence of repeated past recombination events between alleles. These include both (1) nonreciprocal recombination events that have homogenized certain gene regions among alleles and (2) reciprocal recombination events that have combined allelic segments with diverge...
Abstract In this work we investigated the adsorption of oxygen and co-adsorption hydrogen on (110) surface tungsten by means Density Functional calculations. The absorption, recombination release mechanisms across with are further established at saturation above surface. It is found that both adsorb preferentially three-fold sites. limit was determined to one monolayer in adsorbate. Oxygen lowe...
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