Abstract: Structures and methods for controlling dopant diffusion and activation are disclosed. In one example, a semiconductor structure is disclosed. The semiconductor structure includes: a channel layer; a barrier layer over the channel layer; a gate electrode over the barrier layer; and a doped layer formed between the barrier layer and the gate electrode. The doped layer includes (a) an interface layer in contact with the barrier layer and (b) a main layer between the interface layer and the gate electrode. The doped layer comprises a dopant whose doping concentration in the interface layer is lower than that in the main layer.

Abstract: A tobacco arsenic transport gene NtNIP7-1 and a cloning method and application thereof are disclosed. A nucleotide sequence of the tobacco arsenic transport gene NtNIP7-1 is shown as SEQ ID: No. 1, and an encoded amino acid sequence thereof is shown as SEQ ID: No. 2. The cloning method of the tobacco arsenic transport gene NtNIP7-1 includes (S1) extracting RNA in tobacco, performing reverse transcription, and obtaining a first-strand cDNA; and (S2) taking the first-strand cDNA obtained by the reverse transcription as a template, synthesizing a specific primer according to sequences of the NtNIP7-1 gene, performing PCR amplification, recovering and purifying a product of the PCR amplification, and sequencing. In the present invention, inhibition of the expression of the tobacco endogenous gene NtNIP7-1 in tobacco plants is able to significantly reduce the arsenic content of tobacco leaves, and has broad application prospects in the field of low arsenic content breeding.

Abstract: A chemical vapor deposition apparatus for titanium-nitride application that is useful for preventing contaminants caused by arching between a substantially planar substrate and a substrate supporting apparatus during the deposition cycle. The apparatus includes a chemical vapor deposition chamber having a substrate-supporting heater. An annular housing supported by the heater, and a conductive strap that connectively secures the substrate-supporting heater to the annular housing by using holes instead of conventional slots. The conductive strap is designed as a flexure to flex with process temperature changes to improve electrical connectivity at its terminal connection and to prevent degradation. The annular housing has a top and a bottom surface and a cylindrical wall extending peripherally below the surfaces. The cylindrical wall encircles an isolator ring.