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Showing 1 to 4 of 4 for “"Negative U"”.
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Mechanism and Applications of large and persistent photoconductivity in cadmium sulfide
… semiconductors are responsible for LPPC due to negative-U behavior, whereby two minority carriers become kinetically trapped by lattice relaxation following photo-excitation. By performing a detailed analysis of photoconductivity in CdS, we provide experimental support for this negative-U model. …
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Reliability Studies of TiN/Hf-Silicate Based Gate Stacks
… shallow levels or trap-assisted tunneling due to negative- U transition occurs depending on bias condition. The former gives rise to fast transient trapping, whereas the latter is responsible for slow transient trapping. Mixed degradation, due to trapping of both electrons and holes in the trap …
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Modeling hydrogen diffusion for solar cell passivation and process optimization
… that involves shallow-level dopants and one "negative U" impurity, e.g., H. Time domain implicit method was adopted in finite difference scheme to solve the fully coupled equations. Limiting versions of the model were applied to the problems that are of interest to photovoltaics. Simplified …
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Essays on Product Placement: An Analysis of Key Executional and Individual Level Factors that Influence the Effectiveness of Product Placements.
… the nature of the product - products that had negative ethical connotations were found to be less acceptable to audiences. However, viewers who were avid consumers of entertainment media tended to have more positive attitudes. Essay 2 focuses on the effect of repetition of placements of the …