Abstract:
PROBLEM TO BE SOLVED: To provide a quantum dot structure in which quantum dots are distributed uniformly with high density while having a three-dimensional periodicity, and to provide a wavelength conversion element, a light-to-light converter and a photoelectric converter in which light-to-light conversion efficiency and photoelectric conversion efficiency do not decrease with time.SOLUTION: The quantum dot structure has a matrix layer, and first and second quantum dots provided in the matrix layer. The second quantum dots are arranged periodically so as to be held between the first quantum dots in the thickness direction of the matrix layer, and the first quantum dot is smaller than the second quantum dot. The first quantum dot and second quantum dot have different compositions, and the electronegativities A and B of the first and second quantum dots satisfy a relation A
Abstract:
Silicon alloys and doped silicon films are prepared by chemical vapor deposition and ion implantation processes using Si-containing chemical precursors as sources for Group III and Group V atoms. Preferred dopant precursors include (H3Si)3-xMRx, (H3Si)3N, and (H3Si)4N2, wherein R is H or D, x=0, 1 or 2, and M is selected from the group consisting of B, P, As, and Sb. Preferred deposition methods produce non-hydrogenated silicon alloy and doped Si-containing films, including crystalline films.
Abstract:
A quantum wire field-effect transistor having at least one, one-dimensional, elongate conducting means (14) provided by at least a first semiconductor layer surrounded by a wider bandgap, second semiconductor layer (12, 13) and extending between source (24) and drain (26) electrodes, and in which there is provided a backgate structure (8, 23) to control conduction in the elongate conducting means. The transistor can be a Single Electron Transistor (SET) wherein two adjacent gate electrode (16, 18) are disposed over the elongate conducting means to induce a quantum dot (17) therein, and it can be made with the first semiconductor layer material as GaAs and the second semiconductor layer material as AlGaAs. A method of making the transistor involves preferentially growing the elongate conducting means at the bottom of a groove (6) lined with second semiconductor layer (12).