K. J. Bachmann

Bio: K. J. Bachmann is an academic researcher. The author has contributed to research in topics: Double heterostructure & Diode. The author has an hindex of 1, co-authored 1 publications receiving 80 citations.

Efficient lattice‐matched double‐heterostructure LED’s at 1.1 μm from GaxIn1−xAsyP1−y

Abstract: The growth and operation of lattice‐matched double‐heterostructure InP/Ga0.17In0.83As0.34P0.66/InP light‐emitting diodes is reported. These diodes have an emission wavelength of 1.1 μm and quantum efficiencies of 4%.

Energy bandgap and lattice constant contours of iii–v quaternary alloys

Abstract: Energy band gap and lattice constant contours are presented for the nine quaternary alloys formed from Al, Ga, In and P, As, Sb. The quaternary bandgaps were obtained using an interpolation formula proposed by Moonet al. The quater nary lattice constants were obtained by use of a linear interpolation technique using the binary lattice constants as boundary values.

Velocity‐field characteristics of Ga1−xInxP1−yAsy quaternary alloys

Abstract: The electron drift‐velocity–electric‐field relationship has been calculated for the Ga1−xInxP1−yAsy quaternary alloy using the Monte Carlo method. Emphasis has been placed on the compositional range for which the alloy is lattice matched to GaAs and InP. These calculations suggest that this quaternary offers promise as a material for microwave semiconductor devices, including field‐effect transistors and transferred electron devices.

Low resistance ohmic contacts to n- and p-InP

Abstract: The contact properties of various metal combinations, deposited by vacuum evaporation on InP, were studied. Among these metal combinations, Au/Ge + Ni and Au/Zn proved to be most suitable. The former on n-InP (n = 8 × 1017/cm3) and the latter on p-InP (p = 9 × 1017/cm3) exhibited specific contact resistances as low as 1.2 × 10−6 and 1.1 × 10−4 Ωcm2, respectively. The specific contact resistances were analyzed using a four-point method which also accounts for the spreading resistance. Furthermore, the resistances of metal contacts to InP were calculated as a function of doping concentration and were compared with the experimental results. The described contacting technique was successfully applied to the preparation of quaternary lasers.

Composition dependence of the band gaps of In1−xGaxAs1−yPy quaternary solids lattice matched on InP substrates

Abstract: The In‐Ga‐As‐P quaternary phase diagram required for the growth of lattice‐matched In1−xGaxAs1−yPy layers on InP substrates has been determined experimentally at 650 °C. The liquidus isotherms were obtained by the seed‐dissolution technique. The solidus iostherms were determined by electron‐microprobe analysis performed on surfaces of quaternary epitaxial layers grown on Sn‐doped InP (111) B substrates from quaternary saturated melts. Lattice constants of layers were measured by an x‐ray‐diffraction technique. The liquid‐phase‐epitaxy growth conditions of lattice‐matched In1−xGaxAs1−yPy (0⩽x⩽0.47, 0⩽y⩽1.0) layers on InP were found from the results of the phase diagram and lattice constant measurements. Lattice‐matched layers with various band gaps (from 1.34 to 0.74 eV at room temperature) were grown by using these conditions. Band gaps of the layers were determined by photoluminescence measurements at 300 and 77 K. The band gap at each temperature was found to be linearly dependent on alloy‐composition p...